diff --git a/hyracks-algebricks/hyracks-algebricks-common/pom.xml b/hyracks-algebricks/hyracks-algebricks-common/pom.xml
new file mode 100644
index 0000000..5996eda
--- /dev/null
+++ b/hyracks-algebricks/hyracks-algebricks-common/pom.xml
@@ -0,0 +1,31 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <artifactId>hyracks-algebricks-common</artifactId>
+
+  <parent>
+    <groupId>edu.uci.ics.hyracks</groupId>
+    <artifactId>hyracks-algebricks</artifactId>
+    <version>0.2.1-SNAPSHOT</version>
+  </parent>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>2.0.2</version>
+        <configuration>
+          <source>1.6</source>
+          <target>1.6</target>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+  <dependencies>
+  <dependency>
+  	<groupId>edu.uci.ics.hyracks</groupId>
+  	<artifactId>hyracks-api</artifactId>
+  	<version>0.2.1-SNAPSHOT</version>
+  </dependency>
+  </dependencies>
+</project>
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/api/constraints/AlgebricksAbsolutePartitionConstraint.java b/hyracks-algebricks/hyracks-algebricks-common/src/main/java/edu/uci/ics/hyracks/algebricks/common/constraints/AlgebricksAbsolutePartitionConstraint.java
similarity index 94%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/api/constraints/AlgebricksAbsolutePartitionConstraint.java
rename to hyracks-algebricks/hyracks-algebricks-common/src/main/java/edu/uci/ics/hyracks/algebricks/common/constraints/AlgebricksAbsolutePartitionConstraint.java
index de5f778..924d85b 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/api/constraints/AlgebricksAbsolutePartitionConstraint.java
+++ b/hyracks-algebricks/hyracks-algebricks-common/src/main/java/edu/uci/ics/hyracks/algebricks/common/constraints/AlgebricksAbsolutePartitionConstraint.java
@@ -12,7 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.api.constraints;
+package edu.uci.ics.hyracks.algebricks.common.constraints;
 
 public class AlgebricksAbsolutePartitionConstraint extends AlgebricksPartitionConstraint {
     private final String[] locations;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/api/constraints/AlgebricksCountPartitionConstraint.java b/hyracks-algebricks/hyracks-algebricks-common/src/main/java/edu/uci/ics/hyracks/algebricks/common/constraints/AlgebricksCountPartitionConstraint.java
similarity index 94%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/api/constraints/AlgebricksCountPartitionConstraint.java
rename to hyracks-algebricks/hyracks-algebricks-common/src/main/java/edu/uci/ics/hyracks/algebricks/common/constraints/AlgebricksCountPartitionConstraint.java
index 9cd8079..99091aa 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/api/constraints/AlgebricksCountPartitionConstraint.java
+++ b/hyracks-algebricks/hyracks-algebricks-common/src/main/java/edu/uci/ics/hyracks/algebricks/common/constraints/AlgebricksCountPartitionConstraint.java
@@ -12,7 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.api.constraints;
+package edu.uci.ics.hyracks.algebricks.common.constraints;
 
 public class AlgebricksCountPartitionConstraint extends AlgebricksPartitionConstraint {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/api/constraints/AlgebricksPartitionConstraint.java b/hyracks-algebricks/hyracks-algebricks-common/src/main/java/edu/uci/ics/hyracks/algebricks/common/constraints/AlgebricksPartitionConstraint.java
similarity index 92%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/api/constraints/AlgebricksPartitionConstraint.java
rename to hyracks-algebricks/hyracks-algebricks-common/src/main/java/edu/uci/ics/hyracks/algebricks/common/constraints/AlgebricksPartitionConstraint.java
index 0a63b80..929479c 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/api/constraints/AlgebricksPartitionConstraint.java
+++ b/hyracks-algebricks/hyracks-algebricks-common/src/main/java/edu/uci/ics/hyracks/algebricks/common/constraints/AlgebricksPartitionConstraint.java
@@ -12,7 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.api.constraints;
+package edu.uci.ics.hyracks.algebricks.common.constraints;
 
 public abstract class AlgebricksPartitionConstraint {
     public enum PartitionConstraintType {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/api/constraints/AlgebricksPartitionConstraintHelper.java b/hyracks-algebricks/hyracks-algebricks-common/src/main/java/edu/uci/ics/hyracks/algebricks/common/constraints/AlgebricksPartitionConstraintHelper.java
similarity index 97%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/api/constraints/AlgebricksPartitionConstraintHelper.java
rename to hyracks-algebricks/hyracks-algebricks-common/src/main/java/edu/uci/ics/hyracks/algebricks/common/constraints/AlgebricksPartitionConstraintHelper.java
index e64602b..54cdb59 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/api/constraints/AlgebricksPartitionConstraintHelper.java
+++ b/hyracks-algebricks/hyracks-algebricks-common/src/main/java/edu/uci/ics/hyracks/algebricks/common/constraints/AlgebricksPartitionConstraintHelper.java
@@ -12,7 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.api.constraints;
+package edu.uci.ics.hyracks.algebricks.common.constraints;
 
 import edu.uci.ics.hyracks.api.constraints.PartitionConstraintHelper;
 import edu.uci.ics.hyracks.api.dataflow.IOperatorDescriptor;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/api/exceptions/AlgebricksException.java b/hyracks-algebricks/hyracks-algebricks-common/src/main/java/edu/uci/ics/hyracks/algebricks/common/exceptions/AlgebricksException.java
similarity index 94%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/api/exceptions/AlgebricksException.java
rename to hyracks-algebricks/hyracks-algebricks-common/src/main/java/edu/uci/ics/hyracks/algebricks/common/exceptions/AlgebricksException.java
index c852ecd..b55a4b3 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/api/exceptions/AlgebricksException.java
+++ b/hyracks-algebricks/hyracks-algebricks-common/src/main/java/edu/uci/ics/hyracks/algebricks/common/exceptions/AlgebricksException.java
@@ -12,7 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.api.exceptions;
+package edu.uci.ics.hyracks.algebricks.common.exceptions;
 
 public class AlgebricksException extends Exception {
     private static final long serialVersionUID = 1L;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/api/exceptions/NotImplementedException.java b/hyracks-algebricks/hyracks-algebricks-common/src/main/java/edu/uci/ics/hyracks/algebricks/common/exceptions/NotImplementedException.java
similarity index 94%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/api/exceptions/NotImplementedException.java
rename to hyracks-algebricks/hyracks-algebricks-common/src/main/java/edu/uci/ics/hyracks/algebricks/common/exceptions/NotImplementedException.java
index f5343a8..cb9e054 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/api/exceptions/NotImplementedException.java
+++ b/hyracks-algebricks/hyracks-algebricks-common/src/main/java/edu/uci/ics/hyracks/algebricks/common/exceptions/NotImplementedException.java
@@ -12,7 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.api.exceptions;
+package edu.uci.ics.hyracks.algebricks.common.exceptions;
 
 public class NotImplementedException extends RuntimeException {
     private static final long serialVersionUID = 2L;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/utils/ListSet.java b/hyracks-algebricks/hyracks-algebricks-common/src/main/java/edu/uci/ics/hyracks/algebricks/common/utils/ListSet.java
similarity index 97%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/utils/ListSet.java
rename to hyracks-algebricks/hyracks-algebricks-common/src/main/java/edu/uci/ics/hyracks/algebricks/common/utils/ListSet.java
index 44f948f..acf1e6f 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/utils/ListSet.java
+++ b/hyracks-algebricks/hyracks-algebricks-common/src/main/java/edu/uci/ics/hyracks/algebricks/common/utils/ListSet.java
@@ -1,4 +1,4 @@
-package edu.uci.ics.hyracks.algebricks.core.utils;
+package edu.uci.ics.hyracks.algebricks.common.utils;
 
 import java.util.ArrayList;
 import java.util.Collection;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/utils/Pair.java b/hyracks-algebricks/hyracks-algebricks-common/src/main/java/edu/uci/ics/hyracks/algebricks/common/utils/Pair.java
similarity index 95%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/utils/Pair.java
rename to hyracks-algebricks/hyracks-algebricks-common/src/main/java/edu/uci/ics/hyracks/algebricks/common/utils/Pair.java
index d3aff9f..ddd56da 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/utils/Pair.java
+++ b/hyracks-algebricks/hyracks-algebricks-common/src/main/java/edu/uci/ics/hyracks/algebricks/common/utils/Pair.java
@@ -12,7 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.utils;
+package edu.uci.ics.hyracks.algebricks.common.utils;
 
 import java.io.Serializable;
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/utils/Triple.java b/hyracks-algebricks/hyracks-algebricks-common/src/main/java/edu/uci/ics/hyracks/algebricks/common/utils/Triple.java
similarity index 96%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/utils/Triple.java
rename to hyracks-algebricks/hyracks-algebricks-common/src/main/java/edu/uci/ics/hyracks/algebricks/common/utils/Triple.java
index ad76ef1..0361152 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/utils/Triple.java
+++ b/hyracks-algebricks/hyracks-algebricks-common/src/main/java/edu/uci/ics/hyracks/algebricks/common/utils/Triple.java
@@ -12,7 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.utils;
+package edu.uci.ics.hyracks.algebricks.common.utils;
 
 public class Triple<T1, T2, T3> {
     public T1 first;
diff --git a/hyracks-algebricks/hyracks-algebricks-compiler/src/main/java/edu/uci/ics/hyracks/algebricks/compiler/api/AbstractCompilerFactoryBuilder.java b/hyracks-algebricks/hyracks-algebricks-compiler/src/main/java/edu/uci/ics/hyracks/algebricks/compiler/api/AbstractCompilerFactoryBuilder.java
index 276398d..f0fbe5e 100644
--- a/hyracks-algebricks/hyracks-algebricks-compiler/src/main/java/edu/uci/ics/hyracks/algebricks/compiler/api/AbstractCompilerFactoryBuilder.java
+++ b/hyracks-algebricks/hyracks-algebricks-compiler/src/main/java/edu/uci/ics/hyracks/algebricks/compiler/api/AbstractCompilerFactoryBuilder.java
@@ -16,25 +16,25 @@
 
 import java.util.List;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IBinaryBooleanInspector;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IBinaryComparatorFactoryProvider;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IBinaryHashFunctionFactoryProvider;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IBinaryIntegerInspector;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.INormalizedKeyComputerFactoryProvider;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IPrinterFactoryProvider;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.ISerializerDeserializerProvider;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.ITypeTraitProvider;
+import edu.uci.ics.hyracks.algebricks.common.constraints.AlgebricksPartitionConstraint;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IExpressionEvalSizeComputer;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IExpressionTypeComputer;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.ILogicalExpressionJobGen;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IMergeAggregationExpressionFactory;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.INullableTypeComputer;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IPartialAggregationTypeComputer;
-import edu.uci.ics.hyracks.algebricks.core.api.constraints.AlgebricksPartitionConstraint;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.AbstractRuleController;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.PhysicalOptimizationConfig;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.data.IBinaryBooleanInspector;
+import edu.uci.ics.hyracks.algebricks.data.IBinaryComparatorFactoryProvider;
+import edu.uci.ics.hyracks.algebricks.data.IBinaryHashFunctionFactoryProvider;
+import edu.uci.ics.hyracks.algebricks.data.IBinaryIntegerInspector;
+import edu.uci.ics.hyracks.algebricks.data.INormalizedKeyComputerFactoryProvider;
+import edu.uci.ics.hyracks.algebricks.data.IPrinterFactoryProvider;
+import edu.uci.ics.hyracks.algebricks.data.ISerializerDeserializerProvider;
+import edu.uci.ics.hyracks.algebricks.data.ITypeTraitProvider;
 import edu.uci.ics.hyracks.api.dataflow.value.INullWriterFactory;
 
 public abstract class AbstractCompilerFactoryBuilder {
diff --git a/hyracks-algebricks/hyracks-algebricks-compiler/src/main/java/edu/uci/ics/hyracks/algebricks/compiler/api/HeuristicCompilerFactoryBuilder.java b/hyracks-algebricks/hyracks-algebricks-compiler/src/main/java/edu/uci/ics/hyracks/algebricks/compiler/api/HeuristicCompilerFactoryBuilder.java
index 9245772..235f439 100644
--- a/hyracks-algebricks/hyracks-algebricks-compiler/src/main/java/edu/uci/ics/hyracks/algebricks/compiler/api/HeuristicCompilerFactoryBuilder.java
+++ b/hyracks-algebricks/hyracks-algebricks-compiler/src/main/java/edu/uci/ics/hyracks/algebricks/compiler/api/HeuristicCompilerFactoryBuilder.java
@@ -14,6 +14,7 @@
  */
 package edu.uci.ics.hyracks.algebricks.compiler.api;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IExpressionEvalSizeComputer;
@@ -21,10 +22,9 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IMergeAggregationExpressionFactory;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.INullableTypeComputer;
 import edu.uci.ics.hyracks.algebricks.core.algebra.metadata.IMetadataProvider;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.PlanCompiler;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.config.AlgebricksConfig;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.PlanCompiler;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.AlgebricksOptimizationContext;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.HeuristicOptimizer;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IOptimizationContextFactory;
diff --git a/hyracks-algebricks/hyracks-algebricks-compiler/src/main/java/edu/uci/ics/hyracks/algebricks/compiler/api/ICompiler.java b/hyracks-algebricks/hyracks-algebricks-compiler/src/main/java/edu/uci/ics/hyracks/algebricks/compiler/api/ICompiler.java
index 654337a..9146722 100644
--- a/hyracks-algebricks/hyracks-algebricks-compiler/src/main/java/edu/uci/ics/hyracks/algebricks/compiler/api/ICompiler.java
+++ b/hyracks-algebricks/hyracks-algebricks-compiler/src/main/java/edu/uci/ics/hyracks/algebricks/compiler/api/ICompiler.java
@@ -14,7 +14,7 @@
  */
 package edu.uci.ics.hyracks.algebricks.compiler.api;
 
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.api.job.JobSpecification;
 
 public interface ICompiler {
diff --git a/hyracks-algebricks/hyracks-algebricks-compiler/src/main/java/edu/uci/ics/hyracks/algebricks/compiler/rewriter/rulecontrollers/PrioritizedRuleController.java b/hyracks-algebricks/hyracks-algebricks-compiler/src/main/java/edu/uci/ics/hyracks/algebricks/compiler/rewriter/rulecontrollers/PrioritizedRuleController.java
index 129ec26..8ba6583 100644
--- a/hyracks-algebricks/hyracks-algebricks-compiler/src/main/java/edu/uci/ics/hyracks/algebricks/compiler/rewriter/rulecontrollers/PrioritizedRuleController.java
+++ b/hyracks-algebricks/hyracks-algebricks-compiler/src/main/java/edu/uci/ics/hyracks/algebricks/compiler/rewriter/rulecontrollers/PrioritizedRuleController.java
@@ -18,8 +18,8 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.AbstractRuleController;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 
diff --git a/hyracks-algebricks/hyracks-algebricks-compiler/src/main/java/edu/uci/ics/hyracks/algebricks/compiler/rewriter/rulecontrollers/SequentialFixpointRuleController.java b/hyracks-algebricks/hyracks-algebricks-compiler/src/main/java/edu/uci/ics/hyracks/algebricks/compiler/rewriter/rulecontrollers/SequentialFixpointRuleController.java
index 8be65f4..978a647 100644
--- a/hyracks-algebricks/hyracks-algebricks-compiler/src/main/java/edu/uci/ics/hyracks/algebricks/compiler/rewriter/rulecontrollers/SequentialFixpointRuleController.java
+++ b/hyracks-algebricks/hyracks-algebricks-compiler/src/main/java/edu/uci/ics/hyracks/algebricks/compiler/rewriter/rulecontrollers/SequentialFixpointRuleController.java
@@ -18,19 +18,16 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.AbstractRuleController;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 
 /**
- * 
  * Runs rules sequentially (round-robin), until one iteration over all rules
  * produces no change.
  * 
- * 
  * @author Nicola
- * 
  */
 public class SequentialFixpointRuleController extends AbstractRuleController {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-compiler/src/main/java/edu/uci/ics/hyracks/algebricks/compiler/rewriter/rulecontrollers/SequentialOnceRuleController.java b/hyracks-algebricks/hyracks-algebricks-compiler/src/main/java/edu/uci/ics/hyracks/algebricks/compiler/rewriter/rulecontrollers/SequentialOnceRuleController.java
index 5cf62e0..1e37d14 100644
--- a/hyracks-algebricks/hyracks-algebricks-compiler/src/main/java/edu/uci/ics/hyracks/algebricks/compiler/rewriter/rulecontrollers/SequentialOnceRuleController.java
+++ b/hyracks-algebricks/hyracks-algebricks-compiler/src/main/java/edu/uci/ics/hyracks/algebricks/compiler/rewriter/rulecontrollers/SequentialOnceRuleController.java
@@ -18,8 +18,8 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.AbstractRuleController;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/pom.xml b/hyracks-algebricks/hyracks-algebricks-core/pom.xml
index 9fb84a7..f3e9b74 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/pom.xml
+++ b/hyracks-algebricks/hyracks-algebricks-core/pom.xml
@@ -37,5 +37,15 @@
   	<artifactId>hyracks-dataflow-std</artifactId>
   	<version>0.2.1-SNAPSHOT</version>
   </dependency>
+  <dependency>
+  	<groupId>edu.uci.ics.hyracks</groupId>
+  	<artifactId>hyracks-algebricks-runtime</artifactId>
+  	<version>0.2.1-SNAPSHOT</version>
+  </dependency>
+  <dependency>
+  	<groupId>edu.uci.ics.hyracks</groupId>
+  	<artifactId>hyracks-algebricks-common</artifactId>
+  	<version>0.2.1-SNAPSHOT</version>
+  </dependency>
   </dependencies>
 </project>
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/base/IHyracksJobBuilder.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/base/IHyracksJobBuilder.java
index 19c85c6..4c6e747 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/base/IHyracksJobBuilder.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/base/IHyracksJobBuilder.java
@@ -16,9 +16,9 @@
 
 import java.util.List;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IPushRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.constraints.AlgebricksPartitionConstraint;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.constraints.AlgebricksPartitionConstraint;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IPushRuntimeFactory;
 import edu.uci.ics.hyracks.api.dataflow.IConnectorDescriptor;
 import edu.uci.ics.hyracks.api.dataflow.IOperatorDescriptor;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/base/ILogicalExpression.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/base/ILogicalExpression.java
index a54a88d..b1a2408 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/base/ILogicalExpression.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/base/ILogicalExpression.java
@@ -20,9 +20,9 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.FunctionalDependency;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public interface ILogicalExpression {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/base/ILogicalOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/base/ILogicalOperator.java
index 719b5df..c99d621 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/base/ILogicalOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/base/ILogicalOperator.java
@@ -19,16 +19,16 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.VariablePropagationPolicy;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
 
 public interface ILogicalOperator {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/base/ILogicalPlanAndMetadata.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/base/ILogicalPlanAndMetadata.java
index 5a616c6..1d354de 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/base/ILogicalPlanAndMetadata.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/base/ILogicalPlanAndMetadata.java
@@ -14,8 +14,8 @@
  */
 package edu.uci.ics.hyracks.algebricks.core.algebra.base;
 
+import edu.uci.ics.hyracks.algebricks.common.constraints.AlgebricksPartitionConstraint;
 import edu.uci.ics.hyracks.algebricks.core.algebra.metadata.IMetadataProvider;
-import edu.uci.ics.hyracks.algebricks.core.api.constraints.AlgebricksPartitionConstraint;
 
 public interface ILogicalPlanAndMetadata {
     public ILogicalPlan getPlan();
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/base/IOptimizationContext.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/base/IOptimizationContext.java
index 4daaceb..468d25c 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/base/IOptimizationContext.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/base/IOptimizationContext.java
@@ -17,6 +17,7 @@
 import java.util.List;
 import java.util.Map;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IExpressionEvalSizeComputer;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IMergeAggregationExpressionFactory;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableEvalSizeEnvironment;
@@ -24,7 +25,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.FunctionalDependency;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.ILogicalPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.PhysicalOptimizationConfig;
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/base/IPhysicalOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/base/IPhysicalOperator.java
index 46d2dc3..58c2870 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/base/IPhysicalOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/base/IPhysicalOperator.java
@@ -14,11 +14,11 @@
  */
 package edu.uci.ics.hyracks.algebricks.core.algebra.base;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
 
 public interface IPhysicalOperator {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/IAWriter.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/IAWriter.java
deleted file mode 100644
index d29fab6..0000000
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/IAWriter.java
+++ /dev/null
@@ -1,11 +0,0 @@
-package edu.uci.ics.hyracks.algebricks.core.algebra.data;
-
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.dataflow.common.comm.io.FrameTupleAccessor;
-
-public interface IAWriter {
-
-    public void init() throws AlgebricksException;
-
-    public void printTuple(FrameTupleAccessor tAccess, int tIdx) throws AlgebricksException;
-}
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/AggregateFunctionCallExpression.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/AggregateFunctionCallExpression.java
index ac77ee2..a720039 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/AggregateFunctionCallExpression.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/AggregateFunctionCallExpression.java
@@ -18,10 +18,10 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.IFunctionInfo;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 /**
  * 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/ConstantExpression.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/ConstantExpression.java
index 2fa0637..a0b7674 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/ConstantExpression.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/ConstantExpression.java
@@ -21,11 +21,11 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalExpressionTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public final class ConstantExpression extends AbstractLogicalExpression {
     private IAlgebricksConstantValue value;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/IExpressionEvalSizeComputer.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/IExpressionEvalSizeComputer.java
index 8dd807e..623f7bb 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/IExpressionEvalSizeComputer.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/IExpressionEvalSizeComputer.java
@@ -14,8 +14,8 @@
  */
 package edu.uci.ics.hyracks.algebricks.core.algebra.expressions;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public interface IExpressionEvalSizeComputer {
     // size in bytes, or -1 if unknown
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/IExpressionTypeComputer.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/IExpressionTypeComputer.java
index 72861ae..3057d8a 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/IExpressionTypeComputer.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/IExpressionTypeComputer.java
@@ -14,9 +14,9 @@
  */
 package edu.uci.ics.hyracks.algebricks.core.algebra.expressions;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.metadata.IMetadataProvider;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public interface IExpressionTypeComputer {
     public Object getType(ILogicalExpression expr, IMetadataProvider<?, ?> metadataProvider,
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/ILogicalExpressionJobGen.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/ILogicalExpressionJobGen.java
index babfede..38de044 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/ILogicalExpressionJobGen.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/ILogicalExpressionJobGen.java
@@ -14,15 +14,15 @@
  */
 package edu.uci.ics.hyracks.algebricks.core.algebra.expressions;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IAggregateFunctionFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluatorFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IRunningAggregateFunctionFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.ISerializableAggregateFunctionFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IUnnestingFunctionFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IAggregateFunctionFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IRunningAggregateFunctionFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ISerializableAggregateFunctionFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IUnnestingFunctionFactory;
 
 public interface ILogicalExpressionJobGen {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/IMergeAggregationExpressionFactory.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/IMergeAggregationExpressionFactory.java
index 36a414c..04bb824 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/IMergeAggregationExpressionFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/IMergeAggregationExpressionFactory.java
@@ -1,8 +1,8 @@
 package edu.uci.ics.hyracks.algebricks.core.algebra.expressions;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public interface IMergeAggregationExpressionFactory {
     ILogicalExpression createMergeAggregation(ILogicalExpression expr, IOptimizationContext env)
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/INullableTypeComputer.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/INullableTypeComputer.java
index 3290e35..37b6d80 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/INullableTypeComputer.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/INullableTypeComputer.java
@@ -1,6 +1,6 @@
 package edu.uci.ics.hyracks.algebricks.core.algebra.expressions;
 
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 
 public interface INullableTypeComputer {
     public Object makeNullableType(Object type) throws AlgebricksException;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/IPartialAggregationTypeComputer.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/IPartialAggregationTypeComputer.java
index 88e34e9..5921335 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/IPartialAggregationTypeComputer.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/IPartialAggregationTypeComputer.java
@@ -1,8 +1,8 @@
 package edu.uci.ics.hyracks.algebricks.core.algebra.expressions;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.metadata.IMetadataProvider;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public interface IPartialAggregationTypeComputer {
     public Object getType(ILogicalExpression expr, IVariableTypeEnvironment env,
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/IVariableTypeEnvironment.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/IVariableTypeEnvironment.java
index 0827b97..2275227 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/IVariableTypeEnvironment.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/IVariableTypeEnvironment.java
@@ -16,9 +16,9 @@
 
 import java.util.List;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public interface IVariableTypeEnvironment {
     public Object getVarType(LogicalVariable var) throws AlgebricksException;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/ScalarFunctionCallExpression.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/ScalarFunctionCallExpression.java
index fa8838b..bf3f82b 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/ScalarFunctionCallExpression.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/ScalarFunctionCallExpression.java
@@ -18,10 +18,10 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.IFunctionInfo;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class ScalarFunctionCallExpression extends AbstractFunctionCallExpression {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/StatefulFunctionCallExpression.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/StatefulFunctionCallExpression.java
index c5cd897..40f25b2 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/StatefulFunctionCallExpression.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/StatefulFunctionCallExpression.java
@@ -18,12 +18,12 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.IFunctionInfo;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPartitioningProperty;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPropertiesComputer;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class StatefulFunctionCallExpression extends AbstractFunctionCallExpression {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/UnnestingFunctionCallExpression.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/UnnestingFunctionCallExpression.java
index 5f3de4b..71932d8 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/UnnestingFunctionCallExpression.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/UnnestingFunctionCallExpression.java
@@ -18,10 +18,10 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.IFunctionInfo;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class UnnestingFunctionCallExpression extends AbstractFunctionCallExpression {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/VariableReferenceExpression.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/VariableReferenceExpression.java
index ecd993f..a998a3b 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/VariableReferenceExpression.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/expressions/VariableReferenceExpression.java
@@ -19,11 +19,11 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalExpressionTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class VariableReferenceExpression extends AbstractLogicalExpression {
     private LogicalVariable variable;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/metadata/IMetadataProvider.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/metadata/IMetadataProvider.java
index b37393b..1b92328 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/metadata/IMetadataProvider.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/metadata/IMetadataProvider.java
@@ -16,16 +16,16 @@
 
 import java.util.List;
 
