diff --git a/asterix-algebra/src/main/java/edu/uci/ics/asterix/jobgen/AqlLogicalExpressionJobGen.java b/asterix-algebra/src/main/java/edu/uci/ics/asterix/jobgen/AqlLogicalExpressionJobGen.java
index c21043b..0c73341 100644
--- a/asterix-algebra/src/main/java/edu/uci/ics/asterix/jobgen/AqlLogicalExpressionJobGen.java
+++ b/asterix-algebra/src/main/java/edu/uci/ics/asterix/jobgen/AqlLogicalExpressionJobGen.java
@@ -35,7 +35,7 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema;
 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.ICopyEvaluatorFactory;
 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;
@@ -52,7 +52,7 @@
     public IAggregateFunctionFactory createAggregateFunctionFactory(AggregateFunctionCallExpression expr,
             IVariableTypeEnvironment env, IOperatorSchema[] inputSchemas, JobGenContext context)
             throws AlgebricksException {
-        IEvaluatorFactory[] args = codegenArguments(expr, env, inputSchemas, context);
+        ICopyEvaluatorFactory[] args = codegenArguments(expr, env, inputSchemas, context);
         IFunctionDescriptor fd;
         AqlMetadataProvider mp = (AqlMetadataProvider) context.getMetadataProvider();
         AqlCompiledMetadataDeclarations compiledDecls = mp.getMetadataDeclarations();
@@ -95,7 +95,7 @@
     public IRunningAggregateFunctionFactory createRunningAggregateFunctionFactory(StatefulFunctionCallExpression expr,
             IVariableTypeEnvironment env, IOperatorSchema[] inputSchemas, JobGenContext context)
             throws AlgebricksException {
-        IEvaluatorFactory[] args = codegenArguments(expr, env, inputSchemas, context);
+        ICopyEvaluatorFactory[] args = codegenArguments(expr, env, inputSchemas, context);
         IFunctionDescriptor fd;
         AqlMetadataProvider mp = (AqlMetadataProvider) context.getMetadataProvider();
         AqlCompiledMetadataDeclarations compiledDecls = mp.getMetadataDeclarations();
@@ -132,7 +132,7 @@
     public IUnnestingFunctionFactory createUnnestingFunctionFactory(UnnestingFunctionCallExpression expr,
             IVariableTypeEnvironment env, IOperatorSchema[] inputSchemas, JobGenContext context)
             throws AlgebricksException {
-        IEvaluatorFactory[] args = codegenArguments(expr, env, inputSchemas, context);
+        ICopyEvaluatorFactory[] args = codegenArguments(expr, env, inputSchemas, context);
         IFunctionDescriptor fd;
         AqlMetadataProvider mp = (AqlMetadataProvider) context.getMetadataProvider();
         AqlCompiledMetadataDeclarations compiledDecls = mp.getMetadataDeclarations();
@@ -154,7 +154,7 @@
     }
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(ILogicalExpression expr, IVariableTypeEnvironment env,
+    public ICopyEvaluatorFactory createEvaluatorFactory(ILogicalExpression expr, IVariableTypeEnvironment env,
             IOperatorSchema[] inputSchemas, JobGenContext context) throws AlgebricksException {
         switch (expr.getExpressionTag()) {
             case VARIABLE: {
@@ -181,7 +181,7 @@
         }
     }
 
-    private IEvaluatorFactory createVariableEvaluatorFactory(VariableReferenceExpression expr,
+    private ICopyEvaluatorFactory createVariableEvaluatorFactory(VariableReferenceExpression expr,
             IOperatorSchema[] inputSchemas, JobGenContext context) throws AlgebricksException {
         LogicalVariable variable = expr.getVariableReference();
         for (IOperatorSchema scm : inputSchemas) {
@@ -193,10 +193,10 @@
         throw new AlgebricksException("Variable " + variable + " could not be found in any input schema.");
     }
 
-    private IEvaluatorFactory createScalarFunctionEvaluatorFactory(AbstractFunctionCallExpression expr,
+    private ICopyEvaluatorFactory createScalarFunctionEvaluatorFactory(AbstractFunctionCallExpression expr,
             IVariableTypeEnvironment env, IOperatorSchema[] inputSchemas, JobGenContext context)
             throws AlgebricksException {
-        IEvaluatorFactory[] args = codegenArguments(expr, env, inputSchemas, context);
+        ICopyEvaluatorFactory[] args = codegenArguments(expr, env, inputSchemas, context);
         FunctionIdentifier fi = expr.getFunctionIdentifier();
         ComparisonKind ck = AlgebricksBuiltinFunctions.getComparisonType(fi);
         if (ck != null) {
@@ -226,18 +226,18 @@
 