+import edu.uci.ics.hyracks.algebricks.common.constraints.AlgebricksPartitionConstraint;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IPrinterFactory;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.IFunctionInfo;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IPushRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.api.constraints.AlgebricksPartitionConstraint;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.data.IPrinterFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IPushRuntimeFactory;
 import edu.uci.ics.hyracks.api.dataflow.IOperatorDescriptor;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 import edu.uci.ics.hyracks.api.job.JobSpecification;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/AbstractAssignOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/AbstractAssignOperator.java
index 456010a..0e83902 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/AbstractAssignOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/AbstractAssignOperator.java
@@ -19,14 +19,13 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 /**
  * @author Nicola
- * 
  */
 public abstract class AbstractAssignOperator extends AbstractLogicalOperator {
     protected final List<LogicalVariable> variables;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/AbstractBinaryJoinOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/AbstractBinaryJoinOperator.java
index c2911d4..5ab44a4 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/AbstractBinaryJoinOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/AbstractBinaryJoinOperator.java
@@ -18,12 +18,12 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.VariablePropagationPolicy;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public abstract class AbstractBinaryJoinOperator extends AbstractLogicalOperator {
     protected final Mutable<ILogicalExpression> condition;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/AbstractLogicalOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/AbstractLogicalOperator.java
index 88fd0d5..4acd53b 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/AbstractLogicalOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/AbstractLogicalOperator.java
@@ -21,6 +21,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -31,12 +32,11 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.TypePropagationPolicy;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypeEnvPointer;
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.OpRefTypeEnvPointer;
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.PropagatingTypeEnvironment;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
 
 public abstract class AbstractLogicalOperator implements ILogicalOperator {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/AbstractScanOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/AbstractScanOperator.java
index e4e7ec8..4d8cce0 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/AbstractScanOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/AbstractScanOperator.java
@@ -17,9 +17,9 @@
 import java.util.ArrayList;
 import java.util.List;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.VariablePropagationPolicy;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public abstract class AbstractScanOperator extends AbstractLogicalOperator {
     protected List<LogicalVariable> variables;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/AbstractUnnestOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/AbstractUnnestOperator.java
index 22f73ff..9eaf059 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/AbstractUnnestOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/AbstractUnnestOperator.java
@@ -18,10 +18,10 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public abstract class AbstractUnnestOperator extends AbstractScanOperator {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/AggregateOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/AggregateOperator.java
index 1555a76..d9496f8 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/AggregateOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/AggregateOperator.java
@@ -5,6 +5,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
@@ -13,7 +14,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.NonPropagatingTypeEnvironment;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class AggregateOperator extends AbstractAssignOperator {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/AssignOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/AssignOperator.java
index eedd3a2..a4dc2e0 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/AssignOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/AssignOperator.java
@@ -18,6 +18,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
@@ -25,14 +26,11 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.VariablePropagationPolicy;
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 /**
- * 
  * It corresponds to the Map operator in other algebras.
  * 
  * @author Nicola
- * 
  */
 
 public class AssignOperator extends AbstractAssignOperator {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/DataSourceScanOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/DataSourceScanOperator.java
index bcc1192..3227f3d 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/DataSourceScanOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/DataSourceScanOperator.java
@@ -18,6 +18,7 @@
 import java.util.Collection;
 import java.util.List;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment;
@@ -26,7 +27,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class DataSourceScanOperator extends AbstractScanOperator {
     private IDataSource<?> dataSource;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/DieOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/DieOperator.java
index 2e330cf..20aa574 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/DieOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/DieOperator.java
@@ -19,6 +19,7 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
@@ -27,7 +28,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class DieOperator extends AbstractLogicalOperator {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/DistinctOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/DistinctOperator.java
index 4d479e1..ee0dcf6 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/DistinctOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/DistinctOperator.java
@@ -19,6 +19,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalExpressionTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
@@ -29,7 +30,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class DistinctOperator extends AbstractLogicalOperator {
     private final List<Mutable<ILogicalExpression>> expressions;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/EmptyTupleSourceOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/EmptyTupleSourceOperator.java
index 732dfbe..45f9909 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/EmptyTupleSourceOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/EmptyTupleSourceOperator.java
@@ -17,6 +17,7 @@
 import java.util.ArrayList;
 import java.util.List;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
@@ -25,7 +26,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class EmptyTupleSourceOperator extends AbstractLogicalOperator {
 
@@ -56,7 +56,7 @@
         return visitor.visitEmptyTupleSourceOperator(this, arg);
     }
 
-     @Override
+    @Override
     public void recomputeSchema() {
         schema = new ArrayList<LogicalVariable>();
     }
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/ExchangeOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/ExchangeOperator.java
index 3e046b5..aba5f83 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/ExchangeOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/ExchangeOperator.java
@@ -17,6 +17,7 @@
 import java.util.ArrayList;
 import java.util.List;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment;
@@ -25,7 +26,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.util.OperatorPropertiesUtil;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class ExchangeOperator extends AbstractLogicalOperator {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/GroupByOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/GroupByOperator.java
index 762f034..ba396f4 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/GroupByOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/GroupByOperator.java
@@ -21,6 +21,8 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
@@ -37,8 +39,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.PropagatingTypeEnvironment;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
 
 public class GroupByOperator extends AbstractOperatorWithNestedPlans {
     // If the LogicalVariable in a pair is null, it means that the GroupBy is
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/IndexInsertDeleteOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/IndexInsertDeleteOperator.java
index 7264763..aa0db31 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/IndexInsertDeleteOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/IndexInsertDeleteOperator.java
@@ -5,6 +5,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
@@ -15,7 +16,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class IndexInsertDeleteOperator extends AbstractLogicalOperator {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/InnerJoinOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/InnerJoinOperator.java
index c2f0161..54fab7c 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/InnerJoinOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/InnerJoinOperator.java
@@ -16,13 +16,13 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment;
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class InnerJoinOperator extends AbstractBinaryJoinOperator {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/InsertDeleteOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/InsertDeleteOperator.java
index 6699228..91e51f6 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/InsertDeleteOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/InsertDeleteOperator.java
@@ -5,6 +5,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
@@ -14,7 +15,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class InsertDeleteOperator extends AbstractLogicalOperator {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/LeftOuterJoinOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/LeftOuterJoinOperator.java
index 7c5be7e..60da2cf 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/LeftOuterJoinOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/LeftOuterJoinOperator.java
@@ -16,6 +16,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
@@ -26,7 +27,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.OpRefTypeEnvPointer;
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.PropagatingTypeEnvironment;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class LeftOuterJoinOperator extends AbstractBinaryJoinOperator {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/LimitOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/LimitOperator.java
index 21738f6..3c6a699 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/LimitOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/LimitOperator.java
@@ -19,6 +19,7 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
@@ -27,7 +28,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class LimitOperator extends AbstractLogicalOperator {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/NestedTupleSourceOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/NestedTupleSourceOperator.java
index 189a410..a9a8f55 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/NestedTupleSourceOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/NestedTupleSourceOperator.java
@@ -18,6 +18,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
@@ -29,7 +30,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.PropagatingTypeEnvironment;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class NestedTupleSourceOperator extends AbstractLogicalOperator {
     private final Mutable<ILogicalOperator> dataSourceReference;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/OrderOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/OrderOperator.java
index 3a5cdde..812c219 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/OrderOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/OrderOperator.java
@@ -19,6 +19,8 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
@@ -28,8 +30,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
 
 public class OrderOperator extends AbstractLogicalOperator {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/PartitioningSplitOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/PartitioningSplitOperator.java
index a76237b..37de0f9 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/PartitioningSplitOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/PartitioningSplitOperator.java
@@ -18,6 +18,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
@@ -26,7 +27,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class PartitioningSplitOperator extends AbstractLogicalOperator {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/ProjectOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/ProjectOperator.java
index 736ae1d..459e5dd 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/ProjectOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/ProjectOperator.java
@@ -17,6 +17,7 @@
 import java.util.ArrayList;
 import java.util.List;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment;
@@ -25,7 +26,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class ProjectOperator extends AbstractLogicalOperator {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/ReplicateOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/ReplicateOperator.java
index f594373..a4e9d2b 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/ReplicateOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/ReplicateOperator.java
@@ -16,6 +16,7 @@
 
 import java.util.ArrayList;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment;
@@ -23,7 +24,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class ReplicateOperator extends AbstractLogicalOperator {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/RunningAggregateOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/RunningAggregateOperator.java
index 798597e..3694503 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/RunningAggregateOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/RunningAggregateOperator.java
@@ -18,6 +18,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
@@ -25,7 +26,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.VariablePropagationPolicy;
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class RunningAggregateOperator extends AbstractAssignOperator {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/ScriptOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/ScriptOperator.java
index dc2795c..c75fb40 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/ScriptOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/ScriptOperator.java
@@ -16,6 +16,8 @@
 
 import java.util.ArrayList;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment;
@@ -25,8 +27,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.NonPropagatingTypeEnvironment;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
 
 public class ScriptOperator extends AbstractLogicalOperator {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/SelectOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/SelectOperator.java
index 9d8a032..8c611b0 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/SelectOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/SelectOperator.java
@@ -18,6 +18,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalExpressionTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
@@ -34,7 +35,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.PropagatingTypeEnvironment;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class SelectOperator extends AbstractLogicalOperator {
     private final Mutable<ILogicalExpression> condition;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/SinkOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/SinkOperator.java
index a75a9a9..1b12423 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/SinkOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/SinkOperator.java
@@ -2,6 +2,7 @@
 
 import java.util.ArrayList;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment;
@@ -13,7 +14,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.PropagatingTypeEnvironment;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class SinkOperator extends AbstractLogicalOperator {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/SubplanOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/SubplanOperator.java
index 0d1704b..89707eb 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/SubplanOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/SubplanOperator.java
@@ -21,6 +21,7 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
@@ -35,7 +36,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.PropagatingTypeEnvironment;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class SubplanOperator extends AbstractOperatorWithNestedPlans {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/UnionAllOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/UnionAllOperator.java
index cec7d6f..c7100dd 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/UnionAllOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/UnionAllOperator.java
@@ -17,6 +17,8 @@
 import java.util.ArrayList;
 import java.util.List;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Triple;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment;
@@ -25,8 +27,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.NonPropagatingTypeEnvironment;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Triple;
 
 public class UnionAllOperator extends AbstractLogicalOperator {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/UnnestMapOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/UnnestMapOperator.java
index c4f5cb0..0d20f22 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/UnnestMapOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/UnnestMapOperator.java
@@ -18,6 +18,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
@@ -26,11 +27,9 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.NonPropagatingTypeEnvironment;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 /**
  * This operator may go away after we add indexes to Algebricks.
- * 
  */
 public class UnnestMapOperator extends AbstractUnnestOperator {
 
@@ -55,11 +54,9 @@
     }
 
     /**
-     * 
      * UnnestMap doesn't propagate input variables, because currently it is only
      * used to search indexes. In the future, it would be nice to have the
      * choice to propagate input variables or not.
-     * 
      */
     @Override
     public VariablePropagationPolicy getVariablePropagationPolicy() {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/UnnestOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/UnnestOperator.java
index f85cabb..2e1ef16 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/UnnestOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/UnnestOperator.java
@@ -18,13 +18,13 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment;
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class UnnestOperator extends AbstractUnnestOperator {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/UpdateOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/UpdateOperator.java
index 4f94f34..f156490 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/UpdateOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/UpdateOperator.java
@@ -1,12 +1,12 @@
 package edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.VariablePropagationPolicy;
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class UpdateOperator extends AbstractLogicalOperator {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/WriteOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/WriteOperator.java
index fdcdfd8..4c14333 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/WriteOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/WriteOperator.java
@@ -19,6 +19,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
@@ -28,7 +29,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class WriteOperator extends AbstractLogicalOperator {
     private List<Mutable<ILogicalExpression>> expressions;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/WriteResultOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/WriteResultOperator.java
index 6d05c76..48065a5 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/WriteResultOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/WriteResultOperator.java
@@ -19,6 +19,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
@@ -28,7 +29,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class WriteResultOperator extends AbstractLogicalOperator {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/FDsAndEquivClassesVisitor.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/FDsAndEquivClassesVisitor.java
index 0c0f257..3ff1534 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/FDsAndEquivClassesVisitor.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/FDsAndEquivClassesVisitor.java
@@ -25,6 +25,9 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.NotImplementedException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.EquivalenceClass;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
@@ -70,10 +73,7 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.FunctionalDependency;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.LocalGroupingProperty;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.NotImplementedException;
 import edu.uci.ics.hyracks.algebricks.core.config.AlgebricksConfig;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
 
 public class FDsAndEquivClassesVisitor implements ILogicalOperatorVisitor<Void, IOptimizationContext> {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/IsomorphismOperatorVisitor.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/IsomorphismOperatorVisitor.java
index 5d9e6b9..4ea6faf 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/IsomorphismOperatorVisitor.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/IsomorphismOperatorVisitor.java
@@ -24,6 +24,9 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.common.utils.Triple;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
@@ -64,9 +67,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPartitioningProperty;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
-import edu.uci.ics.hyracks.algebricks.core.utils.Triple;
 
 public class IsomorphismOperatorVisitor implements ILogicalOperatorVisitor<Boolean, ILogicalOperator> {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/IsomorphismUtilities.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/IsomorphismUtilities.java
index 21271fd..02533c3 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/IsomorphismUtilities.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/IsomorphismUtilities.java
@@ -16,9 +16,9 @@
 
 import java.util.Map;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class IsomorphismUtilities {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/IsomorphismVariableMappingVisitor.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/IsomorphismVariableMappingVisitor.java
index 340b855..3c81250 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/IsomorphismVariableMappingVisitor.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/IsomorphismVariableMappingVisitor.java
@@ -22,6 +22,9 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.common.utils.Triple;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
@@ -58,9 +61,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.WriteOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.WriteResultOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
-import edu.uci.ics.hyracks.algebricks.core.utils.Triple;
 
 public class IsomorphismVariableMappingVisitor implements ILogicalOperatorVisitor<Void, ILogicalOperator> {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/LogicalPropertiesVisitor.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/LogicalPropertiesVisitor.java
index 30ad3ab..2f0cf07 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/LogicalPropertiesVisitor.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/LogicalPropertiesVisitor.java
@@ -16,6 +16,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -54,7 +55,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.ILogicalPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.LogicalPropertiesVectorImpl;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.config.AlgebricksConfig;
 
 public class LogicalPropertiesVisitor implements ILogicalOperatorVisitor<Void, IOptimizationContext> {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/ProducedVariableVisitor.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/ProducedVariableVisitor.java
index cd05624..0e2b4a2 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/ProducedVariableVisitor.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/ProducedVariableVisitor.java
@@ -20,6 +20,9 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.common.utils.Triple;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
@@ -53,9 +56,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.WriteOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.WriteResultOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
-import edu.uci.ics.hyracks.algebricks.core.utils.Triple;
 
 public class ProducedVariableVisitor implements ILogicalOperatorVisitor<Void, Void> {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/SchemaVariableVisitor.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/SchemaVariableVisitor.java
index 6aa3796..a917756 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/SchemaVariableVisitor.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/SchemaVariableVisitor.java
@@ -18,6 +18,8 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
@@ -53,8 +55,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.WriteOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.WriteResultOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
 
 public class SchemaVariableVisitor implements ILogicalOperatorVisitor<Void, Void> {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/SubstituteVariableVisitor.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/SubstituteVariableVisitor.java
index b85c798..717a2ab 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/SubstituteVariableVisitor.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/SubstituteVariableVisitor.java
@@ -19,6 +19,9 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.common.utils.Triple;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
@@ -57,9 +60,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.util.OperatorManipulationUtil;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
-import edu.uci.ics.hyracks.algebricks.core.utils.Triple;
 
 public class SubstituteVariableVisitor implements ILogicalOperatorVisitor<Void, Pair<LogicalVariable, LogicalVariable>> {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/UsedVariableVisitor.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/UsedVariableVisitor.java
index d9d6a6a..124a8e4 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/UsedVariableVisitor.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/UsedVariableVisitor.java
@@ -19,6 +19,9 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.common.utils.Triple;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
@@ -53,9 +56,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.WriteOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.WriteResultOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
-import edu.uci.ics.hyracks.algebricks.core.utils.Triple;
 
 public class UsedVariableVisitor implements ILogicalOperatorVisitor<Void, Void> {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/VariableUtilities.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/VariableUtilities.java
index 8e9c5b8..25f22e7 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/VariableUtilities.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/logical/visitors/VariableUtilities.java
@@ -21,12 +21,12 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
 
 public class VariableUtilities {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/AbstractExchangePOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/AbstractExchangePOperator.java
index 761c7f2..0aa9cd4 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/AbstractExchangePOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/AbstractExchangePOperator.java
@@ -14,15 +14,15 @@
  */
 package edu.uci.ics.hyracks.algebricks.core.algebra.operators.physical;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder.TargetConstraint;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
 import edu.uci.ics.hyracks.api.dataflow.IConnectorDescriptor;
-import edu.uci.ics.hyracks.api.job.JobSpecification;
+import edu.uci.ics.hyracks.api.job.IConnectorDescriptorRegistry;
 
 public abstract class AbstractExchangePOperator extends AbstractPhysicalOperator {
     public void contributeRuntimeOperator(IHyracksJobBuilder builder, JobGenContext context, ILogicalOperator op,
@@ -40,6 +40,7 @@
         return false;
     }
 
-    public abstract Pair<IConnectorDescriptor, TargetConstraint> createConnectorDescriptor(JobSpecification spec,
-            ILogicalOperator op, IOperatorSchema opSchema, JobGenContext context) throws AlgebricksException;
+    public abstract Pair<IConnectorDescriptor, TargetConstraint> createConnectorDescriptor(
+            IConnectorDescriptorRegistry spec, ILogicalOperator op, IOperatorSchema opSchema, JobGenContext context)
+            throws AlgebricksException;
 }
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/AbstractHashJoinPOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/AbstractHashJoinPOperator.java
index 3a481d0..7be425e 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/AbstractHashJoinPOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/AbstractHashJoinPOperator.java
@@ -18,6 +18,10 @@
 import java.util.Map;
 import java.util.Set;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.NotImplementedException;
+import edu.uci.ics.hyracks.algebricks.common.utils.ListSet;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.EquivalenceClass;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -32,10 +36,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.UnorderedPartitionedProperty;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.NotImplementedException;
-import edu.uci.ics.hyracks.algebricks.core.utils.ListSet;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
 
 public abstract class AbstractHashJoinPOperator extends AbstractJoinPOperator {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/AbstractPhysicalOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/AbstractPhysicalOperator.java
index 620c161..c5f4c71 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/AbstractPhysicalOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/AbstractPhysicalOperator.java
@@ -16,6 +16,10 @@
 
 import java.util.Map;
 
+import edu.uci.ics.hyracks.algebricks.common.constraints.AlgebricksCountPartitionConstraint;
+import edu.uci.ics.hyracks.algebricks.common.constraints.AlgebricksPartitionConstraint;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.NotImplementedException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
@@ -28,14 +32,10 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.AlgebricksPipeline;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.PlanCompiler;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.meta.AlgebricksMetaOperatorDescriptor;
-import edu.uci.ics.hyracks.algebricks.core.api.constraints.AlgebricksCountPartitionConstraint;
-import edu.uci.ics.hyracks.algebricks.core.api.constraints.AlgebricksPartitionConstraint;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.NotImplementedException;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.PlanCompiler;
+import edu.uci.ics.hyracks.algebricks.runtime.base.AlgebricksPipeline;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.meta.AlgebricksMetaOperatorDescriptor;
 import edu.uci.ics.hyracks.api.dataflow.IOperatorDescriptor;
 import edu.uci.ics.hyracks.api.dataflow.OperatorDescriptorId;
 import edu.uci.ics.hyracks.api.job.JobSpecification;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/AbstractPreclusteredGroupByPOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/AbstractPreclusteredGroupByPOperator.java
index 6065126..7dd6372 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/AbstractPreclusteredGroupByPOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/AbstractPreclusteredGroupByPOperator.java
@@ -8,6 +8,8 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.utils.ListSet;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.EquivalenceClass;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
@@ -34,8 +36,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PropertiesUtil;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.UnorderedPartitionedProperty;
-import edu.uci.ics.hyracks.algebricks.core.utils.ListSet;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
 
 public abstract class AbstractPreclusteredGroupByPOperator extends AbstractPhysicalOperator {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/AbstractStableSortPOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/AbstractStableSortPOperator.java
index ca09b77..63ea8b9 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/AbstractStableSortPOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/AbstractStableSortPOperator.java
@@ -19,6 +19,8 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.NotImplementedException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -37,8 +39,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.OrderColumn;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.NotImplementedException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
 
 public abstract class AbstractStableSortPOperator extends AbstractPhysicalOperator {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/AggregatePOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/AggregatePOperator.java
index 47038ad..e6dfa53 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/AggregatePOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/AggregatePOperator.java
@@ -19,6 +19,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
@@ -34,11 +35,10 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IAggregateFunctionFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenHelper;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.aggreg.AggregateRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenHelper;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IAggregateFunctionFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.aggreg.AggregateRuntimeFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 
 public class AggregatePOperator extends AbstractPhysicalOperator {
@@ -79,8 +79,7 @@
         IAggregateFunctionFactory[] aggFactories = new IAggregateFunctionFactory[expressions.size()];
         ILogicalExpressionJobGen exprJobGen = context.getExpressionJobGen();
         for (int i = 0; i < aggFactories.length; i++) {
-            AggregateFunctionCallExpression aggFun = (AggregateFunctionCallExpression) expressions.get(i)
-                    .getValue();
+            AggregateFunctionCallExpression aggFun = (AggregateFunctionCallExpression) expressions.get(i).getValue();
             aggFactories[i] = exprJobGen.createAggregateFunctionFactory(aggFun,
                     context.getTypeEnvironment(op.getInputs().get(0).getValue()), inputSchemas, context);
         }
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/AssignPOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/AssignPOperator.java
index 861765d..040d11a 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/AssignPOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/AssignPOperator.java
@@ -18,6 +18,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
@@ -29,11 +30,10 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluatorFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenHelper;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std.AssignRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenHelper;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.std.AssignRuntimeFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 
 public class AssignPOperator extends AbstractPhysicalOperator {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/BroadcastPOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/BroadcastPOperator.java
index 0c780d5..bf19342 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/BroadcastPOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/BroadcastPOperator.java
@@ -14,6 +14,8 @@
  */
 package edu.uci.ics.hyracks.algebricks.core.algebra.operators.physical;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder.TargetConstraint;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -26,11 +28,9 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
 import edu.uci.ics.hyracks.api.dataflow.IConnectorDescriptor;
-import edu.uci.ics.hyracks.api.job.JobSpecification;
+import edu.uci.ics.hyracks.api.job.IConnectorDescriptorRegistry;
 import edu.uci.ics.hyracks.dataflow.std.connectors.MToNReplicatingConnectorDescriptor;
 
 public class BroadcastPOperator extends AbstractExchangePOperator {
@@ -61,7 +61,7 @@
     }
 
     @Override
-    public Pair<IConnectorDescriptor, TargetConstraint> createConnectorDescriptor(JobSpecification spec,
+    public Pair<IConnectorDescriptor, TargetConstraint> createConnectorDescriptor(IConnectorDescriptorRegistry spec,
             ILogicalOperator op, IOperatorSchema opSchema, JobGenContext context) throws AlgebricksException {
         IConnectorDescriptor conn = new MToNReplicatingConnectorDescriptor(spec);
         return new Pair<IConnectorDescriptor, TargetConstraint>(conn, null);
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/DataSourceScanPOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/DataSourceScanPOperator.java
index 68a6a24..4617ff4 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/DataSourceScanPOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/DataSourceScanPOperator.java
@@ -16,6 +16,9 @@
 
 import java.util.List;
 
+import edu.uci.ics.hyracks.algebricks.common.constraints.AlgebricksPartitionConstraint;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -26,10 +29,7 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.metadata.IMetadataProvider;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.DataSourceScanOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.api.constraints.AlgebricksPartitionConstraint;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
 import edu.uci.ics.hyracks.api.dataflow.IOperatorDescriptor;
 