     }
 
-    private IEvaluatorFactory createConstantEvaluatorFactory(ConstantExpression expr, IOperatorSchema[] inputSchemas,
+    private ICopyEvaluatorFactory createConstantEvaluatorFactory(ConstantExpression expr, IOperatorSchema[] inputSchemas,
             JobGenContext context) throws AlgebricksException {
         AqlMetadataProvider mp = (AqlMetadataProvider) context.getMetadataProvider();
         IDataFormat format = mp == null ? FormatUtils.getDefaultFormat() : mp.getMetadataDeclarations().getFormat();
         return format.getConstantEvalFactory(expr.getValue());
     }
 
-    private IEvaluatorFactory[] codegenArguments(AbstractFunctionCallExpression expr, IVariableTypeEnvironment env,
+    private ICopyEvaluatorFactory[] codegenArguments(AbstractFunctionCallExpression expr, IVariableTypeEnvironment env,
             IOperatorSchema[] inputSchemas, JobGenContext context) throws AlgebricksException {
         List<Mutable<ILogicalExpression>> arguments = expr.getArguments();
         int n = arguments.size();
-        IEvaluatorFactory[] args = new IEvaluatorFactory[n];
+        ICopyEvaluatorFactory[] args = new ICopyEvaluatorFactory[n];
         int i = 0;
         for (Mutable<ILogicalExpression> a : arguments) {
             args[i++] = createEvaluatorFactory(a.getValue(), env, inputSchemas, context);
@@ -249,7 +249,7 @@
     public ISerializableAggregateFunctionFactory createSerializableAggregateFunctionFactory(
             AggregateFunctionCallExpression expr, IVariableTypeEnvironment env, IOperatorSchema[] inputSchemas,
             JobGenContext context) throws AlgebricksException {
-        IEvaluatorFactory[] args = codegenArguments(expr, env, inputSchemas, context);
+        ICopyEvaluatorFactory[] args = codegenArguments(expr, env, inputSchemas, context);
         IFunctionDescriptor fd;
         AqlMetadataProvider mp = (AqlMetadataProvider) context.getMetadataProvider();
         AqlCompiledMetadataDeclarations compiledDecls = mp.getMetadataDeclarations();
diff --git a/asterix-algebra/src/main/java/edu/uci/ics/asterix/optimizer/rules/ConstantFoldingRule.java b/asterix-algebra/src/main/java/edu/uci/ics/asterix/optimizer/rules/ConstantFoldingRule.java
index b6d75bf..bdb4c97 100644
--- a/asterix-algebra/src/main/java/edu/uci/ics/asterix/optimizer/rules/ConstantFoldingRule.java
+++ b/asterix-algebra/src/main/java/edu/uci/ics/asterix/optimizer/rules/ConstantFoldingRule.java
@@ -59,8 +59,8 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionVisitor;
 import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.dataflow.common.comm.util.ByteBufferInputStream;
@@ -175,9 +175,9 @@
                     return new Pair<Boolean, ILogicalExpression>(changed, expr);
                 }
             }
-            IEvaluatorFactory fact = _jobGenCtx.getExpressionJobGen().createEvaluatorFactory(expr, _emptyTypeEnv,
+            ICopyEvaluatorFactory fact = _jobGenCtx.getExpressionJobGen().createEvaluatorFactory(expr, _emptyTypeEnv,
                     _emptySchemas, _jobGenCtx);
-            IEvaluator eval = fact.createEvaluator(resStore);
+            ICopyEvaluator eval = fact.createEvaluator(resStore);
             resStore.reset();
             eval.evaluate(null);
             Object t = _emptyTypeEnv.getType(expr);
diff --git a/asterix-algebra/src/main/java/edu/uci/ics/asterix/optimizer/rules/IntroduceBTreeIndexSearchRule.java b/asterix-algebra/src/main/java/edu/uci/ics/asterix/optimizer/rules/IntroduceBTreeIndexSearchRule.java
index abaf0e2..9e67b2d 100644
--- a/asterix-algebra/src/main/java/edu/uci/ics/asterix/optimizer/rules/IntroduceBTreeIndexSearchRule.java
+++ b/asterix-algebra/src/main/java/edu/uci/ics/asterix/optimizer/rules/IntroduceBTreeIndexSearchRule.java
@@ -52,7 +52,7 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SelectOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.UnnestMapOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.util.OperatorPropertiesUtil;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 
 public class IntroduceBTreeIndexSearchRule extends IntroduceTreeIndexSearchRule {
 