 @SuppressWarnings("rawtypes")
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/EmptyTupleSourcePOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/EmptyTupleSourcePOperator.java
index 7fc76da..bf42c30 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/EmptyTupleSourcePOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/EmptyTupleSourcePOperator.java
@@ -16,6 +16,7 @@
 
 import java.util.LinkedList;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -26,9 +27,8 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std.EmptyTupleSourceRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.std.EmptyTupleSourceRuntimeFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/ExternalGroupByPOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/ExternalGroupByPOperator.java
index 690af2a..c5e0597 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/ExternalGroupByPOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/ExternalGroupByPOperator.java
@@ -7,6 +7,9 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.ListSet;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
@@ -32,24 +35,21 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.UnorderedPartitionedProperty;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.ISerializableAggregateFunctionFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenHelper;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.OperatorSchemaImpl;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.aggreg.SerializableAggregatorDescriptorFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.ListSet;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenHelper;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.OperatorSchemaImpl;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ISerializableAggregateFunctionFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.aggreg.SerializableAggregatorDescriptorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryHashFunctionFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.INormalizedKeyComputerFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ITuplePartitionComputerFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
-import edu.uci.ics.hyracks.api.job.JobSpecification;
+import edu.uci.ics.hyracks.api.job.IOperatorDescriptorRegistry;
 import edu.uci.ics.hyracks.dataflow.common.data.partition.FieldHashPartitionComputerFactory;
-import edu.uci.ics.hyracks.dataflow.std.group.ExternalGroupOperatorDescriptor;
 import edu.uci.ics.hyracks.dataflow.std.group.HashSpillableTableFactory;
 import edu.uci.ics.hyracks.dataflow.std.group.IAggregatorDescriptorFactory;
+import edu.uci.ics.hyracks.dataflow.std.group.external.ExternalGroupOperatorDescriptor;
 
 public class ExternalGroupByPOperator extends AbstractPhysicalOperator {
 
@@ -198,7 +198,7 @@
             aggOpInputEnv.setVarType(var, outputEnv.getVarType(var));
 
         compileSubplans(inputSchemas[0], gby, opSchema, context);
-        JobSpecification spec = builder.getJobSpec();
+        IOperatorDescriptorRegistry spec = builder.getJobSpec();
         IBinaryComparatorFactory[] comparatorFactories = JobGenHelper.variablesToAscBinaryComparatorFactories(gbyCols,
                 aggOpInputEnv, context);
         RecordDescriptor recordDescriptor = JobGenHelper.mkRecordDescriptor(op, opSchema, context);
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/HashPartitionExchangePOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/HashPartitionExchangePOperator.java
index 79447b3..043cb81 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/HashPartitionExchangePOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/HashPartitionExchangePOperator.java
@@ -16,12 +16,14 @@
 
 import java.util.List;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.ListSet;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder.TargetConstraint;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.PhysicalOperatorTag;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IBinaryHashFunctionFactoryProvider;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.INodeDomain;
@@ -30,14 +32,12 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.UnorderedPartitionedProperty;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.ListSet;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.data.IBinaryHashFunctionFactoryProvider;
 import edu.uci.ics.hyracks.api.dataflow.IConnectorDescriptor;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryHashFunctionFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ITuplePartitionComputerFactory;
-import edu.uci.ics.hyracks.api.job.JobSpecification;
+import edu.uci.ics.hyracks.api.job.IConnectorDescriptorRegistry;
 import edu.uci.ics.hyracks.dataflow.common.data.partition.FieldHashPartitionComputerFactory;
 import edu.uci.ics.hyracks.dataflow.std.connectors.MToNPartitioningConnectorDescriptor;
 
@@ -82,7 +82,7 @@
     }
 
     @Override
-    public Pair<IConnectorDescriptor, TargetConstraint> createConnectorDescriptor(JobSpecification spec,
+    public Pair<IConnectorDescriptor, TargetConstraint> createConnectorDescriptor(IConnectorDescriptorRegistry spec,
             ILogicalOperator op, IOperatorSchema opSchema, JobGenContext context) throws AlgebricksException {
         int[] keys = new int[hashFields.size()];
         IBinaryHashFunctionFactory[] hashFunctionFactories = new IBinaryHashFunctionFactory[hashFields.size()];
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/HashPartitionMergeExchangePOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/HashPartitionMergeExchangePOperator.java
index c3e8d0b..f3c9e5a 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/HashPartitionMergeExchangePOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/HashPartitionMergeExchangePOperator.java
@@ -18,13 +18,14 @@
 import java.util.LinkedList;
 import java.util.List;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.ListSet;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder.TargetConstraint;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.PhysicalOperatorTag;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IBinaryComparatorFactoryProvider;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IBinaryHashFunctionFactoryProvider;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema;
@@ -40,19 +41,17 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.UnorderedPartitionedProperty;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.ListSet;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.data.IBinaryComparatorFactoryProvider;
+import edu.uci.ics.hyracks.algebricks.data.IBinaryHashFunctionFactoryProvider;
 import edu.uci.ics.hyracks.api.dataflow.IConnectorDescriptor;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryHashFunctionFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ITuplePartitionComputerFactory;
-import edu.uci.ics.hyracks.api.job.JobSpecification;
+import edu.uci.ics.hyracks.api.job.IConnectorDescriptorRegistry;
 import edu.uci.ics.hyracks.dataflow.common.data.partition.FieldHashPartitionComputerFactory;
 import edu.uci.ics.hyracks.dataflow.std.connectors.MToNPartitioningMergingConnectorDescriptor;
 
-
 public class HashPartitionMergeExchangePOperator extends AbstractExchangePOperator {
 
     private List<OrderColumn> orderColumns;
@@ -124,7 +123,7 @@
     }
 
     @Override
-    public Pair<IConnectorDescriptor, TargetConstraint> createConnectorDescriptor(JobSpecification spec,
+    public Pair<IConnectorDescriptor, TargetConstraint> createConnectorDescriptor(IConnectorDescriptorRegistry spec,
             ILogicalOperator op, IOperatorSchema opSchema, JobGenContext context) throws AlgebricksException {
         int[] keys = new int[partitionFields.size()];
         IBinaryHashFunctionFactory[] hashFunctionFactories = new IBinaryHashFunctionFactory[partitionFields.size()];
@@ -150,7 +149,7 @@
                 sortFields[j] = opSchema.findVariable(var);
                 Object type = env.getVarType(var);
                 IBinaryComparatorFactoryProvider bcfp = context.getBinaryComparatorFactoryProvider();
-                comparatorFactories[j] = bcfp.getBinaryComparatorFactory(type, oc.getOrder());
+                comparatorFactories[j] = bcfp.getBinaryComparatorFactory(type, oc.getOrder() == OrderKind.ASC);
                 j++;
             }
         }
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/HybridHashJoinPOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/HybridHashJoinPOperator.java
index 2d3724a..934d6c8 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/HybridHashJoinPOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/HybridHashJoinPOperator.java
@@ -17,29 +17,28 @@
 import java.util.LinkedList;
 import java.util.List;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.NotImplementedException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.PhysicalOperatorTag;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IBinaryComparatorFactoryProvider;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractBinaryJoinOperator.JoinKind;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema;
-import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.OrderOperator.IOrder.OrderKind;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.ILocalStructuralProperty;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenHelper;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.NotImplementedException;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenHelper;
+import edu.uci.ics.hyracks.algebricks.data.IBinaryComparatorFactoryProvider;
 import edu.uci.ics.hyracks.api.dataflow.IOperatorDescriptor;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryHashFunctionFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.INullWriterFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
-import edu.uci.ics.hyracks.api.job.JobSpecification;
+import edu.uci.ics.hyracks.api.job.IOperatorDescriptorRegistry;
 import edu.uci.ics.hyracks.dataflow.std.join.HybridHashJoinOperatorDescriptor;
 
 public class HybridHashJoinPOperator extends AbstractHashJoinPOperator {
@@ -96,10 +95,10 @@
         IBinaryComparatorFactoryProvider bcfp = context.getBinaryComparatorFactoryProvider();
         for (LogicalVariable v : keysLeftBranch) {
             Object t = env.getVarType(v);
-            comparatorFactories[i++] = bcfp.getBinaryComparatorFactory(t, OrderKind.ASC);
+            comparatorFactories[i++] = bcfp.getBinaryComparatorFactory(t, true);
         }
         RecordDescriptor recDescriptor = JobGenHelper.mkRecordDescriptor(op, propagatedSchema, context);
-        JobSpecification spec = builder.getJobSpec();
+        IOperatorDescriptorRegistry spec = builder.getJobSpec();
         IOperatorDescriptor opDesc = null;
         try {
             switch (kind) {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/InMemoryHashJoinPOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/InMemoryHashJoinPOperator.java
index 08406d4..d6c6b85 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/InMemoryHashJoinPOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/InMemoryHashJoinPOperator.java
@@ -17,12 +17,13 @@
 import java.util.LinkedList;
 import java.util.List;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.NotImplementedException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.PhysicalOperatorTag;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IBinaryComparatorFactoryProvider;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractBinaryJoinOperator.JoinKind;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator;
@@ -30,16 +31,15 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.OrderOperator.IOrder.OrderKind;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.ILocalStructuralProperty;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenHelper;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.NotImplementedException;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenHelper;
+import edu.uci.ics.hyracks.algebricks.data.IBinaryComparatorFactoryProvider;
 import edu.uci.ics.hyracks.api.dataflow.IOperatorDescriptor;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryHashFunctionFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.INullWriterFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
-import edu.uci.ics.hyracks.api.job.JobSpecification;
+import edu.uci.ics.hyracks.api.job.IOperatorDescriptorRegistry;
 import edu.uci.ics.hyracks.dataflow.std.join.InMemoryHashJoinOperatorDescriptor;
 
 public class InMemoryHashJoinPOperator extends AbstractHashJoinPOperator {
@@ -85,10 +85,10 @@
         IBinaryComparatorFactoryProvider bcfp = context.getBinaryComparatorFactoryProvider();
         for (LogicalVariable v : keysLeftBranch) {
             Object t = env.getVarType(v);
-            comparatorFactories[i++] = bcfp.getBinaryComparatorFactory(t, OrderKind.ASC);
+            comparatorFactories[i++] = bcfp.getBinaryComparatorFactory(t, true);
         }
         RecordDescriptor recDescriptor = JobGenHelper.mkRecordDescriptor(op, propagatedSchema, context);
-        JobSpecification spec = builder.getJobSpec();
+        IOperatorDescriptorRegistry spec = builder.getJobSpec();
         IOperatorDescriptor opDesc = null;
 
         switch (kind) {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/InMemoryStableSortPOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/InMemoryStableSortPOperator.java
index 8b8138f..4ef5aad 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/InMemoryStableSortPOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/InMemoryStableSortPOperator.java
@@ -14,21 +14,21 @@
  */
 package edu.uci.ics.hyracks.algebricks.core.algebra.operators.physical;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.PhysicalOperatorTag;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IBinaryComparatorFactoryProvider;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.INormalizedKeyComputerFactoryProvider;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.OrderOperator.IOrder.OrderKind;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.OrderColumn;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IPushRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenHelper;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.sort.InMemorySortRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenHelper;
+import edu.uci.ics.hyracks.algebricks.data.IBinaryComparatorFactoryProvider;
+import edu.uci.ics.hyracks.algebricks.data.INormalizedKeyComputerFactoryProvider;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IPushRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.sort.InMemorySortRuntimeFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.INormalizedKeyComputerFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
@@ -66,11 +66,11 @@
             Object type = env.getVarType(var);
             OrderKind order = oc.getOrder();
             if (i == 0 && nkcfProvider != null && type != null) {
-                nkcf = nkcfProvider.getNormalizedKeyComputerFactory(type, order);
+                nkcf = nkcfProvider.getNormalizedKeyComputerFactory(type, order == OrderKind.ASC);
             }
 
             IBinaryComparatorFactoryProvider bcfp = context.getBinaryComparatorFactoryProvider();
-            comps[i] = bcfp.getBinaryComparatorFactory(type, oc.getOrder());
+            comps[i] = bcfp.getBinaryComparatorFactory(type, oc.getOrder() == OrderKind.ASC);
             i++;
         }
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/IndexInsertDeletePOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/IndexInsertDeletePOperator.java
index 276122f..ee31a34 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/IndexInsertDeletePOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/IndexInsertDeletePOperator.java
@@ -4,6 +4,9 @@
 import java.util.LinkedList;
 import java.util.List;
 
+import edu.uci.ics.hyracks.algebricks.common.constraints.AlgebricksPartitionConstraint;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -24,11 +27,8 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.OrderColumn;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenHelper;
-import edu.uci.ics.hyracks.algebricks.core.api.constraints.AlgebricksPartitionConstraint;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenHelper;
 import edu.uci.ics.hyracks.api.dataflow.IOperatorDescriptor;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 import edu.uci.ics.hyracks.api.job.JobSpecification;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/InsertDeletePOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/InsertDeletePOperator.java
index 2863aa6..edc85a9 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/InsertDeletePOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/InsertDeletePOperator.java
@@ -3,6 +3,9 @@
 import java.util.ArrayList;
 import java.util.List;
 
+import edu.uci.ics.hyracks.algebricks.common.constraints.AlgebricksPartitionConstraint;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -18,11 +21,8 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenHelper;
-import edu.uci.ics.hyracks.algebricks.core.api.constraints.AlgebricksPartitionConstraint;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenHelper;
 import edu.uci.ics.hyracks.api.dataflow.IOperatorDescriptor;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 import edu.uci.ics.hyracks.api.job.JobSpecification;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/MicroPreclusteredGroupByPOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/MicroPreclusteredGroupByPOperator.java
index 5b02d83..9d6eccf 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/MicroPreclusteredGroupByPOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/MicroPreclusteredGroupByPOperator.java
@@ -4,6 +4,8 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
@@ -14,13 +16,11 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.VariableReferenceExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.GroupByOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.AlgebricksPipeline;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenHelper;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.aggreg.NestedPlansAccumulatingAggregatorFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.group.MicroPreClusteredGroupRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenHelper;
+import edu.uci.ics.hyracks.algebricks.runtime.base.AlgebricksPipeline;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.aggreg.NestedPlansAccumulatingAggregatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.group.MicroPreClusteredGroupRuntimeFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 import edu.uci.ics.hyracks.dataflow.std.group.IAggregatorDescriptorFactory;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/NLJoinPOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/NLJoinPOperator.java
index 5978b10..cab826f 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/NLJoinPOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/NLJoinPOperator.java
@@ -17,11 +17,12 @@
 import java.util.LinkedList;
 import java.util.List;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.NotImplementedException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.PhysicalOperatorTag;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IBinaryBooleanInspector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.ILogicalExpressionJobGen;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractBinaryJoinOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractBinaryJoinOperator.JoinKind;
@@ -34,30 +35,26 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluatorFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenHelper;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.NotImplementedException;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenHelper;
+import edu.uci.ics.hyracks.algebricks.data.IBinaryBooleanInspector;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
 import edu.uci.ics.hyracks.api.comm.IFrameTupleAccessor;
 import edu.uci.ics.hyracks.api.dataflow.IOperatorDescriptor;
 import edu.uci.ics.hyracks.api.dataflow.value.ITuplePairComparator;
 import edu.uci.ics.hyracks.api.dataflow.value.ITuplePairComparatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
-import edu.uci.ics.hyracks.api.job.JobSpecification;
+import edu.uci.ics.hyracks.api.job.IOperatorDescriptorRegistry;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.FrameTupleReference;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
 import edu.uci.ics.hyracks.dataflow.std.join.NestedLoopJoinOperatorDescriptor;
 
 /**
- * 
  * Left input is broadcast and preserves its local properties.
- * 
  * Right input can be partitioned in any way.
- * 
  */
 public class NLJoinPOperator extends AbstractJoinPOperator {
 
@@ -130,7 +127,7 @@
                 context.getTypeEnvironment(op), conditionInputSchemas, context);
         ITuplePairComparatorFactory comparatorFactory = new TuplePairEvaluatorFactory(cond,
                 context.getBinaryBooleanInspector());
-        JobSpecification spec = builder.getJobSpec();
+        IOperatorDescriptorRegistry spec = builder.getJobSpec();
         IOperatorDescriptor opDesc = null;
 
         switch (kind) {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/NestedTupleSourcePOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/NestedTupleSourcePOperator.java
index 5a4a204..c069816 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/NestedTupleSourcePOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/NestedTupleSourcePOperator.java
@@ -16,6 +16,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -26,10 +27,9 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenHelper;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std.NestedTupleSourceRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenHelper;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.std.NestedTupleSourceRuntimeFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 
 public class NestedTupleSourcePOperator extends AbstractPhysicalOperator {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/OneToOneExchangePOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/OneToOneExchangePOperator.java
index 0ed17d8..eb4fffa 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/OneToOneExchangePOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/OneToOneExchangePOperator.java
@@ -14,6 +14,7 @@
  */
 package edu.uci.ics.hyracks.algebricks.core.algebra.operators.physical;
 
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder.TargetConstraint;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -23,10 +24,9 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
 import edu.uci.ics.hyracks.api.dataflow.IConnectorDescriptor;
-import edu.uci.ics.hyracks.api.job.JobSpecification;
+import edu.uci.ics.hyracks.api.job.IConnectorDescriptorRegistry;
 import edu.uci.ics.hyracks.dataflow.std.connectors.OneToOneConnectorDescriptor;
 
 public class OneToOneExchangePOperator extends AbstractExchangePOperator {
@@ -52,7 +52,7 @@
     }
 
     @Override
-    public Pair<IConnectorDescriptor, TargetConstraint> createConnectorDescriptor(JobSpecification spec,
+    public Pair<IConnectorDescriptor, TargetConstraint> createConnectorDescriptor(IConnectorDescriptorRegistry spec,
             ILogicalOperator op, IOperatorSchema opSchema, JobGenContext context) {
         IConnectorDescriptor conn = new OneToOneConnectorDescriptor(spec);
         return new Pair<IConnectorDescriptor, TargetConstraint>(conn, TargetConstraint.SAME_COUNT);
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/PreSortedDistinctByPOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/PreSortedDistinctByPOperator.java
index 5de0165..a5597ae 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/PreSortedDistinctByPOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/PreSortedDistinctByPOperator.java
@@ -17,6 +17,8 @@
 import java.util.ArrayList;
 import java.util.List;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.ListSet;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -35,17 +37,15 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.UnorderedPartitionedProperty;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IAggregateFunctionFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenHelper;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.aggreg.SimpleAlgebricksAccumulatingAggregatorFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.ListSet;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenHelper;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IAggregateFunctionFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.aggreg.SimpleAlgebricksAccumulatingAggregatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
-import edu.uci.ics.hyracks.api.job.JobSpecification;
+import edu.uci.ics.hyracks.api.job.IOperatorDescriptorRegistry;
 import edu.uci.ics.hyracks.dataflow.std.group.IAggregatorDescriptorFactory;
-import edu.uci.ics.hyracks.dataflow.std.group.PreclusteredGroupOperatorDescriptor;
+import edu.uci.ics.hyracks.dataflow.std.group.preclustered.PreclusteredGroupOperatorDescriptor;
 
 public class PreSortedDistinctByPOperator extends AbstractPhysicalOperator {
 
@@ -94,7 +94,7 @@
             IOperatorSchema opSchema, IOperatorSchema[] inputSchemas, IOperatorSchema outerPlanSchema)
             throws AlgebricksException {
 
-        JobSpecification spec = builder.getJobSpec();
+        IOperatorDescriptorRegistry spec = builder.getJobSpec();
         int keys[] = JobGenHelper.variablesToFieldIndexes(columnList, inputSchemas[0]);
         int sz = inputSchemas[0].getSize();
         int fdSz = sz - columnList.size();
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/PreclusteredGroupByPOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/PreclusteredGroupByPOperator.java
index bb19bb9..2d4537f 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/PreclusteredGroupByPOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/PreclusteredGroupByPOperator.java
@@ -18,6 +18,8 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
@@ -28,17 +30,15 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.GroupByOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.AlgebricksPipeline;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenHelper;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.aggreg.NestedPlansAccumulatingAggregatorFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenHelper;
+import edu.uci.ics.hyracks.algebricks.runtime.base.AlgebricksPipeline;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.aggreg.NestedPlansAccumulatingAggregatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
-import edu.uci.ics.hyracks.api.job.JobSpecification;
+import edu.uci.ics.hyracks.api.job.IOperatorDescriptorRegistry;
 import edu.uci.ics.hyracks.dataflow.std.group.IAggregatorDescriptorFactory;
-import edu.uci.ics.hyracks.dataflow.std.group.PreclusteredGroupOperatorDescriptor;
+import edu.uci.ics.hyracks.dataflow.std.group.preclustered.PreclusteredGroupOperatorDescriptor;
 
 public class PreclusteredGroupByPOperator extends AbstractPreclusteredGroupByPOperator {
 
@@ -79,7 +79,7 @@
         IAggregatorDescriptorFactory aggregatorFactory = new NestedPlansAccumulatingAggregatorFactory(subplans, keys,
                 fdColumns);
 
-        JobSpecification spec = builder.getJobSpec();
+        IOperatorDescriptorRegistry spec = builder.getJobSpec();
         IBinaryComparatorFactory[] comparatorFactories = JobGenHelper.variablesToAscBinaryComparatorFactories(
                 columnList, context.getTypeEnvironment(op), context);
         RecordDescriptor recordDescriptor = JobGenHelper.mkRecordDescriptor(op, opSchema, context);
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/RandomMergeExchangePOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/RandomMergeExchangePOperator.java
index abfa31f..22d8cc3 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/RandomMergeExchangePOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/RandomMergeExchangePOperator.java
@@ -16,20 +16,20 @@
 
 import java.util.ArrayList;
 
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder.TargetConstraint;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.PhysicalOperatorTag;
-import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder.TargetConstraint;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.ILocalStructuralProperty;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPartitioningProperty;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
 import edu.uci.ics.hyracks.api.dataflow.IConnectorDescriptor;
-import edu.uci.ics.hyracks.api.job.JobSpecification;
+import edu.uci.ics.hyracks.api.job.IConnectorDescriptorRegistry;
 import edu.uci.ics.hyracks.dataflow.std.connectors.MToNReplicatingConnectorDescriptor;
 
 public class RandomMergeExchangePOperator extends AbstractExchangePOperator {
@@ -52,7 +52,7 @@
     }
 
     @Override
-    public Pair<IConnectorDescriptor, TargetConstraint> createConnectorDescriptor(JobSpecification spec,
+    public Pair<IConnectorDescriptor, TargetConstraint> createConnectorDescriptor(IConnectorDescriptorRegistry spec,
             ILogicalOperator op, IOperatorSchema opSchema, JobGenContext context) {
         IConnectorDescriptor conn = new MToNReplicatingConnectorDescriptor(spec);
         return new Pair<IConnectorDescriptor, TargetConstraint>(conn, TargetConstraint.ONE);
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/RangePartitionPOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/RangePartitionPOperator.java
index ff558ec..7e3c935 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/RangePartitionPOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/RangePartitionPOperator.java
@@ -17,10 +17,13 @@
 import java.util.ArrayList;
 import java.util.LinkedList;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.NotImplementedException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder.TargetConstraint;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.PhysicalOperatorTag;
-import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder.TargetConstraint;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.ILocalStructuralProperty;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.INodeDomain;
@@ -30,12 +33,9 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.OrderedPartitionedProperty;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.NotImplementedException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
 import edu.uci.ics.hyracks.api.dataflow.IConnectorDescriptor;
-import edu.uci.ics.hyracks.api.job.JobSpecification;
+import edu.uci.ics.hyracks.api.job.IConnectorDescriptorRegistry;
 
 public class RangePartitionPOperator extends AbstractExchangePOperator {
 
@@ -65,7 +65,7 @@
     }
 
     @Override
-    public Pair<IConnectorDescriptor, TargetConstraint> createConnectorDescriptor(JobSpecification spec,
+    public Pair<IConnectorDescriptor, TargetConstraint> createConnectorDescriptor(IConnectorDescriptorRegistry spec,
             ILogicalOperator op, IOperatorSchema opSchema, JobGenContext context) throws AlgebricksException {
         throw new NotImplementedException();
     }
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/ReplicatePOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/ReplicatePOperator.java
index b42dd5b..f076c58 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/ReplicatePOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/ReplicatePOperator.java
@@ -14,6 +14,7 @@
  */
 package edu.uci.ics.hyracks.algebricks.core.algebra.operators.physical;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -24,11 +25,10 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenHelper;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenHelper;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
-import edu.uci.ics.hyracks.api.job.JobSpecification;
+import edu.uci.ics.hyracks.api.job.IOperatorDescriptorRegistry;
 import edu.uci.ics.hyracks.dataflow.std.misc.SplitOperatorDescriptor;
 
 public class ReplicatePOperator extends AbstractPhysicalOperator {
@@ -59,7 +59,7 @@
     public void contributeRuntimeOperator(IHyracksJobBuilder builder, JobGenContext context, ILogicalOperator op,
             IOperatorSchema propagatedSchema, IOperatorSchema[] inputSchemas, IOperatorSchema outerPlanSchema)
             throws AlgebricksException {
-        JobSpecification spec = builder.getJobSpec();
+        IOperatorDescriptorRegistry spec = builder.getJobSpec();
         RecordDescriptor recDescriptor = JobGenHelper.mkRecordDescriptor(op, propagatedSchema, context);
 
         ReplicateOperator rop = (ReplicateOperator) op;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/RunningAggregatePOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/RunningAggregatePOperator.java
index 3647deb..2273cf5 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/RunningAggregatePOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/RunningAggregatePOperator.java
@@ -18,6 +18,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
@@ -34,11 +35,10 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IRunningAggregateFunctionFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenHelper;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std.RunningAggregateRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenHelper;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IRunningAggregateFunctionFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.std.RunningAggregateRuntimeFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 
 public class RunningAggregatePOperator extends AbstractPhysicalOperator {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/SinkPOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/SinkPOperator.java
index 0375246..92452f6 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/SinkPOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/SinkPOperator.java
@@ -14,6 +14,7 @@
  */
 package edu.uci.ics.hyracks.algebricks.core.algebra.operators.physical;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -23,10 +24,9 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenHelper;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base.SinkRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenHelper;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.base.SinkRuntimeFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 
 public class SinkPOperator extends AbstractPhysicalOperator {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/SinkWritePOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/SinkWritePOperator.java
index 123b0e1..a556699 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/SinkWritePOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/SinkWritePOperator.java
@@ -16,6 +16,10 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.constraints.AlgebricksPartitionConstraint;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.NotImplementedException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
@@ -23,7 +27,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalExpressionTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.PhysicalOperatorTag;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IPrinterFactory;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.VariableReferenceExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.metadata.IDataSink;
 import edu.uci.ics.hyracks.algebricks.core.algebra.metadata.IMetadataProvider;
@@ -34,13 +37,10 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IPushRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenHelper;
-import edu.uci.ics.hyracks.algebricks.core.api.constraints.AlgebricksPartitionConstraint;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.NotImplementedException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenHelper;
+import edu.uci.ics.hyracks.algebricks.data.IPrinterFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IPushRuntimeFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 
 public class SinkWritePOperator extends AbstractPhysicalOperator {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/SortMergeExchangePOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/SortMergeExchangePOperator.java
index 98c9be3..19d6c79 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/SortMergeExchangePOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/SortMergeExchangePOperator.java
@@ -17,15 +17,16 @@
 import java.util.ArrayList;
 import java.util.List;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder.TargetConstraint;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.PhysicalOperatorTag;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IBinaryComparatorFactoryProvider;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IBinaryHashFunctionFactoryProvider;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.OrderOperator.IOrder.OrderKind;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.ILocalStructuralProperty;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.ILocalStructuralProperty.PropertyType;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPartitioningProperty;
@@ -35,14 +36,14 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.OrderColumn;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.data.IBinaryComparatorFactoryProvider;
+import edu.uci.ics.hyracks.algebricks.data.IBinaryHashFunctionFactoryProvider;
 import edu.uci.ics.hyracks.api.dataflow.IConnectorDescriptor;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryHashFunctionFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ITuplePartitionComputerFactory;
-import edu.uci.ics.hyracks.api.job.JobSpecification;
+import edu.uci.ics.hyracks.api.job.IConnectorDescriptorRegistry;
 import edu.uci.ics.hyracks.dataflow.common.data.partition.FieldHashPartitionComputerFactory;
 import edu.uci.ics.hyracks.dataflow.std.connectors.MToNPartitioningMergingConnectorDescriptor;
 
@@ -120,7 +121,7 @@
     }
 
     @Override
-    public Pair<IConnectorDescriptor, TargetConstraint> createConnectorDescriptor(JobSpecification spec,
+    public Pair<IConnectorDescriptor, TargetConstraint> createConnectorDescriptor(IConnectorDescriptorRegistry spec,
             ILogicalOperator op, IOperatorSchema opSchema, JobGenContext context) throws AlgebricksException {
         int n = sortColumns.length;
         int[] sortFields = new int[n];
@@ -131,7 +132,7 @@
             sortFields[i] = opSchema.findVariable(sortColumns[i].getColumn());
             Object type = env.getVarType(sortColumns[i].getColumn());
             IBinaryComparatorFactoryProvider bcfp = context.getBinaryComparatorFactoryProvider();
-            comps[i] = bcfp.getBinaryComparatorFactory(type, sortColumns[i].getOrder());
+            comps[i] = bcfp.getBinaryComparatorFactory(type, sortColumns[i].getOrder() == OrderKind.ASC);
             IBinaryHashFunctionFactoryProvider bhffp = context.getBinaryHashFunctionFactoryProvider();
             hashFuns[i] = bhffp.getBinaryHashFunctionFactory(type);
         }
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/StableSortPOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/StableSortPOperator.java
index 73c7dd6..9ae44c7 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/StableSortPOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/StableSortPOperator.java
@@ -14,32 +14,29 @@
  */
 package edu.uci.ics.hyracks.algebricks.core.algebra.operators.physical;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.PhysicalOperatorTag;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IBinaryComparatorFactoryProvider;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.INormalizedKeyComputerFactoryProvider;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.OrderOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.OrderOperator.IOrder.OrderKind;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.OrderColumn;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenHelper;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenHelper;
+import edu.uci.ics.hyracks.algebricks.data.IBinaryComparatorFactoryProvider;
+import edu.uci.ics.hyracks.algebricks.data.INormalizedKeyComputerFactoryProvider;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.INormalizedKeyComputerFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
-import edu.uci.ics.hyracks.api.job.JobSpecification;
+import edu.uci.ics.hyracks.api.job.IOperatorDescriptorRegistry;
 import edu.uci.ics.hyracks.dataflow.std.sort.ExternalSortOperatorDescriptor;
 
 /**
- * 
  * This will always be attached to an {@link OrderOperator} logical operator.
- * 
- * 
  */
 
 public class StableSortPOperator extends AbstractStableSortPOperator {
@@ -65,7 +62,7 @@
     public void contributeRuntimeOperator(IHyracksJobBuilder builder, JobGenContext context, ILogicalOperator op,
             IOperatorSchema opSchema, IOperatorSchema[] inputSchemas, IOperatorSchema outerPlanSchema)
             throws AlgebricksException {
-        JobSpecification spec = builder.getJobSpec();
+        IOperatorDescriptorRegistry spec = builder.getJobSpec();
         RecordDescriptor recDescriptor = JobGenHelper.mkRecordDescriptor(op, opSchema, context);
         int n = sortColumns.length;
         int[] sortFields = new int[n];
@@ -82,10 +79,10 @@
             Object type = env.getVarType(var);
             OrderKind order = oc.getOrder();
             if (i == 0 && nkcfProvider != null && type != null) {
-                nkcf = nkcfProvider.getNormalizedKeyComputerFactory(type, order);
+                nkcf = nkcfProvider.getNormalizedKeyComputerFactory(type, order == OrderKind.ASC);
             }
             IBinaryComparatorFactoryProvider bcfp = context.getBinaryComparatorFactoryProvider();
-            comps[i] = bcfp.getBinaryComparatorFactory(type, oc.getOrder());
+            comps[i] = bcfp.getBinaryComparatorFactory(type, oc.getOrder() == OrderKind.ASC);
             i++;
         }
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/StreamDiePOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/StreamDiePOperator.java
index 82ea31c..55223c2 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/StreamDiePOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/StreamDiePOperator.java
@@ -14,6 +14,7 @@
  */
 package edu.uci.ics.hyracks.algebricks.core.algebra.operators.physical;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -26,11 +27,10 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluatorFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenHelper;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std.StreamDieRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenHelper;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.std.StreamDieRuntimeFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 
 public class StreamDiePOperator extends AbstractPhysicalOperator {
@@ -69,8 +69,8 @@
         DieOperator die = (DieOperator) op;
         ILogicalExpressionJobGen exprJobGen = context.getExpressionJobGen();
         IVariableTypeEnvironment env = context.getTypeEnvironment(op);
-        IEvaluatorFactory afterObjectsFact = exprJobGen.createEvaluatorFactory(die.getAfterObjects().getValue(),
-                env, inputSchemas, context);
+        IEvaluatorFactory afterObjectsFact = exprJobGen.createEvaluatorFactory(die.getAfterObjects().getValue(), env,
+                inputSchemas, context);
         RecordDescriptor recDesc = JobGenHelper.mkRecordDescriptor(op, propagatedSchema, context);
         StreamDieRuntimeFactory runtime = new StreamDieRuntimeFactory(afterObjectsFact, null,
                 context.getBinaryIntegerInspector());
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/StreamLimitPOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/StreamLimitPOperator.java
index a31b2da..1551fc7 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/StreamLimitPOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/StreamLimitPOperator.java
@@ -14,6 +14,7 @@
  */
 package edu.uci.ics.hyracks.algebricks.core.algebra.operators.physical;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
@@ -28,11 +29,10 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluatorFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenHelper;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std.StreamLimitRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenHelper;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.std.StreamLimitRuntimeFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 
 public class StreamLimitPOperator extends AbstractPhysicalOperator {
@@ -78,8 +78,8 @@
         LimitOperator limit = (LimitOperator) op;
         ILogicalExpressionJobGen exprJobGen = context.getExpressionJobGen();
         IVariableTypeEnvironment env = context.getTypeEnvironment(op);
-        IEvaluatorFactory maxObjectsFact = exprJobGen.createEvaluatorFactory(limit.getMaxObjects().getValue(),
-                env, inputSchemas, context);
+        IEvaluatorFactory maxObjectsFact = exprJobGen.createEvaluatorFactory(limit.getMaxObjects().getValue(), env,
+                inputSchemas, context);
         ILogicalExpression offsetExpr = limit.getOffset().getValue();
         IEvaluatorFactory offsetFact = (offsetExpr == null) ? null : exprJobGen.createEvaluatorFactory(offsetExpr, env,
                 inputSchemas, context);
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/StreamProjectPOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/StreamProjectPOperator.java
index 94e2135..f454b8f 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/StreamProjectPOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/StreamProjectPOperator.java
@@ -14,6 +14,7 @@
  */
 package edu.uci.ics.hyracks.algebricks.core.algebra.operators.physical;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -23,10 +24,9 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ProjectOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenHelper;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std.StreamProjectRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenHelper;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.std.StreamProjectRuntimeFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 
 public class StreamProjectPOperator extends AbstractPropagatePropertiesForUsedVariablesPOperator {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/StreamSelectPOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/StreamSelectPOperator.java
index b4112c8..0205882 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/StreamSelectPOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/StreamSelectPOperator.java
@@ -14,6 +14,7 @@
  */
 package edu.uci.ics.hyracks.algebricks.core.algebra.operators.physical;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -23,11 +24,10 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SelectOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluatorFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenHelper;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std.StreamSelectRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenHelper;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.std.StreamSelectRuntimeFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 
 public class StreamSelectPOperator extends AbstractPhysicalOperator {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/StringStreamingScriptPOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/StringStreamingScriptPOperator.java
index dfab5ed..b251c7d 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/StringStreamingScriptPOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/StringStreamingScriptPOperator.java
@@ -14,6 +14,7 @@
  */
 package edu.uci.ics.hyracks.algebricks.core.algebra.operators.physical;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -22,13 +23,12 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ScriptOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenHelper;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std.StringStreamingRuntimeFactory;
 import edu.uci.ics.hyracks.algebricks.core.algebra.scripting.IScriptDescription;
 import edu.uci.ics.hyracks.algebricks.core.algebra.scripting.IScriptDescription.ScriptKind;
 import edu.uci.ics.hyracks.algebricks.core.algebra.scripting.StringStreamingScriptDescription;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenHelper;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.std.StringStreamingRuntimeFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 
 public class StringStreamingScriptPOperator extends AbstractPropagatePropertiesForUsedVariablesPOperator {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/SubplanPOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/SubplanPOperator.java
index 4e6ef69..df84641 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/SubplanPOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/SubplanPOperator.java
@@ -19,6 +19,8 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.NotImplementedException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
@@ -31,12 +33,10 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.AlgebricksPipeline;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenHelper;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.meta.SubplanRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.NotImplementedException;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenHelper;
+import edu.uci.ics.hyracks.algebricks.runtime.base.AlgebricksPipeline;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.meta.SubplanRuntimeFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.INullWriterFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/UnionAllPOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/UnionAllPOperator.java
index da88dd9..5322ed3 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/UnionAllPOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/UnionAllPOperator.java
@@ -16,6 +16,8 @@
 
 import java.util.ArrayList;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Triple;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -30,12 +32,10 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenHelper;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Triple;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenHelper;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
-import edu.uci.ics.hyracks.api.job.JobSpecification;
+import edu.uci.ics.hyracks.api.job.IOperatorDescriptorRegistry;
 import edu.uci.ics.hyracks.dataflow.std.union.UnionAllOperatorDescriptor;
 
 public class UnionAllPOperator extends AbstractPhysicalOperator {
@@ -84,7 +84,7 @@
             ++i;
         }
 
-        JobSpecification spec = builder.getJobSpec();
+        IOperatorDescriptorRegistry spec = builder.getJobSpec();
         RecordDescriptor recordDescriptor = JobGenHelper.mkRecordDescriptor(op, opSchema, context);
 
         // at algebricks level, union all only accepts two inputs, although at
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/UnnestPOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/UnnestPOperator.java
index 8f838ba..58084ec 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/UnnestPOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/UnnestPOperator.java
@@ -14,6 +14,7 @@
  */
 package edu.uci.ics.hyracks.algebricks.core.algebra.operators.physical;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
@@ -27,11 +28,10 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.UnnestOperator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IUnnestingFunctionFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenHelper;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std.UnnestRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenHelper;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IUnnestingFunctionFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.std.UnnestRuntimeFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 
 public class UnnestPOperator extends AbstractScanPOperator {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/WriteResultPOperator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/WriteResultPOperator.java
index d1f0340..547fe843 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/WriteResultPOperator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/operators/physical/WriteResultPOperator.java
@@ -3,6 +3,9 @@
 import java.util.ArrayList;
 import java.util.List;
 
+import edu.uci.ics.hyracks.algebricks.common.constraints.AlgebricksPartitionConstraint;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -17,10 +20,7 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.api.constraints.AlgebricksPartitionConstraint;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
 import edu.uci.ics.hyracks.api.dataflow.IOperatorDescriptor;
 import edu.uci.ics.hyracks.api.job.JobSpecification;
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/prettyprint/LogicalOperatorPrettyPrintVisitor.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/prettyprint/LogicalOperatorPrettyPrintVisitor.java
index 05ae1ec..9ab1a5e 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/prettyprint/LogicalOperatorPrettyPrintVisitor.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/prettyprint/LogicalOperatorPrettyPrintVisitor.java
@@ -18,6 +18,9 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.common.utils.Triple;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
@@ -52,9 +55,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.WriteOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.WriteResultOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
-import edu.uci.ics.hyracks.algebricks.core.utils.Triple;
 
 public class LogicalOperatorPrettyPrintVisitor implements ILogicalOperatorVisitor<String, Integer> {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/prettyprint/PlanPrettyPrinter.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/prettyprint/PlanPrettyPrinter.java
index 174db0b..aa96513 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/prettyprint/PlanPrettyPrinter.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/prettyprint/PlanPrettyPrinter.java
@@ -16,12 +16,12 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IPhysicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractOperatorWithNestedPlans;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class PlanPrettyPrinter {
     public static void printPlan(ILogicalPlan plan, StringBuilder out, LogicalOperatorPrettyPrintVisitor pvisitor,
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/properties/AbstractGroupingProperty.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/properties/AbstractGroupingProperty.java
index 76d6bfe..341b4f0 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/properties/AbstractGroupingProperty.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/properties/AbstractGroupingProperty.java
@@ -18,9 +18,9 @@
 import java.util.Map;
 import java.util.Set;
 
+import edu.uci.ics.hyracks.algebricks.common.utils.ListSet;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.EquivalenceClass;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
-import edu.uci.ics.hyracks.algebricks.core.utils.ListSet;
 
 public abstract class AbstractGroupingProperty {
     protected Set<LogicalVariable> columnSet;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/properties/IPartitioningRequirementsCoordinator.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/properties/IPartitioningRequirementsCoordinator.java
index 1230196..209f1e8 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/properties/IPartitioningRequirementsCoordinator.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/properties/IPartitioningRequirementsCoordinator.java
@@ -17,20 +17,18 @@
 import java.util.Map;
 import java.util.Set;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.NotImplementedException;
+import edu.uci.ics.hyracks.algebricks.common.utils.ListSet;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.EquivalenceClass;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.NotImplementedException;
-import edu.uci.ics.hyracks.algebricks.core.utils.ListSet;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
 
 /**
- * 
  * Implements constraints in between requirements for the children of the same
  * operator.
- * 
  */
 
 public interface IPartitioningRequirementsCoordinator {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/properties/PropertiesUtil.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/properties/PropertiesUtil.java
index e1640c3..8ca4ccf 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/properties/PropertiesUtil.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/properties/PropertiesUtil.java
@@ -23,10 +23,10 @@
 import java.util.Map;
 import java.util.Set;
 
+import edu.uci.ics.hyracks.algebricks.common.utils.ListSet;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.EquivalenceClass;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.ILocalStructuralProperty.PropertyType;
-import edu.uci.ics.hyracks.algebricks.core.utils.ListSet;
 
 public class PropertiesUtil {
 
@@ -180,7 +180,6 @@
     }
 
     /**
-     * 
      * @param pref
      * @param target
      * @return true iff pref is a prefix of target
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/properties/TypePropagationPolicy.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/properties/TypePropagationPolicy.java
index 6b14a9f..01c2de4 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/properties/TypePropagationPolicy.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/properties/TypePropagationPolicy.java
@@ -2,11 +2,11 @@
 
 import java.util.List;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.INullableTypeComputer;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment;
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypeEnvPointer;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public abstract class TypePropagationPolicy {
     public static final TypePropagationPolicy ALL = new TypePropagationPolicy() {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/properties/VariablePropagationPolicy.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/properties/VariablePropagationPolicy.java
index 6f936c0..f9c4ac3 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/properties/VariablePropagationPolicy.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/properties/VariablePropagationPolicy.java
@@ -14,9 +14,9 @@
  */
 package edu.uci.ics.hyracks.algebricks.core.algebra.properties;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public abstract class VariablePropagationPolicy {
     public static final VariablePropagationPolicy ALL = new VariablePropagationPolicy() {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/ISerializableAggregateFunctionFactory.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/ISerializableAggregateFunctionFactory.java
deleted file mode 100644
index f9f871e..0000000
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/ISerializableAggregateFunctionFactory.java
+++ /dev/null
@@ -1,9 +0,0 @@
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base;
-
-import java.io.Serializable;
-
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-
-public interface ISerializableAggregateFunctionFactory extends Serializable {
-    public ISerializableAggregateFunction createAggregateFunction() throws AlgebricksException;
-}
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/scripting/IScriptDescription.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/scripting/IScriptDescription.java
index f292dd7..89f40d6 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/scripting/IScriptDescription.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/scripting/IScriptDescription.java
@@ -16,8 +16,8 @@
 
 import java.util.List;
 
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
 
 public interface IScriptDescription {
     public enum ScriptKind {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/scripting/StringStreamingScriptDescription.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/scripting/StringStreamingScriptDescription.java
index 64cea03..f41535f 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/scripting/StringStreamingScriptDescription.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/scripting/StringStreamingScriptDescription.java
@@ -16,9 +16,9 @@
 
 import java.util.List;
 
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IPrinterFactory;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.data.IPrinterFactory;
 import edu.uci.ics.hyracks.dataflow.std.file.ITupleParserFactory;
 
 public class StringStreamingScriptDescription implements IScriptDescription {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/typing/AbstractTypeEnvironment.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/typing/AbstractTypeEnvironment.java
index d1ebbab..e0217a9 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/typing/AbstractTypeEnvironment.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/typing/AbstractTypeEnvironment.java
@@ -3,12 +3,12 @@
 import java.util.HashMap;
 import java.util.Map;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IExpressionTypeComputer;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment;
 import edu.uci.ics.hyracks.algebricks.core.algebra.metadata.IMetadataProvider;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public abstract class AbstractTypeEnvironment implements IVariableTypeEnvironment {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/typing/NonPropagatingTypeEnvironment.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/typing/NonPropagatingTypeEnvironment.java
index e0f4e16..00cbac8 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/typing/NonPropagatingTypeEnvironment.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/typing/NonPropagatingTypeEnvironment.java
@@ -2,10 +2,10 @@
 
 import java.util.List;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IExpressionTypeComputer;
 import edu.uci.ics.hyracks.algebricks.core.algebra.metadata.IMetadataProvider;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class NonPropagatingTypeEnvironment extends AbstractTypeEnvironment {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/typing/PropagateOperatorInputsTypeEnvironment.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/typing/PropagateOperatorInputsTypeEnvironment.java
index 15504cb..5a42caf 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/typing/PropagateOperatorInputsTypeEnvironment.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/typing/PropagateOperatorInputsTypeEnvironment.java
@@ -5,12 +5,12 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IExpressionTypeComputer;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment;
 import edu.uci.ics.hyracks.algebricks.core.algebra.metadata.IMetadataProvider;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class PropagateOperatorInputsTypeEnvironment extends AbstractTypeEnvironment {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/typing/PropagatingTypeEnvironment.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/typing/PropagatingTypeEnvironment.java
index bb2db54..d73e89f 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/typing/PropagatingTypeEnvironment.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/typing/PropagatingTypeEnvironment.java
@@ -3,12 +3,12 @@
 import java.util.ArrayList;
 import java.util.List;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IExpressionTypeComputer;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.INullableTypeComputer;
 import edu.uci.ics.hyracks.algebricks.core.algebra.metadata.IMetadataProvider;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.TypePropagationPolicy;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class PropagatingTypeEnvironment extends AbstractTypeEnvironment {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/util/OperatorManipulationUtil.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/util/OperatorManipulationUtil.java
index 4604198..47a979c 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/util/OperatorManipulationUtil.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/util/OperatorManipulationUtil.java
@@ -19,6 +19,7 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -32,7 +33,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SubplanOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.visitors.VariableUtilities;
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class OperatorManipulationUtil {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/util/OperatorPropertiesUtil.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/util/OperatorPropertiesUtil.java
index 3fe8bc2..cd8f042 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/util/OperatorPropertiesUtil.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/util/OperatorPropertiesUtil.java
@@ -20,6 +20,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
@@ -34,7 +35,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractOperatorWithNestedPlans;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SelectOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.visitors.VariableUtilities;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class OperatorPropertiesUtil {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/visitors/AbstractConstVarFunVisitor.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/visitors/AbstractConstVarFunVisitor.java
index d4c5530..fac5052 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/visitors/AbstractConstVarFunVisitor.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/visitors/AbstractConstVarFunVisitor.java
@@ -14,12 +14,12 @@
  */
 package edu.uci.ics.hyracks.algebricks.core.algebra.visitors;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.AbstractFunctionCallExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.AggregateFunctionCallExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.ScalarFunctionCallExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.StatefulFunctionCallExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.UnnestingFunctionCallExpression;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public abstract class AbstractConstVarFunVisitor<R, T> implements ILogicalExpressionVisitor<R, T> {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/visitors/ILogicalExpressionReferenceTransform.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/visitors/ILogicalExpressionReferenceTransform.java
index 2ad942a..a5808b1 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/visitors/ILogicalExpressionReferenceTransform.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/visitors/ILogicalExpressionReferenceTransform.java
@@ -16,8 +16,8 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public interface ILogicalExpressionReferenceTransform {
     // returns true if any change is made to the expression
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/visitors/ILogicalExpressionVisitor.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/visitors/ILogicalExpressionVisitor.java
index a299574..d64b6ae 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/visitors/ILogicalExpressionVisitor.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/visitors/ILogicalExpressionVisitor.java
@@ -14,13 +14,13 @@
  */
 package edu.uci.ics.hyracks.algebricks.core.algebra.visitors;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.AggregateFunctionCallExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.ConstantExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.ScalarFunctionCallExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.StatefulFunctionCallExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.UnnestingFunctionCallExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.VariableReferenceExpression;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public interface ILogicalExpressionVisitor<R, T> {
     public R visitConstantExpression(ConstantExpression expr, T arg) throws AlgebricksException;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/visitors/ILogicalOperatorVisitor.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/visitors/ILogicalOperatorVisitor.java
index bfc7acc..93633c8 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/visitors/ILogicalOperatorVisitor.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/visitors/ILogicalOperatorVisitor.java
@@ -14,6 +14,7 @@
  */
 package edu.uci.ics.hyracks.algebricks.core.algebra.visitors;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AggregateOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AssignOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.DataSourceScanOperator;
@@ -42,7 +43,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.UnnestOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.WriteOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.WriteResultOperator;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public interface ILogicalOperatorVisitor<R, T> {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/jobgen/impl/ConnectorPolicyAssignmentPolicy.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/jobgen/impl/ConnectorPolicyAssignmentPolicy.java
new file mode 100644
index 0000000..e786f8c
--- /dev/null
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/jobgen/impl/ConnectorPolicyAssignmentPolicy.java
@@ -0,0 +1,24 @@
+package edu.uci.ics.hyracks.algebricks.core.jobgen.impl;
+
+import edu.uci.ics.hyracks.api.dataflow.IConnectorDescriptor;
+import edu.uci.ics.hyracks.api.dataflow.connectors.IConnectorPolicy;
+import edu.uci.ics.hyracks.api.dataflow.connectors.IConnectorPolicyAssignmentPolicy;
+import edu.uci.ics.hyracks.api.dataflow.connectors.PipeliningConnectorPolicy;
+import edu.uci.ics.hyracks.api.dataflow.connectors.SendSideMaterializedPipeliningConnectorPolicy;
+import edu.uci.ics.hyracks.dataflow.std.connectors.MToNPartitioningMergingConnectorDescriptor;
+
+public class ConnectorPolicyAssignmentPolicy implements IConnectorPolicyAssignmentPolicy {
+    private static final long serialVersionUID = 1L;
+    private IConnectorPolicy senderSideMaterializePolicy = new SendSideMaterializedPipeliningConnectorPolicy();
+    private IConnectorPolicy pipeliningPolicy = new PipeliningConnectorPolicy();
+
+    @Override
+    public IConnectorPolicy getConnectorPolicyAssignment(IConnectorDescriptor c, int nProducers, int nConsumers,
+            int[] fanouts) {
+        if (c instanceof MToNPartitioningMergingConnectorDescriptor) {
+            return senderSideMaterializePolicy;
+        } else {
+            return pipeliningPolicy;
+        }
+    }
+}
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/impl/JobBuilder.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/jobgen/impl/JobBuilder.java
similarity index 95%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/impl/JobBuilder.java
rename to hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/jobgen/impl/JobBuilder.java
index 33102cb..61625d3 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/impl/JobBuilder.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/jobgen/impl/JobBuilder.java
@@ -12,22 +12,22 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl;
+package edu.uci.ics.hyracks.algebricks.core.jobgen.impl;
 
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
+import edu.uci.ics.hyracks.algebricks.common.constraints.AlgebricksCountPartitionConstraint;
+import edu.uci.ics.hyracks.algebricks.common.constraints.AlgebricksPartitionConstraint;
+import edu.uci.ics.hyracks.algebricks.common.constraints.AlgebricksPartitionConstraintHelper;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IPushRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.meta.AlgebricksMetaOperatorDescriptor;
-import edu.uci.ics.hyracks.algebricks.core.api.constraints.AlgebricksCountPartitionConstraint;
-import edu.uci.ics.hyracks.algebricks.core.api.constraints.AlgebricksPartitionConstraint;
-import edu.uci.ics.hyracks.algebricks.core.api.constraints.AlgebricksPartitionConstraintHelper;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IPushRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.meta.AlgebricksMetaOperatorDescriptor;
 import edu.uci.ics.hyracks.api.dataflow.ConnectorDescriptorId;
 import edu.uci.ics.hyracks.api.dataflow.IConnectorDescriptor;
 import edu.uci.ics.hyracks.api.dataflow.IOperatorDescriptor;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/impl/JobGenContext.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/jobgen/impl/JobGenContext.java
similarity index 89%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/impl/JobGenContext.java
rename to hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/jobgen/impl/JobGenContext.java
index 870ce91..0312aec 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/impl/JobGenContext.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/jobgen/impl/JobGenContext.java
@@ -12,22 +12,16 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl;
+package edu.uci.ics.hyracks.algebricks.core.jobgen.impl;
 
 import java.util.HashMap;
 import java.util.Map;
 
+import edu.uci.ics.hyracks.algebricks.common.constraints.AlgebricksPartitionConstraint;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IBinaryBooleanInspector;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IBinaryComparatorFactoryProvider;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IBinaryHashFunctionFactoryProvider;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IBinaryIntegerInspector;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.INormalizedKeyComputerFactoryProvider;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IPrinterFactoryProvider;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.ISerializerDeserializerProvider;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.ITypeTraitProvider;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IExpressionEvalSizeComputer;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IExpressionTypeComputer;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.ILogicalExpressionJobGen;
@@ -37,8 +31,14 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.metadata.IMetadataProvider;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema;
 import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext;
-import edu.uci.ics.hyracks.algebricks.core.api.constraints.AlgebricksPartitionConstraint;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.data.IBinaryBooleanInspector;
+import edu.uci.ics.hyracks.algebricks.data.IBinaryComparatorFactoryProvider;
+import edu.uci.ics.hyracks.algebricks.data.IBinaryHashFunctionFactoryProvider;
+import edu.uci.ics.hyracks.algebricks.data.IBinaryIntegerInspector;
+import edu.uci.ics.hyracks.algebricks.data.INormalizedKeyComputerFactoryProvider;
+import edu.uci.ics.hyracks.algebricks.data.IPrinterFactoryProvider;
+import edu.uci.ics.hyracks.algebricks.data.ISerializerDeserializerProvider;
+import edu.uci.ics.hyracks.algebricks.data.ITypeTraitProvider;
 import edu.uci.ics.hyracks.api.dataflow.value.INullWriterFactory;
 
 public class JobGenContext {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/impl/JobGenHelper.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/jobgen/impl/JobGenHelper.java
similarity index 87%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/impl/JobGenHelper.java
rename to hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/jobgen/impl/JobGenHelper.java
index 90bf47c..63e6e63 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/impl/JobGenHelper.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/jobgen/impl/JobGenHelper.java
@@ -12,24 +12,23 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl;
+package edu.uci.ics.hyracks.algebricks.core.jobgen.impl;
 
 import java.util.Collection;
 import java.util.logging.Logger;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IBinaryComparatorFactoryProvider;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IBinaryHashFunctionFactoryProvider;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.INormalizedKeyComputerFactoryProvider;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IPrinterFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IPrinterFactoryProvider;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.ISerializerDeserializerProvider;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.ITypeTraitProvider;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema;
-import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.OrderOperator.IOrder.OrderKind;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.data.IBinaryComparatorFactoryProvider;
+import edu.uci.ics.hyracks.algebricks.data.IBinaryHashFunctionFactoryProvider;
+import edu.uci.ics.hyracks.algebricks.data.INormalizedKeyComputerFactoryProvider;
+import edu.uci.ics.hyracks.algebricks.data.IPrinterFactory;
+import edu.uci.ics.hyracks.algebricks.data.IPrinterFactoryProvider;
+import edu.uci.ics.hyracks.algebricks.data.ISerializerDeserializerProvider;
+import edu.uci.ics.hyracks.algebricks.data.ITypeTraitProvider;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryHashFunctionFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.INormalizedKeyComputerFactory;
@@ -103,7 +102,7 @@
         int i = 0;
         for (LogicalVariable v : varLogical) {
             Object type = env.getVarType(v);
-            compFactories[i++] = bcfProvider.getBinaryComparatorFactory(type, OrderKind.ASC);
+            compFactories[i++] = bcfProvider.getBinaryComparatorFactory(type, true);
         }
         return compFactories;
     }
@@ -116,7 +115,7 @@
             return null;
         for (LogicalVariable v : varLogical) {
             Object type = env.getVarType(v);
-            return nkcfProvider.getNormalizedKeyComputerFactory(type, OrderKind.ASC);
+            return nkcfProvider.getNormalizedKeyComputerFactory(type, true);
         }
         return null;
     }
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/impl/OperatorSchemaImpl.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/jobgen/impl/OperatorSchemaImpl.java
similarity index 96%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/impl/OperatorSchemaImpl.java
rename to hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/jobgen/impl/OperatorSchemaImpl.java
index 1d874f3..d8fc436 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/impl/OperatorSchemaImpl.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/jobgen/impl/OperatorSchemaImpl.java
@@ -12,7 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl;
+package edu.uci.ics.hyracks.algebricks.core.jobgen.impl;
 
 import java.util.ArrayList;
 import java.util.HashMap;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/impl/PlanCompiler.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/jobgen/impl/PlanCompiler.java
similarity index 90%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/impl/PlanCompiler.java
rename to hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/jobgen/impl/PlanCompiler.java
index ab170c9..bbe8fb3 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/impl/PlanCompiler.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/jobgen/impl/PlanCompiler.java
@@ -12,7 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl;
+package edu.uci.ics.hyracks.algebricks.core.jobgen.impl;
 
 import java.util.ArrayList;
 import java.util.HashMap;
@@ -22,11 +22,12 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.api.job.IOperatorDescriptorRegistry;
 import edu.uci.ics.hyracks.api.job.JobSpecification;
 
 public class PlanCompiler {
@@ -52,10 +53,11 @@
         reviseEdges(builder);
         operatorVisitedToParents.clear();
         builder.buildSpec(rootOps);
+        spec.setConnectorPolicyAssignmentPolicy(new ConnectorPolicyAssignmentPolicy());
         return spec;
     }
 
-    private void compileOpRef(Mutable<ILogicalOperator> opRef, JobSpecification spec, IHyracksJobBuilder builder,
+    private void compileOpRef(Mutable<ILogicalOperator> opRef, IOperatorDescriptorRegistry spec, IHyracksJobBuilder builder,
             IOperatorSchema outerPlanSchema) throws AlgebricksException {
         ILogicalOperator op = opRef.getValue();
         int n = op.getInputs().size();
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/rewriter/base/AbstractRuleController.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/rewriter/base/AbstractRuleController.java
index 1293d5b..b6b6042 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/rewriter/base/AbstractRuleController.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/rewriter/base/AbstractRuleController.java
@@ -18,6 +18,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -25,7 +26,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractOperatorWithNestedPlans;
 import edu.uci.ics.hyracks.algebricks.core.algebra.prettyprint.LogicalOperatorPrettyPrintVisitor;
 import edu.uci.ics.hyracks.algebricks.core.algebra.prettyprint.PlanPrettyPrinter;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.config.AlgebricksConfig;
 
 public abstract class AbstractRuleController {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/rewriter/base/AlgebricksOptimizationContext.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/rewriter/base/AlgebricksOptimizationContext.java
index ab436f4..7c63e01 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/rewriter/base/AlgebricksOptimizationContext.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/rewriter/base/AlgebricksOptimizationContext.java
@@ -20,6 +20,7 @@
 import java.util.List;
 import java.util.Map;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.EquivalenceClass;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -33,7 +34,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.metadata.IMetadataProvider;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.FunctionalDependency;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.ILogicalPropertiesVector;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class AlgebricksOptimizationContext implements IOptimizationContext {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/rewriter/base/HeuristicOptimizer.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/rewriter/base/HeuristicOptimizer.java
index 381f70c..e6b296b 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/rewriter/base/HeuristicOptimizer.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/rewriter/base/HeuristicOptimizer.java
@@ -4,6 +4,8 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -12,9 +14,7 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractOperatorWithNestedPlans;
 import edu.uci.ics.hyracks.algebricks.core.algebra.prettyprint.LogicalOperatorPrettyPrintVisitor;
 import edu.uci.ics.hyracks.algebricks.core.algebra.prettyprint.PlanPrettyPrinter;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.config.AlgebricksConfig;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
 
 public class HeuristicOptimizer {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/rewriter/base/IAlgebraicRewriteRule.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/rewriter/base/IAlgebraicRewriteRule.java
index bfbd636..fc39d0b 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/rewriter/base/IAlgebraicRewriteRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/rewriter/base/IAlgebraicRewriteRule.java
@@ -16,9 +16,9 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public interface IAlgebraicRewriteRule {
     public boolean rewritePre(Mutable<ILogicalOperator> opRef, IOptimizationContext context) throws AlgebricksException;
diff --git a/hyracks-algebricks/hyracks-algebricks-data/pom.xml b/hyracks-algebricks/hyracks-algebricks-data/pom.xml
new file mode 100644
index 0000000..083ef45
--- /dev/null
+++ b/hyracks-algebricks/hyracks-algebricks-data/pom.xml
@@ -0,0 +1,36 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <artifactId>hyracks-algebricks-data</artifactId>
+
+  <parent>
+    <groupId>edu.uci.ics.hyracks</groupId>
+    <artifactId>hyracks-algebricks</artifactId>
+    <version>0.2.1-SNAPSHOT</version>
+  </parent>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>2.0.2</version>
+        <configuration>
+          <source>1.6</source>
+          <target>1.6</target>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+  <dependencies>
+  <dependency>
+  	<groupId>edu.uci.ics.hyracks</groupId>
+  	<artifactId>hyracks-algebricks-common</artifactId>
+  	<version>0.2.1-SNAPSHOT</version>
+  </dependency>
+  <dependency>
+  	<groupId>edu.uci.ics.hyracks</groupId>
+  	<artifactId>hyracks-data-std</artifactId>
+  	<version>0.2.1-SNAPSHOT</version>
+  </dependency>
+  </dependencies>
+</project>
diff --git a/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/IAWriter.java b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/IAWriter.java
new file mode 100644
index 0000000..ca79526
--- /dev/null
+++ b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/IAWriter.java
@@ -0,0 +1,11 @@
+package edu.uci.ics.hyracks.algebricks.data;
+
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.api.comm.IFrameTupleAccessor;
+
+public interface IAWriter {
+
+    public void init() throws AlgebricksException;
+
+    public void printTuple(IFrameTupleAccessor tAccess, int tIdx) throws AlgebricksException;
+}
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/IAWriterFactory.java b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/IAWriterFactory.java
similarity index 84%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/IAWriterFactory.java
rename to hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/IAWriterFactory.java
index 200f58f..71f52a6 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/IAWriterFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/IAWriterFactory.java
@@ -1,4 +1,4 @@
-package edu.uci.ics.hyracks.algebricks.core.algebra.data;
+package edu.uci.ics.hyracks.algebricks.data;
 
 import java.io.PrintStream;
 import java.io.Serializable;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/IBinaryBooleanInspector.java b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/IBinaryBooleanInspector.java
similarity index 92%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/IBinaryBooleanInspector.java
rename to hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/IBinaryBooleanInspector.java
index 60e5050..88ff710 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/IBinaryBooleanInspector.java
+++ b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/IBinaryBooleanInspector.java
@@ -12,7 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.data;
+package edu.uci.ics.hyracks.algebricks.data;
 
 import java.io.Serializable;
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/IBinaryComparatorFactoryProvider.java b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/IBinaryComparatorFactoryProvider.java
similarity index 69%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/IBinaryComparatorFactoryProvider.java
rename to hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/IBinaryComparatorFactoryProvider.java
index bb4b734..3841e17 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/IBinaryComparatorFactoryProvider.java
+++ b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/IBinaryComparatorFactoryProvider.java
@@ -12,17 +12,12 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.data;
+package edu.uci.ics.hyracks.algebricks.data;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.OrderOperator.IOrder.OrderKind;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
 
 public interface IBinaryComparatorFactoryProvider {
-    /**
-     * only ASC and DESC are currently supported for orderKind (FUNCTIONCALL can
-     * be ignored)
-     */
-    public IBinaryComparatorFactory getBinaryComparatorFactory(Object type, OrderKind orderKind)
+    public IBinaryComparatorFactory getBinaryComparatorFactory(Object type, boolean ascending)
             throws AlgebricksException;
 }
\ No newline at end of file
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/IBinaryHashFunctionFactoryProvider.java b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/IBinaryHashFunctionFactoryProvider.java
similarity index 86%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/IBinaryHashFunctionFactoryProvider.java
rename to hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/IBinaryHashFunctionFactoryProvider.java
index 2e1f0fa..dd7288d 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/IBinaryHashFunctionFactoryProvider.java
+++ b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/IBinaryHashFunctionFactoryProvider.java
@@ -12,9 +12,9 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.data;
+package edu.uci.ics.hyracks.algebricks.data;
 
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryHashFunctionFactory;
 
 public interface IBinaryHashFunctionFactoryProvider {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/IBinaryIntegerInspector.java b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/IBinaryIntegerInspector.java
similarity index 92%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/IBinaryIntegerInspector.java
rename to hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/IBinaryIntegerInspector.java
index 3a2fe29..24ba948 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/IBinaryIntegerInspector.java
+++ b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/IBinaryIntegerInspector.java
@@ -12,7 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.data;
+package edu.uci.ics.hyracks.algebricks.data;
 
 import java.io.Serializable;
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/INormalizedKeyComputerFactoryProvider.java b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/INormalizedKeyComputerFactoryProvider.java
similarity index 80%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/INormalizedKeyComputerFactoryProvider.java
rename to hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/INormalizedKeyComputerFactoryProvider.java
index 1883ef5..6be0ec0 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/INormalizedKeyComputerFactoryProvider.java
+++ b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/INormalizedKeyComputerFactoryProvider.java
@@ -12,11 +12,10 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.data;
+package edu.uci.ics.hyracks.algebricks.data;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.OrderOperator.IOrder.OrderKind;
 import edu.uci.ics.hyracks.api.dataflow.value.INormalizedKeyComputerFactory;
 
 public interface INormalizedKeyComputerFactoryProvider {
-    public INormalizedKeyComputerFactory getNormalizedKeyComputerFactory(Object type, OrderKind order);
+    public INormalizedKeyComputerFactory getNormalizedKeyComputerFactory(Object type, boolean ascending);
 }
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/IPrinter.java b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/IPrinter.java
similarity index 85%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/IPrinter.java
rename to hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/IPrinter.java
index 89de415..c3f42fb 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/IPrinter.java
+++ b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/IPrinter.java
@@ -12,11 +12,11 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.data;
+package edu.uci.ics.hyracks.algebricks.data;
 
 import java.io.PrintStream;
 
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 
 public interface IPrinter {
     public void init() throws AlgebricksException;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/IPrinterFactory.java b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/IPrinterFactory.java
similarity index 92%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/IPrinterFactory.java
rename to hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/IPrinterFactory.java
index 871fe43..1a3e0d3 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/IPrinterFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/IPrinterFactory.java
@@ -12,7 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.data;
+package edu.uci.ics.hyracks.algebricks.data;
 
 import java.io.Serializable;
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/IPrinterFactoryProvider.java b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/IPrinterFactoryProvider.java
similarity index 84%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/IPrinterFactoryProvider.java
rename to hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/IPrinterFactoryProvider.java
index e2e2f1c..45a5088 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/IPrinterFactoryProvider.java
+++ b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/IPrinterFactoryProvider.java
@@ -12,9 +12,9 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.data;
+package edu.uci.ics.hyracks.algebricks.data;
 
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 
 public interface IPrinterFactoryProvider {
     public IPrinterFactory getPrinterFactory(Object type) throws AlgebricksException;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/ISerializerDeserializerProvider.java b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/ISerializerDeserializerProvider.java
similarity index 86%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/ISerializerDeserializerProvider.java
rename to hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/ISerializerDeserializerProvider.java
index 66d696c..fdd76a0 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/ISerializerDeserializerProvider.java
+++ b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/ISerializerDeserializerProvider.java
@@ -12,9 +12,9 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.data;
+package edu.uci.ics.hyracks.algebricks.data;
 
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 
 public interface ISerializerDeserializerProvider {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/ITypeTraitProvider.java b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/ITypeTraitProvider.java
similarity index 92%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/ITypeTraitProvider.java
rename to hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/ITypeTraitProvider.java
index 6ad3079..f94caea 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/data/ITypeTraitProvider.java
+++ b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/ITypeTraitProvider.java
@@ -12,7 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.data;
+package edu.uci.ics.hyracks.algebricks.data;
 
 import edu.uci.ics.hyracks.api.dataflow.value.ITypeTraits;
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/data/BinaryBooleanInspectorImpl.java b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/impl/BinaryBooleanInspectorImpl.java
similarity index 86%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/data/BinaryBooleanInspectorImpl.java
rename to hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/impl/BinaryBooleanInspectorImpl.java
index fdb3663..0d1d444 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/data/BinaryBooleanInspectorImpl.java
+++ b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/impl/BinaryBooleanInspectorImpl.java
@@ -12,9 +12,9 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.data;
+package edu.uci.ics.hyracks.algebricks.data.impl;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IBinaryBooleanInspector;
+import edu.uci.ics.hyracks.algebricks.data.IBinaryBooleanInspector;
 
 public class BinaryBooleanInspectorImpl implements IBinaryBooleanInspector {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/data/BinaryIntegerInspectorImpl.java b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/impl/BinaryIntegerInspectorImpl.java
similarity index 75%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/data/BinaryIntegerInspectorImpl.java
rename to hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/impl/BinaryIntegerInspectorImpl.java
index 9d0587d..e1016cf 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/data/BinaryIntegerInspectorImpl.java
+++ b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/impl/BinaryIntegerInspectorImpl.java
@@ -12,10 +12,10 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.data;
+package edu.uci.ics.hyracks.algebricks.data.impl;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IBinaryIntegerInspector;
-import edu.uci.ics.hyracks.dataflow.common.data.marshalling.IntegerSerializerDeserializer;
+import edu.uci.ics.hyracks.algebricks.data.IBinaryIntegerInspector;
+import edu.uci.ics.hyracks.data.std.primitive.IntegerPointable;
 
 public class BinaryIntegerInspectorImpl implements IBinaryIntegerInspector {
 
@@ -24,7 +24,7 @@
 
     @Override
     public int getIntegerValue(byte[] bytes, int offset, int length) {
-        return IntegerSerializerDeserializer.getInt(bytes, offset);
+        return IntegerPointable.getInteger(bytes, offset);
     }
 
 }
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/data/IntegerPrinterFactory.java b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/impl/IntegerPrinterFactory.java
similarity index 73%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/data/IntegerPrinterFactory.java
rename to hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/impl/IntegerPrinterFactory.java
index db47af6..fa9bb51 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/data/IntegerPrinterFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/impl/IntegerPrinterFactory.java
@@ -12,16 +12,16 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.data;
+package edu.uci.ics.hyracks.algebricks.data.impl;
 
 import java.io.IOException;
 import java.io.PrintStream;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IPrinter;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IPrinterFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.WriteValueTools;
-import edu.uci.ics.hyracks.dataflow.common.data.marshalling.IntegerSerializerDeserializer;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.data.IPrinter;
+import edu.uci.ics.hyracks.algebricks.data.IPrinterFactory;
+import edu.uci.ics.hyracks.algebricks.data.utils.WriteValueTools;
+import edu.uci.ics.hyracks.data.std.primitive.IntegerPointable;
 
 public class IntegerPrinterFactory implements IPrinterFactory {
 
@@ -37,7 +37,7 @@
 
             @Override
             public void print(byte[] b, int s, int l, PrintStream ps) throws AlgebricksException {
-                int d = IntegerSerializerDeserializer.getInt(b, s);
+                int d = IntegerPointable.getInteger(b, s);
                 try {
                     WriteValueTools.writeInt(d, ps);
                 } catch (IOException e) {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/data/NoopNullWriterFactory.java b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/impl/NoopNullWriterFactory.java
similarity index 94%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/data/NoopNullWriterFactory.java
rename to hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/impl/NoopNullWriterFactory.java
index e064832..8011091 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/data/NoopNullWriterFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/impl/NoopNullWriterFactory.java
@@ -12,7 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.data;
+package edu.uci.ics.hyracks.algebricks.data.impl;
 
 import java.io.DataOutput;
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/data/UTF8StringPrinterFactory.java b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/impl/UTF8StringPrinterFactory.java
similarity index 86%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/data/UTF8StringPrinterFactory.java
rename to hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/impl/UTF8StringPrinterFactory.java
index 4a900f1..cf6e725 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/jobgen/data/UTF8StringPrinterFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/impl/UTF8StringPrinterFactory.java
@@ -12,13 +12,13 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.data;
+package edu.uci.ics.hyracks.algebricks.data.impl;
 
 import java.io.PrintStream;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IPrinter;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IPrinterFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.data.IPrinter;
+import edu.uci.ics.hyracks.algebricks.data.IPrinterFactory;
 import edu.uci.ics.hyracks.data.std.primitive.UTF8StringPointable;
 
 public class UTF8StringPrinterFactory implements IPrinterFactory {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/utils/WriteValueTools.java b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/utils/WriteValueTools.java
similarity index 98%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/utils/WriteValueTools.java
rename to hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/utils/WriteValueTools.java
index 8ecd16b..32eec8e 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/utils/WriteValueTools.java
+++ b/hyracks-algebricks/hyracks-algebricks-data/src/main/java/edu/uci/ics/hyracks/algebricks/data/utils/WriteValueTools.java
@@ -1,4 +1,4 @@
-package edu.uci.ics.hyracks.algebricks.core.utils;
+package edu.uci.ics.hyracks.algebricks.data.utils;
 
 import java.io.IOException;
 import java.io.OutputStream;
diff --git a/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/compiler/PigletCompiler.java b/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/compiler/PigletCompiler.java
index c675d80..5a3b7d9 100644
--- a/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/compiler/PigletCompiler.java
+++ b/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/compiler/PigletCompiler.java
@@ -12,6 +12,8 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.compiler.api.HeuristicCompilerFactoryBuilder;
 import edu.uci.ics.hyracks.algebricks.compiler.api.ICompiler;
 import edu.uci.ics.hyracks.algebricks.compiler.api.ICompilerFactory;
@@ -21,7 +23,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.ISerializerDeserializerProvider;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.ConstantExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IExpressionTypeComputer;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment;
@@ -38,10 +39,9 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.plan.ALogicalPlanImpl;
 import edu.uci.ics.hyracks.algebricks.core.algebra.prettyprint.LogicalOperatorPrettyPrintVisitor;
 import edu.uci.ics.hyracks.algebricks.core.algebra.prettyprint.PlanPrettyPrinter;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.AbstractRuleController;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.data.ISerializerDeserializerProvider;
 import edu.uci.ics.hyracks.algebricks.examples.piglet.ast.ASTNode;
 import edu.uci.ics.hyracks.algebricks.examples.piglet.ast.AssignmentNode;
 import edu.uci.ics.hyracks.algebricks.examples.piglet.ast.DumpNode;
diff --git a/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/compiler/PigletPrinterFactoryProvider.java b/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/compiler/PigletPrinterFactoryProvider.java
index cb12b7d..95797bc 100644
--- a/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/compiler/PigletPrinterFactoryProvider.java
+++ b/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/compiler/PigletPrinterFactoryProvider.java
@@ -3,12 +3,12 @@
 import java.io.IOException;
 import java.io.PrintStream;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IPrinter;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IPrinterFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IPrinterFactoryProvider;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.data.IntegerPrinterFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.WriteValueTools;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.data.IPrinter;
+import edu.uci.ics.hyracks.algebricks.data.IPrinterFactory;
+import edu.uci.ics.hyracks.algebricks.data.IPrinterFactoryProvider;
+import edu.uci.ics.hyracks.algebricks.data.impl.IntegerPrinterFactory;
+import edu.uci.ics.hyracks.algebricks.data.utils.WriteValueTools;
 import edu.uci.ics.hyracks.algebricks.examples.piglet.types.Type;
 import edu.uci.ics.hyracks.dataflow.common.data.marshalling.FloatSerializerDeserializer;
 
diff --git a/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/metadata/PigletMetadataProvider.java b/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/metadata/PigletMetadataProvider.java
index 2802263..fb88dd5 100644
--- a/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/metadata/PigletMetadataProvider.java
+++ b/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/metadata/PigletMetadataProvider.java
@@ -5,8 +5,11 @@
 import java.util.List;
 import java.util.Map;
 
+import edu.uci.ics.hyracks.algebricks.common.constraints.AlgebricksAbsolutePartitionConstraint;
+import edu.uci.ics.hyracks.algebricks.common.constraints.AlgebricksPartitionConstraint;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IPrinterFactory;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.AlgebricksBuiltinFunctions;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.IFunctionInfo;
@@ -15,15 +18,12 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.metadata.IDataSourceIndex;
 import edu.uci.ics.hyracks.algebricks.core.algebra.metadata.IMetadataProvider;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IPushRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std.SinkWriterRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.writers.PrinterBasedWriterFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.constraints.AlgebricksAbsolutePartitionConstraint;
-import edu.uci.ics.hyracks.algebricks.core.api.constraints.AlgebricksPartitionConstraint;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
+import edu.uci.ics.hyracks.algebricks.data.IPrinterFactory;
 import edu.uci.ics.hyracks.algebricks.examples.piglet.types.Type;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IPushRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.std.SinkWriterRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.writers.PrinterBasedWriterFactory;
 import edu.uci.ics.hyracks.api.dataflow.IOperatorDescriptor;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
diff --git a/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/runtime/PigletExpressionJobGen.java b/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/runtime/PigletExpressionJobGen.java
index 63e6f53..739dff5 100644
--- a/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/runtime/PigletExpressionJobGen.java
+++ b/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/runtime/PigletExpressionJobGen.java
@@ -6,6 +6,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.AggregateFunctionCallExpression;
@@ -17,19 +18,18 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.UnnestingFunctionCallExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.VariableReferenceExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IAggregateFunctionFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluatorFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IRunningAggregateFunctionFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.ISerializableAggregateFunctionFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IUnnestingFunctionFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.evaluators.ColumnAccessEvalFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.evaluators.ConstantEvalFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.impl.JobGenContext;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
 import edu.uci.ics.hyracks.algebricks.examples.piglet.compiler.ConstantValue;
 import edu.uci.ics.hyracks.algebricks.examples.piglet.exceptions.PigletException;
 import edu.uci.ics.hyracks.algebricks.examples.piglet.runtime.functions.PigletFunctionRegistry;
 import edu.uci.ics.hyracks.algebricks.examples.piglet.types.Type;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IAggregateFunctionFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IRunningAggregateFunctionFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ISerializableAggregateFunctionFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IUnnestingFunctionFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.evaluators.ColumnAccessEvalFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.evaluators.ConstantEvalFactory;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.marshalling.IntegerSerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.marshalling.UTF8StringSerializerDeserializer;
diff --git a/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/runtime/functions/IPigletFunctionEvaluatorFactoryBuilder.java b/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/runtime/functions/IPigletFunctionEvaluatorFactoryBuilder.java
index 38e7615..91a879e 100644
--- a/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/runtime/functions/IPigletFunctionEvaluatorFactoryBuilder.java
+++ b/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/runtime/functions/IPigletFunctionEvaluatorFactoryBuilder.java
@@ -1,7 +1,7 @@
 package edu.uci.ics.hyracks.algebricks.examples.piglet.runtime.functions;
 
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
 
 public interface IPigletFunctionEvaluatorFactoryBuilder {
     public IEvaluatorFactory buildEvaluatorFactory(FunctionIdentifier fid, IEvaluatorFactory[] arguments);
diff --git a/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/runtime/functions/IntegerEqFunctionEvaluatorFactory.java b/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/runtime/functions/IntegerEqFunctionEvaluatorFactory.java
index d654d77..37e78a2 100644
--- a/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/runtime/functions/IntegerEqFunctionEvaluatorFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/runtime/functions/IntegerEqFunctionEvaluatorFactory.java
@@ -3,9 +3,9 @@
 import java.io.DataOutput;
 import java.io.IOException;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluatorFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
diff --git a/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/runtime/functions/PigletFunctionRegistry.java b/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/runtime/functions/PigletFunctionRegistry.java
index 5acded6..511052a 100644
--- a/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/runtime/functions/PigletFunctionRegistry.java
+++ b/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/runtime/functions/PigletFunctionRegistry.java
@@ -6,8 +6,8 @@
 
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.AlgebricksBuiltinFunctions;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluatorFactory;
 import edu.uci.ics.hyracks.algebricks.examples.piglet.exceptions.PigletException;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
 
 public class PigletFunctionRegistry {
     private static final Map<FunctionIdentifier, IPigletFunctionEvaluatorFactoryBuilder> builderMap;
diff --git a/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/types/Schema.java b/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/types/Schema.java
index ba2401c..8d6e559 100644
--- a/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/types/Schema.java
+++ b/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/java/edu/uci/ics/hyracks/algebricks/examples/piglet/types/Schema.java
@@ -2,7 +2,7 @@
 
 import java.util.List;
 
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 
 public class Schema {
     private List<Pair<String, Type>> schema;
diff --git a/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/javacc/PigletParser.jj b/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/javacc/PigletParser.jj
index 9e339e4..2541536 100644
--- a/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/javacc/PigletParser.jj
+++ b/hyracks-algebricks/hyracks-algebricks-examples/piglet-example/src/main/javacc/PigletParser.jj
@@ -23,7 +23,7 @@
 package edu.uci.ics.hyracks.algebricks.examples.piglet.parser;
 
 import java.util.*;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.examples.piglet.ast.*;
 import edu.uci.ics.hyracks.algebricks.examples.piglet.types.*;
 
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/AbstractDecorrelationRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/AbstractDecorrelationRule.java
index fe33d09..3b7fa8c 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/AbstractDecorrelationRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/AbstractDecorrelationRule.java
@@ -22,6 +22,8 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
@@ -33,9 +35,7 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.GroupByOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.FunctionalDependency;
 import edu.uci.ics.hyracks.algebricks.core.algebra.util.OperatorManipulationUtil;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.rewriter.util.PhysicalOptimizationsUtil;
 
 public abstract class AbstractDecorrelationRule implements IAlgebraicRewriteRule {
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/AbstractExtractExprRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/AbstractExtractExprRule.java
index fbacede..553165a 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/AbstractExtractExprRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/AbstractExtractExprRule.java
@@ -17,13 +17,13 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalExpressionTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AssignOperator;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 
 public abstract class AbstractExtractExprRule implements IAlgebraicRewriteRule {
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/BreakSelectIntoConjunctsRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/BreakSelectIntoConjunctsRule.java
index 55eef21..53b361b 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/BreakSelectIntoConjunctsRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/BreakSelectIntoConjunctsRule.java
@@ -20,13 +20,13 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SelectOperator;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 
 public class BreakSelectIntoConjunctsRule implements IAlgebraicRewriteRule {
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/ComplexJoinInferenceRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/ComplexJoinInferenceRule.java
index 2ac387d..4f6699a 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/ComplexJoinInferenceRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/ComplexJoinInferenceRule.java
@@ -19,6 +19,7 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
@@ -33,7 +34,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.visitors.VariableUtilities;
 import edu.uci.ics.hyracks.algebricks.core.algebra.util.OperatorManipulationUtil;
 import edu.uci.ics.hyracks.algebricks.core.algebra.util.OperatorPropertiesUtil;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 
 public class ComplexJoinInferenceRule implements IAlgebraicRewriteRule {
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/ConsolidateAssignsRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/ConsolidateAssignsRule.java
index 67e7cf0..042c0aa 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/ConsolidateAssignsRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/ConsolidateAssignsRule.java
@@ -19,6 +19,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
@@ -26,7 +27,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AssignOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.visitors.VariableUtilities;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 
 public class ConsolidateAssignsRule implements IAlgebraicRewriteRule {
@@ -37,7 +37,8 @@
     }
 
     @Override
-    public boolean rewritePost(Mutable<ILogicalOperator> opRef, IOptimizationContext context) throws AlgebricksException {
+    public boolean rewritePost(Mutable<ILogicalOperator> opRef, IOptimizationContext context)
+            throws AlgebricksException {
         AbstractLogicalOperator op = (AbstractLogicalOperator) opRef.getValue();
         if (op.getOperatorTag() != LogicalOperatorTag.ASSIGN) {
             return false;
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/ConsolidateSelectsRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/ConsolidateSelectsRule.java
index b4d4478..33ecd97 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/ConsolidateSelectsRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/ConsolidateSelectsRule.java
@@ -19,6 +19,7 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -29,7 +30,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.IFunctionInfo;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SelectOperator;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 
 public class ConsolidateSelectsRule implements IAlgebraicRewriteRule {
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/EliminateSubplanRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/EliminateSubplanRule.java
index 5c5356c..3e6ab6f 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/EliminateSubplanRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/EliminateSubplanRule.java
@@ -19,6 +19,7 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
@@ -30,7 +31,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SubplanOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.util.OperatorManipulationUtil;
 import edu.uci.ics.hyracks.algebricks.core.algebra.util.OperatorPropertiesUtil;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 
 public class EliminateSubplanRule implements IAlgebraicRewriteRule {
@@ -42,7 +42,6 @@
 
     /**
      * Eliminate Subplan above ETS
-     * 
      * and Subplan that has only ops. with one input and no free vars. (could we
      * modify it to consider free vars which are sources of Unnest or Assign, if
      * there are no aggregates?)
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/EnforceStructuralPropertiesRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/EnforceStructuralPropertiesRule.java
index 5ebaad7..de2e6af 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/EnforceStructuralPropertiesRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/EnforceStructuralPropertiesRule.java
@@ -9,6 +9,9 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.NotImplementedException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.EquivalenceClass;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
@@ -61,12 +64,9 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.UnorderedPartitionedProperty;
 import edu.uci.ics.hyracks.algebricks.core.algebra.util.OperatorPropertiesUtil;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.NotImplementedException;
 import edu.uci.ics.hyracks.algebricks.core.config.AlgebricksConfig;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.PhysicalOptimizationConfig;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.rewriter.util.PhysicalOptimizationsUtil;
 
 public class EnforceStructuralPropertiesRule implements IAlgebraicRewriteRule {
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/ExtractCommonOperatorsRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/ExtractCommonOperatorsRule.java
index 3501467..7e27b79 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/ExtractCommonOperatorsRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/ExtractCommonOperatorsRule.java
@@ -23,6 +23,7 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -41,7 +42,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.physical.OneToOneExchangePOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.physical.ReplicatePOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.physical.StreamProjectPOperator;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 
 public class ExtractCommonOperatorsRule implements IAlgebraicRewriteRule {
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/ExtractGbyExpressionsRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/ExtractGbyExpressionsRule.java
index 38032dd..8305bc9 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/ExtractGbyExpressionsRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/ExtractGbyExpressionsRule.java
@@ -16,6 +16,8 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -25,12 +27,9 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.VariableReferenceExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.GroupByOperator;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
 
 /**
  * Needed only bc. current Hyrax operators require keys to be fields.
- * 
  */
 public class ExtractGbyExpressionsRule extends AbstractExtractExprRule {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/FactorRedundantGroupAndDecorVarsRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/FactorRedundantGroupAndDecorVarsRule.java
index 99ed003..bfaff9f 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/FactorRedundantGroupAndDecorVarsRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/FactorRedundantGroupAndDecorVarsRule.java
@@ -22,6 +22,8 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -32,9 +34,7 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AssignOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.GroupByOperator;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
 
 public class FactorRedundantGroupAndDecorVarsRule implements IAlgebraicRewriteRule {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/InferTypesRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/InferTypesRule.java
index e1d5549..703567a 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/InferTypesRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/InferTypesRule.java
@@ -2,9 +2,9 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 
 public class InferTypesRule implements IAlgebraicRewriteRule {
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/InlineVariablesRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/InlineVariablesRule.java
index 0cc2b53..8a79d81 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/InlineVariablesRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/InlineVariablesRule.java
@@ -21,6 +21,8 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.EquivalenceClass;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
@@ -39,10 +41,8 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.GroupByOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ProjectOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.config.AlgebricksConfig;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
 
 public class InlineVariablesRule implements IAlgebraicRewriteRule {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/InsertOuterJoinRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/InsertOuterJoinRule.java
index 25df119..bea8817 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/InsertOuterJoinRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/InsertOuterJoinRule.java
@@ -18,6 +18,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -27,7 +28,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.LeftOuterJoinOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SubplanOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.util.OperatorPropertiesUtil;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 
 public class InsertOuterJoinRule implements IAlgebraicRewriteRule {
@@ -38,7 +38,8 @@
     }
 
     @Override
-    public boolean rewritePost(Mutable<ILogicalOperator> opRef, IOptimizationContext context) throws AlgebricksException {
+    public boolean rewritePost(Mutable<ILogicalOperator> opRef, IOptimizationContext context)
+            throws AlgebricksException {
         AbstractLogicalOperator op0 = (AbstractLogicalOperator) opRef.getValue();
         if (op0.getOperatorTag() != LogicalOperatorTag.SUBPLAN) {
             return false;
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/InsertProjectBeforeUnionRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/InsertProjectBeforeUnionRule.java
index 337117e..d54833e 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/InsertProjectBeforeUnionRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/InsertProjectBeforeUnionRule.java
@@ -20,6 +20,8 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Triple;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
@@ -29,9 +31,7 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.UnionAllOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.visitors.VariableUtilities;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.physical.StreamProjectPOperator;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
-import edu.uci.ics.hyracks.algebricks.core.utils.Triple;
 
 public class InsertProjectBeforeUnionRule implements IAlgebraicRewriteRule {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/IntroHashPartitionMergeExchange.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/IntroHashPartitionMergeExchange.java
index 0e12bcc..f1321d3 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/IntroHashPartitionMergeExchange.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/IntroHashPartitionMergeExchange.java
@@ -5,6 +5,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.PhysicalOperatorTag;
@@ -13,7 +14,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.physical.HashPartitionMergeExchangePOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.physical.SortMergeExchangePOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.OrderColumn;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 
 public class IntroHashPartitionMergeExchange implements IAlgebraicRewriteRule {
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/IntroJoinInsideSubplanRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/IntroJoinInsideSubplanRule.java
index acff2de..d69cd14 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/IntroJoinInsideSubplanRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/IntroJoinInsideSubplanRule.java
@@ -21,6 +21,7 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
@@ -34,7 +35,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SubplanOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.util.OperatorManipulationUtil;
 import edu.uci.ics.hyracks.algebricks.core.algebra.util.OperatorPropertiesUtil;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 
 public class IntroJoinInsideSubplanRule extends AbstractDecorrelationRule {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/IntroduceCombinerRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/IntroduceCombinerRule.java
index c05572b..7f987e4 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/IntroduceCombinerRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/IntroduceCombinerRule.java
@@ -12,6 +12,8 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
@@ -32,9 +34,7 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.visitors.VariableUtilities;
 import edu.uci.ics.hyracks.algebricks.core.algebra.plan.ALogicalPlanImpl;
 import edu.uci.ics.hyracks.algebricks.core.algebra.util.OperatorPropertiesUtil;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
 
 public class IntroduceCombinerRule implements IAlgebraicRewriteRule {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/IntroduceGroupByForStandaloneAggregRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/IntroduceGroupByForStandaloneAggregRule.java
index 34060c2..5272347 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/IntroduceGroupByForStandaloneAggregRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/IntroduceGroupByForStandaloneAggregRule.java
@@ -21,6 +21,8 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
@@ -35,15 +37,11 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.NestedTupleSourceOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.visitors.VariableUtilities;
 import edu.uci.ics.hyracks.algebricks.core.algebra.plan.ALogicalPlanImpl;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
 
 /**
- * 
  * When aggregates appear w/o group-by, a default group by a constant is
  * introduced.
- * 
  */
 
 public class IntroduceGroupByForStandaloneAggregRule implements IAlgebraicRewriteRule {
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/IntroduceGroupByForSubplanRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/IntroduceGroupByForSubplanRule.java
index 71b9cda..18c483e 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/IntroduceGroupByForSubplanRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/IntroduceGroupByForSubplanRule.java
@@ -26,6 +26,8 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
@@ -53,10 +55,8 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.FunctionalDependency;
 import edu.uci.ics.hyracks.algebricks.core.algebra.util.OperatorManipulationUtil;
 import edu.uci.ics.hyracks.algebricks.core.algebra.util.OperatorPropertiesUtil;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.config.AlgebricksConfig;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.rewriter.util.PhysicalOptimizationsUtil;
 
 public class IntroduceGroupByForSubplanRule implements IAlgebraicRewriteRule {
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/IsolateHyracksOperatorsRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/IsolateHyracksOperatorsRule.java
index 194b818..ae57fb7 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/IsolateHyracksOperatorsRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/IsolateHyracksOperatorsRule.java
@@ -17,6 +17,7 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IPhysicalOperator;
@@ -27,7 +28,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ExchangeOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.physical.OneToOneExchangePOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.util.OperatorPropertiesUtil;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 
 public class IsolateHyracksOperatorsRule implements IAlgebraicRewriteRule {
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PullSelectOutOfEqJoin.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PullSelectOutOfEqJoin.java
index f60d2e9..75862cf 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PullSelectOutOfEqJoin.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PullSelectOutOfEqJoin.java
@@ -20,6 +20,7 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -33,7 +34,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractBinaryJoinOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SelectOperator;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 
 public class PullSelectOutOfEqJoin implements IAlgebraicRewriteRule {
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushAssignDownThroughProductRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushAssignDownThroughProductRule.java
index 5eb7160..c105b51 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushAssignDownThroughProductRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushAssignDownThroughProductRule.java
@@ -19,6 +19,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
@@ -27,7 +28,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractBinaryJoinOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.visitors.VariableUtilities;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 
 public class PushAssignDownThroughProductRule implements IAlgebraicRewriteRule {
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushDieUpRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushDieUpRule.java
index ef7822f..c4dd78d 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushDieUpRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushDieUpRule.java
@@ -3,11 +3,11 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 
 public class PushDieUpRule implements IAlgebraicRewriteRule {
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushLimitDownRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushLimitDownRule.java
index bd63619..acfdbd3 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushLimitDownRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushLimitDownRule.java
@@ -19,6 +19,7 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
@@ -32,7 +33,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.visitors.VariableUtilities;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.physical.StreamLimitPOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.util.OperatorPropertiesUtil;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 
 public class PushLimitDownRule implements IAlgebraicRewriteRule {
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushNestedOrderByUnderPreSortedGroupByRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushNestedOrderByUnderPreSortedGroupByRule.java
index b925cfe..95ad030 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushNestedOrderByUnderPreSortedGroupByRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushNestedOrderByUnderPreSortedGroupByRule.java
@@ -19,6 +19,8 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
@@ -34,9 +36,7 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.physical.AbstractPhysicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.physical.StableSortPOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.util.OperatorPropertiesUtil;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
 
 public class PushNestedOrderByUnderPreSortedGroupByRule implements IAlgebraicRewriteRule {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushProjectDownRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushProjectDownRule.java
index b70d88d..26d294b 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushProjectDownRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushProjectDownRule.java
@@ -23,6 +23,8 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
@@ -34,17 +36,13 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.GroupByOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ProjectOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.visitors.VariableUtilities;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
 
 /**
- * 
  * Pushes projections through its input operator, provided that operator does
  * not produce the projected variables.
  * 
  * @author Nicola
- * 
  */
 public class PushProjectDownRule implements IAlgebraicRewriteRule {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushProjectIntoDataSourceScanRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushProjectIntoDataSourceScanRule.java
index 4e14f9a..2cbbdbf 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushProjectIntoDataSourceScanRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushProjectIntoDataSourceScanRule.java
@@ -2,13 +2,13 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.DataSourceScanOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ProjectOperator;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 
 public class PushProjectIntoDataSourceScanRule implements IAlgebraicRewriteRule {
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushSelectDownRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushSelectDownRule.java
index fedcad9..ef4fd2e 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushSelectDownRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushSelectDownRule.java
@@ -19,6 +19,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
@@ -27,7 +28,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SelectOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.visitors.VariableUtilities;
 import edu.uci.ics.hyracks.algebricks.core.algebra.util.OperatorPropertiesUtil;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 
 public class PushSelectDownRule implements IAlgebraicRewriteRule {
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushSelectIntoJoinRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushSelectIntoJoinRule.java
index cdbab8c..8c679c5 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushSelectIntoJoinRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushSelectIntoJoinRule.java
@@ -25,6 +25,7 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -39,7 +40,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SelectOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.visitors.VariableUtilities;
 import edu.uci.ics.hyracks.algebricks.core.algebra.util.OperatorPropertiesUtil;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 
 public class PushSelectIntoJoinRule implements IAlgebraicRewriteRule {
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushSubplanWithAggregateDownThroughProductRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushSubplanWithAggregateDownThroughProductRule.java
index 25855e5..d7bd543 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushSubplanWithAggregateDownThroughProductRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/PushSubplanWithAggregateDownThroughProductRule.java
@@ -21,6 +21,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -31,7 +32,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SubplanOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.visitors.VariableUtilities;
 import edu.uci.ics.hyracks.algebricks.core.algebra.util.OperatorPropertiesUtil;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 
 public class PushSubplanWithAggregateDownThroughProductRule implements IAlgebraicRewriteRule {
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/ReinferAllTypesRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/ReinferAllTypesRule.java
index f06a2ac..e18a380 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/ReinferAllTypesRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/ReinferAllTypesRule.java
@@ -2,12 +2,12 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractOperatorWithNestedPlans;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 
 public class ReinferAllTypesRule implements IAlgebraicRewriteRule {
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/RemoveRedundantProjectionRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/RemoveRedundantProjectionRule.java
index cdc6086..f5ebe77 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/RemoveRedundantProjectionRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/RemoveRedundantProjectionRule.java
@@ -19,6 +19,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
@@ -26,7 +27,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ProjectOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.visitors.VariableUtilities;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 
 /*
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/RemoveUnusedAssignAndAggregateRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/RemoveUnusedAssignAndAggregateRule.java
index ff1a102..0fe7e98 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/RemoveUnusedAssignAndAggregateRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/RemoveUnusedAssignAndAggregateRule.java
@@ -22,6 +22,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
@@ -33,7 +34,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AggregateOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AssignOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.visitors.VariableUtilities;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 
 public class RemoveUnusedAssignAndAggregateRule implements IAlgebraicRewriteRule {
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/SetAlgebricksPhysicalOperatorsRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/SetAlgebricksPhysicalOperatorsRule.java
index f1f3533..7ef65f8 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/SetAlgebricksPhysicalOperatorsRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/SetAlgebricksPhysicalOperatorsRule.java
@@ -6,6 +6,9 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.NotImplementedException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
@@ -58,11 +61,8 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.physical.UnionAllPOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.physical.UnnestPOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.physical.WriteResultPOperator;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.NotImplementedException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.PhysicalOptimizationConfig;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
 import edu.uci.ics.hyracks.algebricks.rewriter.util.JoinUtils;
 
 public class SetAlgebricksPhysicalOperatorsRule implements IAlgebraicRewriteRule {
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/SetExecutionModeRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/SetExecutionModeRule.java
index bdd56b6..5bc3432 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/SetExecutionModeRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/SetExecutionModeRule.java
@@ -16,23 +16,20 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.NotImplementedException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.util.OperatorManipulationUtil;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.NotImplementedException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 
 /**
- * 
  * This rule sets the executionMode property of an operator, w/o introducing
  * EXCHANGE operators in the plan. Previously, i.e. before having physical
  * optimizations in place, we were using the IntroduceExchangeRule, which was
  * doing both, to both set excutionMode and introduce data exchange ops.
  * 
- * 
  * @author Nicola
- * 
  */
 public class SetExecutionModeRule implements IAlgebraicRewriteRule {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/SimpleUnnestToProductRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/SimpleUnnestToProductRule.java
index fb7a49f..9b98958 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/SimpleUnnestToProductRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/SimpleUnnestToProductRule.java
@@ -19,6 +19,7 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -28,7 +29,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractScanOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.EmptyTupleSourceOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.InnerJoinOperator;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 
 public class SimpleUnnestToProductRule implements IAlgebraicRewriteRule {
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/SubplanOutOfGroupRule.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/SubplanOutOfGroupRule.java
index 7c31fb9..09e03b5 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/SubplanOutOfGroupRule.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/rules/SubplanOutOfGroupRule.java
@@ -21,6 +21,7 @@
 import org.apache.commons.lang3.mutable.Mutable;
 import org.apache.commons.lang3.mutable.MutableObject;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -31,26 +32,16 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SubplanOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.visitors.VariableUtilities;
 import edu.uci.ics.hyracks.algebricks.core.algebra.util.OperatorPropertiesUtil;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
 
 /**
- * 
  * Looks for a nested group-by plan ending in
- * 
  * subplan {
- * 
  * ...
- * 
  * }
- * 
  * select (function-call: algebricks:not, Args:[function-call:
  * algebricks:is-null, Args:[...]])
- * 
  * nested tuple source -- |UNPARTITIONED|
- * 
- * 
- * 
  */
 
 public class SubplanOutOfGroupRule implements IAlgebraicRewriteRule {
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/util/JoinUtils.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/util/JoinUtils.java
index d9b7bad..ddc00e3 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/util/JoinUtils.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/util/JoinUtils.java
@@ -21,6 +21,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -41,7 +42,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.physical.InMemoryHashJoinPOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.physical.NLJoinPOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.ILogicalPropertiesVector;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.config.AlgebricksConfig;
 
 public class JoinUtils {
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/util/PhysicalOptimizationsUtil.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/util/PhysicalOptimizationsUtil.java
index 795c767..d7ebfb4 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/util/PhysicalOptimizationsUtil.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/util/PhysicalOptimizationsUtil.java
@@ -5,6 +5,7 @@
 
 import org.apache.commons.lang3.mutable.Mutable;
 
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
 import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
@@ -13,7 +14,6 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractOperatorWithNestedPlans;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.NestedTupleSourceOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.visitors.FDsAndEquivClassesVisitor;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.config.AlgebricksConfig;
 
 public class PhysicalOptimizationsUtil {
diff --git a/hyracks-algebricks/hyracks-algebricks-runtime/pom.xml b/hyracks-algebricks/hyracks-algebricks-runtime/pom.xml
new file mode 100644
index 0000000..79bcaeb
--- /dev/null
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/pom.xml
@@ -0,0 +1,51 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <artifactId>hyracks-algebricks-runtime</artifactId>
+
+  <parent>
+    <groupId>edu.uci.ics.hyracks</groupId>
+    <artifactId>hyracks-algebricks</artifactId>
+    <version>0.2.1-SNAPSHOT</version>
+  </parent>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>2.0.2</version>
+        <configuration>
+          <source>1.6</source>
+          <target>1.6</target>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+  <dependencies>
+  <dependency>
+  	<groupId>edu.uci.ics.hyracks</groupId>
+  	<artifactId>hyracks-storage-am-btree</artifactId>
+  	<version>0.2.1-SNAPSHOT</version>
+  </dependency>
+  <dependency>
+  	<groupId>edu.uci.ics.hyracks</groupId>
+  	<artifactId>hyracks-storage-am-rtree</artifactId>
+  	<version>0.2.1-SNAPSHOT</version>
+  </dependency>
+  <dependency>
+  	<groupId>edu.uci.ics.hyracks</groupId>
+  	<artifactId>hyracks-dataflow-std</artifactId>
+  	<version>0.2.1-SNAPSHOT</version>
+  </dependency>
+  <dependency>
+  	<groupId>edu.uci.ics.hyracks</groupId>
+  	<artifactId>hyracks-algebricks-common</artifactId>
+  	<version>0.2.1-SNAPSHOT</version>
+  </dependency>
+  <dependency>
+  	<groupId>edu.uci.ics.hyracks</groupId>
+  	<artifactId>hyracks-algebricks-data</artifactId>
+  	<version>0.2.1-SNAPSHOT</version>
+  </dependency>
+  </dependencies>
+</project>
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/aggregators/TupleCountAggregateFunctionFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/aggregators/TupleCountAggregateFunctionFactory.java
similarity index 81%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/aggregators/TupleCountAggregateFunctionFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/aggregators/TupleCountAggregateFunctionFactory.java
index acb2e0e..973fef6 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/aggregators/TupleCountAggregateFunctionFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/aggregators/TupleCountAggregateFunctionFactory.java
@@ -1,11 +1,11 @@
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.aggregators;
+package edu.uci.ics.hyracks.algebricks.runtime.aggregators;
 
 import java.io.DataOutput;
 import java.io.IOException;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IAggregateFunction;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IAggregateFunctionFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IAggregateFunction;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IAggregateFunctionFactory;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/aggregators/TupleCountRunningAggregateFunctionFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/aggregators/TupleCountRunningAggregateFunctionFactory.java
similarity index 83%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/aggregators/TupleCountRunningAggregateFunctionFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/aggregators/TupleCountRunningAggregateFunctionFactory.java
index 02fe250..736baaa 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/aggregators/TupleCountRunningAggregateFunctionFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/aggregators/TupleCountRunningAggregateFunctionFactory.java
@@ -12,14 +12,14 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.aggregators;
+package edu.uci.ics.hyracks.algebricks.runtime.aggregators;
 
 import java.io.DataOutput;
 import java.io.IOException;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IRunningAggregateFunction;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IRunningAggregateFunctionFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IRunningAggregateFunction;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IRunningAggregateFunctionFactory;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/AlgebricksPipeline.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/AlgebricksPipeline.java
similarity index 95%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/AlgebricksPipeline.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/AlgebricksPipeline.java
index ecd3e96..50f014b 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/AlgebricksPipeline.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/AlgebricksPipeline.java
@@ -12,7 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base;
+package edu.uci.ics.hyracks.algebricks.runtime.base;
 
 import java.io.Serializable;
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IAggregateFunction.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IAggregateFunction.java
similarity index 74%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IAggregateFunction.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IAggregateFunction.java
index e68ae52..8701c24 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IAggregateFunction.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IAggregateFunction.java
@@ -1,6 +1,6 @@
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base;
+package edu.uci.ics.hyracks.algebricks.runtime.base;
 
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
 
 public interface IAggregateFunction {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IAggregateFunctionFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IAggregateFunctionFactory.java
similarity index 86%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IAggregateFunctionFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IAggregateFunctionFactory.java
index e70c052..3c3bfeb 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IAggregateFunctionFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IAggregateFunctionFactory.java
@@ -12,11 +12,11 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base;
+package edu.uci.ics.hyracks.algebricks.runtime.base;
 
 import java.io.Serializable;
 
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
 
 public interface IAggregateFunctionFactory extends Serializable {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IEvaluator.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IEvaluator.java
similarity index 84%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IEvaluator.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IEvaluator.java
index 566651d..11767e3 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IEvaluator.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IEvaluator.java
@@ -12,9 +12,9 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base;
+package edu.uci.ics.hyracks.algebricks.runtime.base;
 
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
 
 public interface IEvaluator {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IEvaluatorFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IEvaluatorFactory.java
similarity index 85%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IEvaluatorFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IEvaluatorFactory.java
index 46db040..dde64c0 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IEvaluatorFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IEvaluatorFactory.java
@@ -12,11 +12,11 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base;
+package edu.uci.ics.hyracks.algebricks.runtime.base;
 
 import java.io.Serializable;
 
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
 
 public interface IEvaluatorFactory extends Serializable {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IPushRuntime.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IPushRuntime.java
similarity index 93%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IPushRuntime.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IPushRuntime.java
index 01ae150..26fcc67 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IPushRuntime.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IPushRuntime.java
@@ -12,7 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base;
+package edu.uci.ics.hyracks.algebricks.runtime.base;
 
 import edu.uci.ics.hyracks.api.comm.IFrameWriter;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IPushRuntimeFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IPushRuntimeFactory.java
similarity index 78%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IPushRuntimeFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IPushRuntimeFactory.java
index 4e2d113..3e349e1 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IPushRuntimeFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IPushRuntimeFactory.java
@@ -12,12 +12,12 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base;
+package edu.uci.ics.hyracks.algebricks.runtime.base;
 
 import java.io.Serializable;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.context.RuntimeContext;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.runtime.context.RuntimeContext;
 
 public interface IPushRuntimeFactory extends Serializable {
     public IPushRuntime createPushRuntime(RuntimeContext context) throws AlgebricksException;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IRunningAggregateFunction.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IRunningAggregateFunction.java
similarity index 85%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IRunningAggregateFunction.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IRunningAggregateFunction.java
index ac381cf..dc67f29 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IRunningAggregateFunction.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IRunningAggregateFunction.java
@@ -12,9 +12,9 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base;
+package edu.uci.ics.hyracks.algebricks.runtime.base;
 
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
 
 public interface IRunningAggregateFunction {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IRunningAggregateFunctionFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IRunningAggregateFunctionFactory.java
similarity index 86%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IRunningAggregateFunctionFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IRunningAggregateFunctionFactory.java
index 638f5f8..632b6f3 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IRunningAggregateFunctionFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IRunningAggregateFunctionFactory.java
@@ -12,11 +12,11 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base;
+package edu.uci.ics.hyracks.algebricks.runtime.base;
 
 import java.io.Serializable;
 
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
 
 public interface IRunningAggregateFunctionFactory extends Serializable {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/ISerializableAggregateFunction.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/ISerializableAggregateFunction.java
similarity index 88%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/ISerializableAggregateFunction.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/ISerializableAggregateFunction.java
index 4e9c5fb..3167bce 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/ISerializableAggregateFunction.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/ISerializableAggregateFunction.java
@@ -1,8 +1,8 @@
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base;
+package edu.uci.ics.hyracks.algebricks.runtime.base;
 
 import java.io.DataOutput;
 
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
 
 public interface ISerializableAggregateFunction {
diff --git a/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/ISerializableAggregateFunctionFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/ISerializableAggregateFunctionFactory.java
new file mode 100644
index 0000000..262aa5a
--- /dev/null
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/ISerializableAggregateFunctionFactory.java
@@ -0,0 +1,9 @@
+package edu.uci.ics.hyracks.algebricks.runtime.base;
+
+import java.io.Serializable;
+
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+
+public interface ISerializableAggregateFunctionFactory extends Serializable {
+    public ISerializableAggregateFunction createAggregateFunction() throws AlgebricksException;
+}
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IUnnestingFunction.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IUnnestingFunction.java
similarity index 85%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IUnnestingFunction.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IUnnestingFunction.java
index 5b891f2..d0e4e06 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IUnnestingFunction.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IUnnestingFunction.java
@@ -12,9 +12,9 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base;
+package edu.uci.ics.hyracks.algebricks.runtime.base;
 
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
 
 public interface IUnnestingFunction {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IUnnestingFunctionFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IUnnestingFunctionFactory.java
similarity index 86%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IUnnestingFunctionFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IUnnestingFunctionFactory.java
index 2134fd6..196708d 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/base/IUnnestingFunctionFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/base/IUnnestingFunctionFactory.java
@@ -12,11 +12,11 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base;
+package edu.uci.ics.hyracks.algebricks.runtime.base;
 
 import java.io.Serializable;
 
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
 
 public interface IUnnestingFunctionFactory extends Serializable {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/context/AsterixBTreeRegistry.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/context/AsterixBTreeRegistry.java
similarity index 94%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/context/AsterixBTreeRegistry.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/context/AsterixBTreeRegistry.java
index 4ea64d1..8ab92ee 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/context/AsterixBTreeRegistry.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/context/AsterixBTreeRegistry.java
@@ -12,7 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.context;
+package edu.uci.ics.hyracks.algebricks.runtime.context;
 
 import java.util.HashMap;
 import java.util.concurrent.locks.Lock;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/context/RuntimeContext.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/context/RuntimeContext.java
similarity index 93%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/context/RuntimeContext.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/context/RuntimeContext.java
index 5afd17f..8a1cf0a 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/context/RuntimeContext.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/context/RuntimeContext.java
@@ -12,7 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.context;
+package edu.uci.ics.hyracks.algebricks.runtime.context;
 
 import edu.uci.ics.hyracks.api.context.IHyracksTaskContext;
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/evaluators/ColumnAccessEvalFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/evaluators/ColumnAccessEvalFactory.java
similarity index 86%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/evaluators/ColumnAccessEvalFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/evaluators/ColumnAccessEvalFactory.java
index 4d8bf96..d019845 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/evaluators/ColumnAccessEvalFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/evaluators/ColumnAccessEvalFactory.java
@@ -12,14 +12,14 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.evaluators;
+package edu.uci.ics.hyracks.algebricks.runtime.evaluators;
 
 import java.io.DataOutput;
 import java.io.IOException;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluatorFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/evaluators/ConstantEvalFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/evaluators/ConstantEvalFactory.java
similarity index 84%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/evaluators/ConstantEvalFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/evaluators/ConstantEvalFactory.java
index f49f2ee..39f56b8 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/evaluators/ConstantEvalFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/evaluators/ConstantEvalFactory.java
@@ -12,14 +12,14 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.evaluators;
+package edu.uci.ics.hyracks.algebricks.runtime.evaluators;
 
 import java.io.DataOutput;
 import java.io.IOException;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluatorFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/aggreg/AggregateRuntimeFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/aggreg/AggregateRuntimeFactory.java
similarity index 87%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/aggreg/AggregateRuntimeFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/aggreg/AggregateRuntimeFactory.java
index 5184e12..f6a4f9d 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/aggreg/AggregateRuntimeFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/aggreg/AggregateRuntimeFactory.java
@@ -12,16 +12,16 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.aggreg;
+package edu.uci.ics.hyracks.algebricks.runtime.operators.aggreg;
 
 import java.nio.ByteBuffer;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IAggregateFunction;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IAggregateFunctionFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.context.RuntimeContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base.AbstractOneInputOneOutputOneFramePushRuntime;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base.AbstractOneInputOneOutputRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IAggregateFunction;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IAggregateFunctionFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.context.RuntimeContext;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputOneOutputOneFramePushRuntime;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputOneOutputRuntimeFactory;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.dataflow.common.comm.io.ArrayTupleBuilder;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/aggreg/NestedPlansAccumulatingAggregatorFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/aggreg/NestedPlansAccumulatingAggregatorFactory.java
similarity index 92%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/aggreg/NestedPlansAccumulatingAggregatorFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/aggreg/NestedPlansAccumulatingAggregatorFactory.java
index b7b64ab..dfd9ec7 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/aggreg/NestedPlansAccumulatingAggregatorFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/aggreg/NestedPlansAccumulatingAggregatorFactory.java
@@ -12,16 +12,16 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.aggreg;
+package edu.uci.ics.hyracks.algebricks.runtime.operators.aggreg;
 
 import java.nio.ByteBuffer;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.AlgebricksPipeline;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IPushRuntime;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IPushRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.context.RuntimeContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std.NestedTupleSourceRuntimeFactory.NestedTupleSourceRuntime;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.runtime.base.AlgebricksPipeline;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IPushRuntime;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IPushRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.context.RuntimeContext;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.std.NestedTupleSourceRuntimeFactory.NestedTupleSourceRuntime;
 import edu.uci.ics.hyracks.api.comm.IFrameTupleAccessor;
 import edu.uci.ics.hyracks.api.comm.IFrameWriter;
 import edu.uci.ics.hyracks.api.context.IHyracksTaskContext;
@@ -164,10 +164,7 @@
     }
 
     /**
-     * 
-     * 
      * We suppose for now, that each subplan only produces one tuple.
-     * 
      */
     private static class AggregatorOutput implements IFrameWriter {
 
@@ -202,10 +199,8 @@
         }
 
         /**
-         * 
          * Since each pipeline only produces one tuple, this method is only
          * called by the close method of the pipelines.
-         * 
          */
         @Override
         public void nextFrame(ByteBuffer buffer) throws HyracksDataException {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/aggreg/SerializableAggregatorDescriptorFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/aggreg/SerializableAggregatorDescriptorFactory.java
similarity index 93%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/aggreg/SerializableAggregatorDescriptorFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/aggreg/SerializableAggregatorDescriptorFactory.java
index 3cdf2f5..ec9a63c 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/aggreg/SerializableAggregatorDescriptorFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/aggreg/SerializableAggregatorDescriptorFactory.java
@@ -1,10 +1,10 @@
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.aggreg;
+package edu.uci.ics.hyracks.algebricks.runtime.operators.aggreg;
 
 import java.io.DataOutput;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.ISerializableAggregateFunction;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.ISerializableAggregateFunctionFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ISerializableAggregateFunction;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ISerializableAggregateFunctionFactory;
 import edu.uci.ics.hyracks.api.comm.IFrameTupleAccessor;
 import edu.uci.ics.hyracks.api.context.IHyracksTaskContext;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
@@ -81,7 +81,7 @@
                     int stateTupleIndex, AggregateState state) throws HyracksDataException {
                 ftr.reset(accessor, tIndex);
                 int stateTupleStart = stateAccessor.getTupleStartOffset(stateTupleIndex);
-		int fieldSlotLength = stateAccessor.getFieldSlotsLength();
+                int fieldSlotLength = stateAccessor.getFieldSlotsLength();
                 for (int i = 0; i < aggs.length; i++) {
                     try {
                         byte[] data = stateAccessor.getBuffer().array();
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/aggreg/SimpleAlgebricksAccumulatingAggregatorFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/aggreg/SimpleAlgebricksAccumulatingAggregatorFactory.java
similarity index 93%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/aggreg/SimpleAlgebricksAccumulatingAggregatorFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/aggreg/SimpleAlgebricksAccumulatingAggregatorFactory.java
index 1743dfc..99feae1 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/aggreg/SimpleAlgebricksAccumulatingAggregatorFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/aggreg/SimpleAlgebricksAccumulatingAggregatorFactory.java
@@ -12,12 +12,12 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.aggreg;
+package edu.uci.ics.hyracks.algebricks.runtime.operators.aggreg;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IAggregateFunction;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IAggregateFunctionFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IAggregateFunction;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IAggregateFunctionFactory;
 import edu.uci.ics.hyracks.api.comm.IFrameTupleAccessor;
 import edu.uci.ics.hyracks.api.context.IHyracksTaskContext;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/base/AbstractOneInputOneOutputOneFramePushRuntime.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/base/AbstractOneInputOneOutputOneFramePushRuntime.java
similarity index 95%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/base/AbstractOneInputOneOutputOneFramePushRuntime.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/base/AbstractOneInputOneOutputOneFramePushRuntime.java
index 5d5e7fb..0ff1b89 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/base/AbstractOneInputOneOutputOneFramePushRuntime.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/base/AbstractOneInputOneOutputOneFramePushRuntime.java
@@ -12,11 +12,11 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base;
+package edu.uci.ics.hyracks.algebricks.runtime.operators.base;
 
 import java.nio.ByteBuffer;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.context.RuntimeContext;
+import edu.uci.ics.hyracks.algebricks.runtime.context.RuntimeContext;
 import edu.uci.ics.hyracks.api.context.IHyracksTaskContext;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.dataflow.common.comm.io.ArrayTupleBuilder;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/base/AbstractOneInputOneOutputPushRuntime.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/base/AbstractOneInputOneOutputPushRuntime.java
similarity index 92%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/base/AbstractOneInputOneOutputPushRuntime.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/base/AbstractOneInputOneOutputPushRuntime.java
index 1034232..22f7df6 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/base/AbstractOneInputOneOutputPushRuntime.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/base/AbstractOneInputOneOutputPushRuntime.java
@@ -12,7 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base;
+package edu.uci.ics.hyracks.algebricks.runtime.operators.base;
 
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/base/AbstractOneInputOneOutputRuntimeFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/base/AbstractOneInputOneOutputRuntimeFactory.java
similarity index 75%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/base/AbstractOneInputOneOutputRuntimeFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/base/AbstractOneInputOneOutputRuntimeFactory.java
index 23f4f6f..81db95e 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/base/AbstractOneInputOneOutputRuntimeFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/base/AbstractOneInputOneOutputRuntimeFactory.java
@@ -12,12 +12,12 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base;
+package edu.uci.ics.hyracks.algebricks.runtime.operators.base;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IPushRuntime;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IPushRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.context.RuntimeContext;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IPushRuntime;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IPushRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.context.RuntimeContext;
 
 public abstract class AbstractOneInputOneOutputRuntimeFactory implements IPushRuntimeFactory {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/base/AbstractOneInputPushRuntime.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/base/AbstractOneInputPushRuntime.java
similarity index 88%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/base/AbstractOneInputPushRuntime.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/base/AbstractOneInputPushRuntime.java
index 5660b2c..b214f83 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/base/AbstractOneInputPushRuntime.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/base/AbstractOneInputPushRuntime.java
@@ -12,9 +12,9 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base;
+package edu.uci.ics.hyracks.algebricks.runtime.operators.base;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IPushRuntime;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IPushRuntime;
 import edu.uci.ics.hyracks.api.comm.IFrameWriter;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/base/AbstractOneInputSinkPushRuntime.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/base/AbstractOneInputSinkPushRuntime.java
similarity index 88%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/base/AbstractOneInputSinkPushRuntime.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/base/AbstractOneInputSinkPushRuntime.java
index 82cf050..0fbe51f 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/base/AbstractOneInputSinkPushRuntime.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/base/AbstractOneInputSinkPushRuntime.java
@@ -12,9 +12,9 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base;
+package edu.uci.ics.hyracks.algebricks.runtime.operators.base;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IPushRuntime;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IPushRuntime;
 import edu.uci.ics.hyracks.api.comm.IFrameWriter;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/base/AbstractOneInputSourcePushRuntime.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/base/AbstractOneInputSourcePushRuntime.java
similarity index 94%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/base/AbstractOneInputSourcePushRuntime.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/base/AbstractOneInputSourcePushRuntime.java
index 3f1c0f3..1d23d14 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/base/AbstractOneInputSourcePushRuntime.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/base/AbstractOneInputSourcePushRuntime.java
@@ -12,7 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base;
+package edu.uci.ics.hyracks.algebricks.runtime.operators.base;
 
 import java.nio.ByteBuffer;
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/base/SinkRuntimeFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/base/SinkRuntimeFactory.java
similarity index 79%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/base/SinkRuntimeFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/base/SinkRuntimeFactory.java
index 791d9a1..81e91f6 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/base/SinkRuntimeFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/base/SinkRuntimeFactory.java
@@ -12,14 +12,14 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base;
+package edu.uci.ics.hyracks.algebricks.runtime.operators.base;
 
 import java.nio.ByteBuffer;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IPushRuntime;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IPushRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.context.RuntimeContext;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IPushRuntime;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IPushRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.context.RuntimeContext;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 
 public class SinkRuntimeFactory implements IPushRuntimeFactory {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/group/MicroPreClusteredGroupRuntimeFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/group/MicroPreClusteredGroupRuntimeFactory.java
similarity index 86%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/group/MicroPreClusteredGroupRuntimeFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/group/MicroPreClusteredGroupRuntimeFactory.java
index b15d63d..ea83fdd 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/group/MicroPreClusteredGroupRuntimeFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/group/MicroPreClusteredGroupRuntimeFactory.java
@@ -1,12 +1,12 @@
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.group;
+package edu.uci.ics.hyracks.algebricks.runtime.operators.group;
 
 import java.nio.ByteBuffer;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.context.RuntimeContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base.AbstractOneInputOneOutputPushRuntime;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base.AbstractOneInputOneOutputRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.NotImplementedException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.NotImplementedException;
+import edu.uci.ics.hyracks.algebricks.runtime.context.RuntimeContext;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputOneOutputPushRuntime;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputOneOutputRuntimeFactory;
 import edu.uci.ics.hyracks.api.context.IHyracksTaskContext;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparator;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
@@ -16,7 +16,7 @@
 import edu.uci.ics.hyracks.dataflow.common.comm.io.FrameTupleAppender;
 import edu.uci.ics.hyracks.dataflow.std.group.IAggregatorDescriptor;
 import edu.uci.ics.hyracks.dataflow.std.group.IAggregatorDescriptorFactory;
-import edu.uci.ics.hyracks.dataflow.std.group.PreclusteredGroupWriter;
+import edu.uci.ics.hyracks.dataflow.std.group.preclustered.PreclusteredGroupWriter;
 
 public class MicroPreClusteredGroupRuntimeFactory extends AbstractOneInputOneOutputRuntimeFactory {
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/meta/AlgebricksMetaOperatorDescriptor.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/meta/AlgebricksMetaOperatorDescriptor.java
similarity index 91%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/meta/AlgebricksMetaOperatorDescriptor.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/meta/AlgebricksMetaOperatorDescriptor.java
index 2fdeb23..91fa8a1 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/meta/AlgebricksMetaOperatorDescriptor.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/meta/AlgebricksMetaOperatorDescriptor.java
@@ -12,24 +12,24 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.meta;
+package edu.uci.ics.hyracks.algebricks.runtime.operators.meta;
 
 import java.nio.ByteBuffer;
 
 import org.json.JSONException;
 import org.json.JSONObject;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.AlgebricksPipeline;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IPushRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.context.RuntimeContext;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.runtime.base.AlgebricksPipeline;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IPushRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.context.RuntimeContext;
 import edu.uci.ics.hyracks.api.comm.IFrameWriter;
 import edu.uci.ics.hyracks.api.context.IHyracksTaskContext;
 import edu.uci.ics.hyracks.api.dataflow.IOperatorNodePushable;
 import edu.uci.ics.hyracks.api.dataflow.value.IRecordDescriptorProvider;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
-import edu.uci.ics.hyracks.api.job.JobSpecification;
+import edu.uci.ics.hyracks.api.job.IOperatorDescriptorRegistry;
 import edu.uci.ics.hyracks.dataflow.std.base.AbstractSingleActivityOperatorDescriptor;
 import edu.uci.ics.hyracks.dataflow.std.base.AbstractUnaryInputUnaryOutputOperatorNodePushable;
 import edu.uci.ics.hyracks.dataflow.std.base.AbstractUnaryOutputSourceOperatorNodePushable;
@@ -41,7 +41,7 @@
     // array of factories for building the local runtime pipeline
     private final AlgebricksPipeline pipeline;
 
-    public AlgebricksMetaOperatorDescriptor(JobSpecification spec, int inputArity, int outputArity,
+    public AlgebricksMetaOperatorDescriptor(IOperatorDescriptorRegistry spec, int inputArity, int outputArity,
             IPushRuntimeFactory[] runtimeFactories, RecordDescriptor[] internalRecordDescriptors) {
         super(spec, inputArity, outputArity);
         if (outputArity == 1) {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/meta/PipelineAssembler.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/meta/PipelineAssembler.java
similarity index 86%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/meta/PipelineAssembler.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/meta/PipelineAssembler.java
index f0f5029..1041438 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/meta/PipelineAssembler.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/meta/PipelineAssembler.java
@@ -12,12 +12,12 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.meta;
+package edu.uci.ics.hyracks.algebricks.runtime.operators.meta;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.AlgebricksPipeline;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IPushRuntime;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.context.RuntimeContext;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.runtime.base.AlgebricksPipeline;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IPushRuntime;
+import edu.uci.ics.hyracks.algebricks.runtime.context.RuntimeContext;
 import edu.uci.ics.hyracks.api.comm.IFrameWriter;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/meta/SubplanRuntimeFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/meta/SubplanRuntimeFactory.java
similarity index 87%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/meta/SubplanRuntimeFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/meta/SubplanRuntimeFactory.java
index 53808e1..c7adf1f 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/meta/SubplanRuntimeFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/meta/SubplanRuntimeFactory.java
@@ -12,20 +12,20 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.meta;
+package edu.uci.ics.hyracks.algebricks.runtime.operators.meta;
 
 import java.io.DataOutput;
 import java.nio.ByteBuffer;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.AlgebricksPipeline;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IPushRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.context.RuntimeContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base.AbstractOneInputOneOutputOneFramePushRuntime;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base.AbstractOneInputOneOutputPushRuntime;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base.AbstractOneInputOneOutputRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std.NestedTupleSourceRuntimeFactory.NestedTupleSourceRuntime;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.NotImplementedException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.NotImplementedException;
+import edu.uci.ics.hyracks.algebricks.runtime.base.AlgebricksPipeline;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IPushRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.context.RuntimeContext;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputOneOutputOneFramePushRuntime;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputOneOutputPushRuntime;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputOneOutputRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.std.NestedTupleSourceRuntimeFactory.NestedTupleSourceRuntime;
 import edu.uci.ics.hyracks.api.comm.IFrameWriter;
 import edu.uci.ics.hyracks.api.context.IHyracksTaskContext;
 import edu.uci.ics.hyracks.api.dataflow.value.INullWriter;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/sort/InMemorySortRuntimeFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/sort/InMemorySortRuntimeFactory.java
similarity index 84%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/sort/InMemorySortRuntimeFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/sort/InMemorySortRuntimeFactory.java
index 2a6c196..3fa3a50 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/sort/InMemorySortRuntimeFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/sort/InMemorySortRuntimeFactory.java
@@ -12,15 +12,15 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.sort;
+package edu.uci.ics.hyracks.algebricks.runtime.operators.sort;
 
 import java.nio.ByteBuffer;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.context.RuntimeContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base.AbstractOneInputOneOutputPushRuntime;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base.AbstractOneInputOneOutputRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.NotImplementedException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.NotImplementedException;
+import edu.uci.ics.hyracks.algebricks.runtime.context.RuntimeContext;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputOneOutputPushRuntime;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputOneOutputRuntimeFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.INormalizedKeyComputerFactory;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/AssignRuntimeFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/AssignRuntimeFactory.java
similarity index 88%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/AssignRuntimeFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/AssignRuntimeFactory.java
index 04dc7d6..8a89b17 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/AssignRuntimeFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/AssignRuntimeFactory.java
@@ -12,17 +12,17 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std;
+package edu.uci.ics.hyracks.algebricks.runtime.operators.std;
 
 import java.nio.ByteBuffer;
 import java.util.Arrays;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluatorFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.context.RuntimeContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base.AbstractOneInputOneOutputOneFramePushRuntime;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base.AbstractOneInputOneOutputRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.context.RuntimeContext;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputOneOutputOneFramePushRuntime;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputOneOutputRuntimeFactory;
 import edu.uci.ics.hyracks.api.comm.IFrameTupleAccessor;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.dataflow.common.comm.io.ArrayTupleBuilder;
@@ -37,7 +37,6 @@
     private IEvaluatorFactory[] evalFactories;
 
     /**
-     * 
      * @param outColumns
      *            a sorted array of columns into which the result is written to
      * @param evalFactories
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/EmptyTupleSourceRuntimeFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/EmptyTupleSourceRuntimeFactory.java
similarity index 83%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/EmptyTupleSourceRuntimeFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/EmptyTupleSourceRuntimeFactory.java
index 2d0a038..659ba74 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/EmptyTupleSourceRuntimeFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/EmptyTupleSourceRuntimeFactory.java
@@ -12,14 +12,14 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std;
+package edu.uci.ics.hyracks.algebricks.runtime.operators.std;
 
 import java.nio.ByteBuffer;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IPushRuntime;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IPushRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.context.RuntimeContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base.AbstractOneInputSourcePushRuntime;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IPushRuntime;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IPushRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.context.RuntimeContext;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputSourcePushRuntime;
 import edu.uci.ics.hyracks.api.context.IHyracksTaskContext;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.dataflow.common.comm.io.ArrayTupleBuilder;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/NestedTupleSourceRuntimeFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/NestedTupleSourceRuntimeFactory.java
similarity index 81%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/NestedTupleSourceRuntimeFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/NestedTupleSourceRuntimeFactory.java
index 8c650b5..899147d 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/NestedTupleSourceRuntimeFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/NestedTupleSourceRuntimeFactory.java
@@ -12,14 +12,14 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std;
+package edu.uci.ics.hyracks.algebricks.runtime.operators.std;
 
 import java.nio.ByteBuffer;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IPushRuntime;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IPushRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.context.RuntimeContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base.AbstractOneInputOneOutputOneFramePushRuntime;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IPushRuntime;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IPushRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.context.RuntimeContext;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputOneOutputOneFramePushRuntime;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 
 public class NestedTupleSourceRuntimeFactory implements IPushRuntimeFactory {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/PrinterRuntimeFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/PrinterRuntimeFactory.java
similarity index 77%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/PrinterRuntimeFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/PrinterRuntimeFactory.java
index 787e001..d4040f2 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/PrinterRuntimeFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/PrinterRuntimeFactory.java
@@ -12,14 +12,14 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std;
+package edu.uci.ics.hyracks.algebricks.runtime.operators.std;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IAWriter;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IPrinterFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IPushRuntime;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IPushRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.context.RuntimeContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.writers.PrinterBasedWriterFactory;
+import edu.uci.ics.hyracks.algebricks.data.IAWriter;
+import edu.uci.ics.hyracks.algebricks.data.IPrinterFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IPushRuntime;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IPushRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.context.RuntimeContext;
+import edu.uci.ics.hyracks.algebricks.runtime.writers.PrinterBasedWriterFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 
 public class PrinterRuntimeFactory implements IPushRuntimeFactory {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/RunningAggregateRuntimeFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/RunningAggregateRuntimeFactory.java
similarity index 88%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/RunningAggregateRuntimeFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/RunningAggregateRuntimeFactory.java
index bca8f2f..83976c9 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/RunningAggregateRuntimeFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/RunningAggregateRuntimeFactory.java
@@ -12,17 +12,17 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std;
+package edu.uci.ics.hyracks.algebricks.runtime.operators.std;
 
 import java.nio.ByteBuffer;
 import java.util.Arrays;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IRunningAggregateFunction;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IRunningAggregateFunctionFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.context.RuntimeContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base.AbstractOneInputOneOutputOneFramePushRuntime;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base.AbstractOneInputOneOutputRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IRunningAggregateFunction;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IRunningAggregateFunctionFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.context.RuntimeContext;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputOneOutputOneFramePushRuntime;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputOneOutputRuntimeFactory;
 import edu.uci.ics.hyracks.api.comm.IFrameTupleAccessor;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.dataflow.common.comm.io.ArrayTupleBuilder;
@@ -37,7 +37,6 @@
     private IRunningAggregateFunctionFactory[] runningAggregates;
 
     /**
-     * 
      * @param outColumns
      *            a sorted array of columns into which the result is written to
      * @param runningAggregates
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/SinkWriterRuntime.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/SinkWriterRuntime.java
similarity index 88%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/SinkWriterRuntime.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/SinkWriterRuntime.java
index 8101a8a..56a3f0e 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/SinkWriterRuntime.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/SinkWriterRuntime.java
@@ -12,15 +12,15 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std;
+package edu.uci.ics.hyracks.algebricks.runtime.operators.std;
 
 import java.io.PrintStream;
 import java.nio.ByteBuffer;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IAWriter;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.context.RuntimeContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base.AbstractOneInputSinkPushRuntime;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.data.IAWriter;
+import edu.uci.ics.hyracks.algebricks.runtime.context.RuntimeContext;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputSinkPushRuntime;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.dataflow.common.comm.io.FrameTupleAccessor;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/SinkWriterRuntimeFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/SinkWriterRuntimeFactory.java
similarity index 80%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/SinkWriterRuntimeFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/SinkWriterRuntimeFactory.java
index 4ac1d16..0641b0c 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/SinkWriterRuntimeFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/SinkWriterRuntimeFactory.java
@@ -12,7 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std;
+package edu.uci.ics.hyracks.algebricks.runtime.operators.std;
 
 import java.io.BufferedOutputStream;
 import java.io.File;
@@ -20,13 +20,13 @@
 import java.io.FileOutputStream;
 import java.io.PrintStream;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IAWriter;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IAWriterFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IPrinterFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IPushRuntime;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IPushRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.context.RuntimeContext;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.data.IAWriter;
+import edu.uci.ics.hyracks.algebricks.data.IAWriterFactory;
+import edu.uci.ics.hyracks.algebricks.data.IPrinterFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IPushRuntime;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IPushRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.context.RuntimeContext;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 
 public class SinkWriterRuntimeFactory implements IPushRuntimeFactory {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/StreamDieRuntimeFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/StreamDieRuntimeFactory.java
similarity index 82%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/StreamDieRuntimeFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/StreamDieRuntimeFactory.java
index 86b9b3b..8a12840 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/StreamDieRuntimeFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/StreamDieRuntimeFactory.java
@@ -1,14 +1,14 @@
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std;
+package edu.uci.ics.hyracks.algebricks.runtime.operators.std;
 
 import java.nio.ByteBuffer;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IBinaryIntegerInspector;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluatorFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.context.RuntimeContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base.AbstractOneInputOneOutputOneFramePushRuntime;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base.AbstractOneInputOneOutputRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.data.IBinaryIntegerInspector;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.context.RuntimeContext;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputOneOutputOneFramePushRuntime;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputOneOutputRuntimeFactory;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/StreamLimitRuntimeFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/StreamLimitRuntimeFactory.java
similarity index 86%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/StreamLimitRuntimeFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/StreamLimitRuntimeFactory.java
index 5caea6e..5a23b98 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/StreamLimitRuntimeFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/StreamLimitRuntimeFactory.java
@@ -1,14 +1,14 @@
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std;
+package edu.uci.ics.hyracks.algebricks.runtime.operators.std;
 
 import java.nio.ByteBuffer;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IBinaryIntegerInspector;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluatorFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.context.RuntimeContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base.AbstractOneInputOneOutputOneFramePushRuntime;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base.AbstractOneInputOneOutputRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.data.IBinaryIntegerInspector;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.context.RuntimeContext;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputOneOutputOneFramePushRuntime;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputOneOutputRuntimeFactory;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/StreamProjectRuntimeFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/StreamProjectRuntimeFactory.java
similarity index 80%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/StreamProjectRuntimeFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/StreamProjectRuntimeFactory.java
index fe30701..e452059 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/StreamProjectRuntimeFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/StreamProjectRuntimeFactory.java
@@ -12,15 +12,15 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std;
+package edu.uci.ics.hyracks.algebricks.runtime.operators.std;
 
 import java.nio.ByteBuffer;
 import java.util.Arrays;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.context.RuntimeContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base.AbstractOneInputOneOutputOneFramePushRuntime;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base.AbstractOneInputOneOutputRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.runtime.context.RuntimeContext;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputOneOutputOneFramePushRuntime;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputOneOutputRuntimeFactory;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 
 public class StreamProjectRuntimeFactory extends AbstractOneInputOneOutputRuntimeFactory {
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/StreamSelectRuntimeFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/StreamSelectRuntimeFactory.java
similarity index 82%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/StreamSelectRuntimeFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/StreamSelectRuntimeFactory.java
index be579e5..1e4f4cc 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/StreamSelectRuntimeFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/StreamSelectRuntimeFactory.java
@@ -12,17 +12,17 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std;
+package edu.uci.ics.hyracks.algebricks.runtime.operators.std;
 
 import java.nio.ByteBuffer;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IBinaryBooleanInspector;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluatorFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.context.RuntimeContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base.AbstractOneInputOneOutputOneFramePushRuntime;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base.AbstractOneInputOneOutputRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.data.IBinaryBooleanInspector;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.context.RuntimeContext;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputOneOutputOneFramePushRuntime;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputOneOutputRuntimeFactory;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 
@@ -35,7 +35,6 @@
     private IBinaryBooleanInspector binaryBooleanInspector;
 
     /**
-     * 
      * @param cond
      * @param projectionList
      *            if projectionList is null, then no projection is performed
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/StringStreamingRuntimeFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/StringStreamingRuntimeFactory.java
similarity index 91%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/StringStreamingRuntimeFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/StringStreamingRuntimeFactory.java
index f3d07b1..cfc21ad 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/StringStreamingRuntimeFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/StringStreamingRuntimeFactory.java
@@ -12,7 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std;
+package edu.uci.ics.hyracks.algebricks.runtime.operators.std;
 
 import java.io.BufferedReader;
 import java.io.IOException;
@@ -21,12 +21,12 @@
 import java.io.PrintStream;
 import java.nio.ByteBuffer;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IPrinter;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IPrinterFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.context.RuntimeContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base.AbstractOneInputOneOutputOneFramePushRuntime;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base.AbstractOneInputOneOutputRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.data.IPrinter;
+import edu.uci.ics.hyracks.algebricks.data.IPrinterFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.context.RuntimeContext;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputOneOutputOneFramePushRuntime;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputOneOutputRuntimeFactory;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.dataflow.std.file.ITupleParser;
 import edu.uci.ics.hyracks.dataflow.std.file.ITupleParserFactory;
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/UnnestRuntimeFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/UnnestRuntimeFactory.java
similarity index 85%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/UnnestRuntimeFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/UnnestRuntimeFactory.java
index bc55b6a..e32b023 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/operators/std/UnnestRuntimeFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/operators/std/UnnestRuntimeFactory.java
@@ -12,16 +12,16 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std;
+package edu.uci.ics.hyracks.algebricks.runtime.operators.std;
 
 import java.nio.ByteBuffer;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IUnnestingFunction;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IUnnestingFunctionFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.context.RuntimeContext;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base.AbstractOneInputOneOutputOneFramePushRuntime;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.base.AbstractOneInputOneOutputRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IUnnestingFunction;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IUnnestingFunctionFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.context.RuntimeContext;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputOneOutputOneFramePushRuntime;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputOneOutputRuntimeFactory;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.dataflow.common.comm.io.ArrayTupleBuilder;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
@@ -102,8 +102,8 @@
                                     for (int f = 0; f < outColPos; f++) {
                                         tupleBuilder.addField(tAccess, t, f);
                                     }
-                                    tupleBuilder.addField(evalOutput.getBytes(), evalOutput.getStartIndex(), evalOutput
-                                            .getLength());
+                                    tupleBuilder.addField(evalOutput.getBytes(), evalOutput.getStartIndex(),
+                                            evalOutput.getLength());
                                     for (int f = outColPos + 1; f < projectionList.length; f++) {
                                         tupleBuilder.addField(tAccess, t, f);
                                     }
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/writers/PrinterBasedWriterFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/writers/PrinterBasedWriterFactory.java
similarity index 73%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/writers/PrinterBasedWriterFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/writers/PrinterBasedWriterFactory.java
index 36ef827..9c53241 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/writers/PrinterBasedWriterFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/writers/PrinterBasedWriterFactory.java
@@ -1,14 +1,14 @@
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.writers;
+package edu.uci.ics.hyracks.algebricks.runtime.writers;
 
 import java.io.PrintStream;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IAWriter;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IAWriterFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IPrinter;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IPrinterFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.data.IAWriter;
+import edu.uci.ics.hyracks.algebricks.data.IAWriterFactory;
+import edu.uci.ics.hyracks.algebricks.data.IPrinter;
+import edu.uci.ics.hyracks.algebricks.data.IPrinterFactory;
+import edu.uci.ics.hyracks.api.comm.IFrameTupleAccessor;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
-import edu.uci.ics.hyracks.dataflow.common.comm.io.FrameTupleAccessor;
 
 public class PrinterBasedWriterFactory implements IAWriterFactory {
 
@@ -37,7 +37,7 @@
             }
 
             @Override
-            public void printTuple(FrameTupleAccessor tAccess, int tIdx) throws AlgebricksException {
+            public void printTuple(IFrameTupleAccessor tAccess, int tIdx) throws AlgebricksException {
                 for (int i = 0; i < fields.length; i++) {
                     int fldStart = tAccess.getTupleStartOffset(tIdx) + tAccess.getFieldSlotsLength()
                             + tAccess.getFieldStartOffset(tIdx, fields[i]);
diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/writers/SerializedDataWriterFactory.java b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/writers/SerializedDataWriterFactory.java
similarity index 74%
rename from hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/writers/SerializedDataWriterFactory.java
rename to hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/writers/SerializedDataWriterFactory.java
index 79d7a99..61f822e 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/algebra/runtime/writers/SerializedDataWriterFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-runtime/src/main/java/edu/uci/ics/hyracks/algebricks/runtime/writers/SerializedDataWriterFactory.java
@@ -1,16 +1,16 @@
-package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.writers;
+package edu.uci.ics.hyracks.algebricks.runtime.writers;
 
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.ObjectOutputStream;
 import java.io.PrintStream;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IAWriter;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IAWriterFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IPrinterFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.data.IAWriter;
+import edu.uci.ics.hyracks.algebricks.data.IAWriterFactory;
+import edu.uci.ics.hyracks.algebricks.data.IPrinterFactory;
+import edu.uci.ics.hyracks.api.comm.IFrameTupleAccessor;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
-import edu.uci.ics.hyracks.dataflow.common.comm.io.FrameTupleAccessor;
 
 public class SerializedDataWriterFactory implements IAWriterFactory {
 
@@ -36,7 +36,7 @@
             }
 
             @Override
-            public void printTuple(FrameTupleAccessor tAccess, int tIdx) throws AlgebricksException {
+            public void printTuple(IFrameTupleAccessor tAccess, int tIdx) throws AlgebricksException {
                 for (int i = 0; i < fields.length; i++) {
                     int fldStart = tAccess.getTupleStartOffset(tIdx) + tAccess.getFieldSlotsLength()
                             + tAccess.getFieldStartOffset(tIdx, fields[i]);
diff --git a/hyracks-algebricks/hyracks-algebricks-tests/src/main/java/edu/uci/ics/hyracks/algebricks/tests/pushruntime/IntArrayUnnester.java b/hyracks-algebricks/hyracks-algebricks-tests/src/main/java/edu/uci/ics/hyracks/algebricks/tests/pushruntime/IntArrayUnnester.java
index ed98eec..12437c0 100644
--- a/hyracks-algebricks/hyracks-algebricks-tests/src/main/java/edu/uci/ics/hyracks/algebricks/tests/pushruntime/IntArrayUnnester.java
+++ b/hyracks-algebricks/hyracks-algebricks-tests/src/main/java/edu/uci/ics/hyracks/algebricks/tests/pushruntime/IntArrayUnnester.java
@@ -17,9 +17,9 @@
 import java.io.DataOutput;
 import java.io.IOException;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IUnnestingFunction;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IUnnestingFunctionFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IUnnestingFunction;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IUnnestingFunctionFactory;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
 
diff --git a/hyracks-algebricks/hyracks-algebricks-tests/src/main/java/edu/uci/ics/hyracks/algebricks/tests/pushruntime/IntegerAddEvalFactory.java b/hyracks-algebricks/hyracks-algebricks-tests/src/main/java/edu/uci/ics/hyracks/algebricks/tests/pushruntime/IntegerAddEvalFactory.java
index 57c0789..42a08bb 100644
--- a/hyracks-algebricks/hyracks-algebricks-tests/src/main/java/edu/uci/ics/hyracks/algebricks/tests/pushruntime/IntegerAddEvalFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-tests/src/main/java/edu/uci/ics/hyracks/algebricks/tests/pushruntime/IntegerAddEvalFactory.java
@@ -17,9 +17,9 @@
 import java.io.DataOutput;
 import java.io.IOException;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluatorFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
diff --git a/hyracks-algebricks/hyracks-algebricks-tests/src/main/java/edu/uci/ics/hyracks/algebricks/tests/pushruntime/IntegerConstantEvalFactory.java b/hyracks-algebricks/hyracks-algebricks-tests/src/main/java/edu/uci/ics/hyracks/algebricks/tests/pushruntime/IntegerConstantEvalFactory.java
index 880a4df..e48fccf 100644
--- a/hyracks-algebricks/hyracks-algebricks-tests/src/main/java/edu/uci/ics/hyracks/algebricks/tests/pushruntime/IntegerConstantEvalFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-tests/src/main/java/edu/uci/ics/hyracks/algebricks/tests/pushruntime/IntegerConstantEvalFactory.java
@@ -17,9 +17,9 @@
 import java.io.DataOutput;
 import java.io.IOException;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluatorFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
diff --git a/hyracks-algebricks/hyracks-algebricks-tests/src/main/java/edu/uci/ics/hyracks/algebricks/tests/pushruntime/IntegerEqualsEvalFactory.java b/hyracks-algebricks/hyracks-algebricks-tests/src/main/java/edu/uci/ics/hyracks/algebricks/tests/pushruntime/IntegerEqualsEvalFactory.java
index e15851b..4c5ce86 100644
--- a/hyracks-algebricks/hyracks-algebricks-tests/src/main/java/edu/uci/ics/hyracks/algebricks/tests/pushruntime/IntegerEqualsEvalFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-tests/src/main/java/edu/uci/ics/hyracks/algebricks/tests/pushruntime/IntegerEqualsEvalFactory.java
@@ -17,9 +17,9 @@
 import java.io.DataOutput;
 import java.io.IOException;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluatorFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
diff --git a/hyracks-algebricks/hyracks-algebricks-tests/src/main/java/edu/uci/ics/hyracks/algebricks/tests/pushruntime/IntegerGreaterThanEvalFactory.java b/hyracks-algebricks/hyracks-algebricks-tests/src/main/java/edu/uci/ics/hyracks/algebricks/tests/pushruntime/IntegerGreaterThanEvalFactory.java
index 5c5d6d4..7eccd13 100644
--- a/hyracks-algebricks/hyracks-algebricks-tests/src/main/java/edu/uci/ics/hyracks/algebricks/tests/pushruntime/IntegerGreaterThanEvalFactory.java
+++ b/hyracks-algebricks/hyracks-algebricks-tests/src/main/java/edu/uci/ics/hyracks/algebricks/tests/pushruntime/IntegerGreaterThanEvalFactory.java
@@ -17,9 +17,9 @@
 import java.io.DataOutput;
 import java.io.IOException;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluator;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluatorFactory;
-import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
diff --git a/hyracks-algebricks/hyracks-algebricks-tests/src/test/java/edu/uci/ics/hyracks/algebricks/tests/pushruntime/PushRuntimeTest.java b/hyracks-algebricks/hyracks-algebricks-tests/src/test/java/edu/uci/ics/hyracks/algebricks/tests/pushruntime/PushRuntimeTest.java
index 0370632..b310f79 100644
--- a/hyracks-algebricks/hyracks-algebricks-tests/src/test/java/edu/uci/ics/hyracks/algebricks/tests/pushruntime/PushRuntimeTest.java
+++ b/hyracks-algebricks/hyracks-algebricks-tests/src/test/java/edu/uci/ics/hyracks/algebricks/tests/pushruntime/PushRuntimeTest.java
@@ -11,40 +11,40 @@
 import org.junit.BeforeClass;
 import org.junit.Test;
 
-import edu.uci.ics.hyracks.algebricks.core.algebra.data.IPrinterFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.aggregators.TupleCountAggregateFunctionFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.aggregators.TupleCountRunningAggregateFunctionFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.AlgebricksPipeline;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IAggregateFunctionFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluatorFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IPushRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IRunningAggregateFunctionFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IUnnestingFunctionFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.evaluators.ColumnAccessEvalFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.data.BinaryBooleanInspectorImpl;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.data.BinaryIntegerInspectorImpl;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.data.IntegerPrinterFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.data.NoopNullWriterFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.jobgen.data.UTF8StringPrinterFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.aggreg.AggregateRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.aggreg.NestedPlansAccumulatingAggregatorFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.aggreg.SimpleAlgebricksAccumulatingAggregatorFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.group.MicroPreClusteredGroupRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.meta.AlgebricksMetaOperatorDescriptor;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.meta.SubplanRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.sort.InMemorySortRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std.AssignRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std.EmptyTupleSourceRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std.NestedTupleSourceRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std.PrinterRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std.RunningAggregateRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std.SinkWriterRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std.StreamLimitRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std.StreamProjectRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std.StreamSelectRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std.StringStreamingRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.std.UnnestRuntimeFactory;
-import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.writers.PrinterBasedWriterFactory;
+import edu.uci.ics.hyracks.algebricks.data.IPrinterFactory;
+import edu.uci.ics.hyracks.algebricks.data.impl.BinaryBooleanInspectorImpl;
+import edu.uci.ics.hyracks.algebricks.data.impl.BinaryIntegerInspectorImpl;
+import edu.uci.ics.hyracks.algebricks.data.impl.IntegerPrinterFactory;
+import edu.uci.ics.hyracks.algebricks.data.impl.NoopNullWriterFactory;
+import edu.uci.ics.hyracks.algebricks.data.impl.UTF8StringPrinterFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.aggregators.TupleCountAggregateFunctionFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.aggregators.TupleCountRunningAggregateFunctionFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.AlgebricksPipeline;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IAggregateFunctionFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IPushRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IRunningAggregateFunctionFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.IUnnestingFunctionFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.evaluators.ColumnAccessEvalFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.aggreg.AggregateRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.aggreg.NestedPlansAccumulatingAggregatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.aggreg.SimpleAlgebricksAccumulatingAggregatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.group.MicroPreClusteredGroupRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.meta.AlgebricksMetaOperatorDescriptor;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.meta.SubplanRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.sort.InMemorySortRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.std.AssignRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.std.EmptyTupleSourceRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.std.NestedTupleSourceRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.std.PrinterRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.std.RunningAggregateRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.std.SinkWriterRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.std.StreamLimitRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.std.StreamProjectRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.std.StreamSelectRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.std.StringStreamingRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.operators.std.UnnestRuntimeFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.writers.PrinterBasedWriterFactory;
 import edu.uci.ics.hyracks.algebricks.tests.util.AlgebricksHyracksIntegrationUtil;
 import edu.uci.ics.hyracks.api.constraints.PartitionConstraintHelper;
 import edu.uci.ics.hyracks.api.dataflow.IOperatorDescriptor;
@@ -75,9 +75,9 @@
 import edu.uci.ics.hyracks.dataflow.std.file.FileSplit;
 import edu.uci.ics.hyracks.dataflow.std.file.IFileSplitProvider;
 import edu.uci.ics.hyracks.dataflow.std.file.LineFileWriteOperatorDescriptor;
-import edu.uci.ics.hyracks.dataflow.std.group.HashGroupOperatorDescriptor;
 import edu.uci.ics.hyracks.dataflow.std.group.IAggregatorDescriptorFactory;
-import edu.uci.ics.hyracks.dataflow.std.group.PreclusteredGroupOperatorDescriptor;
+import edu.uci.ics.hyracks.dataflow.std.group.hash.HashGroupOperatorDescriptor;
+import edu.uci.ics.hyracks.dataflow.std.group.preclustered.PreclusteredGroupOperatorDescriptor;
 import edu.uci.ics.hyracks.dataflow.std.misc.SplitOperatorDescriptor;
 import edu.uci.ics.hyracks.dataflow.std.sort.InMemorySortOperatorDescriptor;
 
diff --git a/hyracks-algebricks/hyracks-algebricks-tests/src/test/java/edu/uci/ics/hyracks/algebricks/tests/tools/WriteValueTest.java b/hyracks-algebricks/hyracks-algebricks-tests/src/test/java/edu/uci/ics/hyracks/algebricks/tests/tools/WriteValueTest.java
index 18f0e75..8a749ed 100644
--- a/hyracks-algebricks/hyracks-algebricks-tests/src/test/java/edu/uci/ics/hyracks/algebricks/tests/tools/WriteValueTest.java
+++ b/hyracks-algebricks/hyracks-algebricks-tests/src/test/java/edu/uci/ics/hyracks/algebricks/tests/tools/WriteValueTest.java
@@ -5,7 +5,7 @@
 
 import org.junit.Test;
 
-import edu.uci.ics.hyracks.algebricks.core.utils.WriteValueTools;
+import edu.uci.ics.hyracks.algebricks.data.utils.WriteValueTools;
 import edu.uci.ics.hyracks.dataflow.common.comm.io.ByteArrayAccessibleOutputStream;
 
 public class WriteValueTest {
diff --git a/hyracks-algebricks/pom.xml b/hyracks-algebricks/pom.xml
index 1e17864..962b6a1 100644
--- a/hyracks-algebricks/pom.xml
+++ b/hyracks-algebricks/pom.xml
@@ -11,7 +11,10 @@
 
   <modules>
     <module>hyracks-algebricks-compiler</module>
+    <module>hyracks-algebricks-common</module>
+    <module>hyracks-algebricks-data</module>
     <module>hyracks-algebricks-core</module>
+    <module>hyracks-algebricks-runtime</module>
     <module>hyracks-algebricks-rewriter</module>
     <module>hyracks-algebricks-tests</module>
     <module>hyracks-algebricks-examples</module>