@@ -624,7 +624,7 @@
             Pair<IAType, Boolean> keyPair = AqlCompiledIndexDecl.getNonNullableKeyFieldType(sk, itemType);
             types.add(keyPair.first);
         }
-        for (Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType> t : DatasetUtils
+        for (Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType> t : DatasetUtils
                 .getPartitioningFunctions(ddecl)) {
             types.add(t.third);
         }
diff --git a/asterix-algebra/src/main/java/edu/uci/ics/asterix/optimizer/rules/IntroduceRTreeIndexSearchRule.java b/asterix-algebra/src/main/java/edu/uci/ics/asterix/optimizer/rules/IntroduceRTreeIndexSearchRule.java
index 3a7dec0..de482dd 100644
--- a/asterix-algebra/src/main/java/edu/uci/ics/asterix/optimizer/rules/IntroduceRTreeIndexSearchRule.java
+++ b/asterix-algebra/src/main/java/edu/uci/ics/asterix/optimizer/rules/IntroduceRTreeIndexSearchRule.java
@@ -52,7 +52,7 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SelectOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.UnnestMapOperator;
 import edu.uci.ics.hyracks.algebricks.core.algebra.util.OperatorPropertiesUtil;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 
 public class IntroduceRTreeIndexSearchRule extends IntroduceTreeIndexSearchRule {
 
@@ -386,7 +386,7 @@
         for (int i = 0; i < numKeys; i++) {
             types.add(nestedKeyType);
         }
-        for (Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType> t : DatasetUtils
+        for (Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType> t : DatasetUtils
                 .getPartitioningFunctions(ddecl)) {
             types.add(t.third);
         }
diff --git a/asterix-algebra/src/main/java/edu/uci/ics/asterix/optimizer/rules/IntroduceTreeIndexSearchRule.java b/asterix-algebra/src/main/java/edu/uci/ics/asterix/optimizer/rules/IntroduceTreeIndexSearchRule.java
index 0153519..be00f6d 100644
--- a/asterix-algebra/src/main/java/edu/uci/ics/asterix/optimizer/rules/IntroduceTreeIndexSearchRule.java
+++ b/asterix-algebra/src/main/java/edu/uci/ics/asterix/optimizer/rules/IntroduceTreeIndexSearchRule.java
@@ -21,7 +21,7 @@
 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.rewriter.base.IAlgebraicRewriteRule;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 
 public abstract class IntroduceTreeIndexSearchRule implements IAlgebraicRewriteRule {
 
@@ -96,9 +96,9 @@
     protected static List<Object> primaryIndexTypes(AqlCompiledMetadataDeclarations metadata,
             AqlCompiledDatasetDecl ddecl, IAType itemType) {
         List<Object> types = new ArrayList<Object>();
-        List<Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitioningFunctions = DatasetUtils
+        List<Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitioningFunctions = DatasetUtils
                 .getPartitioningFunctions(ddecl);
-        for (Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType> t : partitioningFunctions) {
+        for (Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType> t : partitioningFunctions) {
             types.add(t.third);
         }
         types.add(itemType);
diff --git a/asterix-algebra/src/main/java/edu/uci/ics/asterix/translator/AqlPlusExpressionToPlanTranslator.java b/asterix-algebra/src/main/java/edu/uci/ics/asterix/translator/AqlPlusExpressionToPlanTranslator.java
index 2e45da4..e6aaaad 100644
--- a/asterix-algebra/src/main/java/edu/uci/ics/asterix/translator/AqlPlusExpressionToPlanTranslator.java
+++ b/asterix-algebra/src/main/java/edu/uci/ics/asterix/translator/AqlPlusExpressionToPlanTranslator.java
@@ -141,7 +141,7 @@
 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.plan.ALogicalPlanImpl;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 
 /**
  * 
@@ -265,7 +265,7 @@
             ArrayList<LogicalVariable> vars = new ArrayList<LogicalVariable>();
             ArrayList<Mutable<ILogicalExpression>> exprs = new ArrayList<Mutable<ILogicalExpression>>();
             List<Mutable<ILogicalExpression>> varRefsForLoading = new ArrayList<Mutable<ILogicalExpression>>();
-            for (Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType> partitioner : DatasetUtils
+            for (Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType> partitioner : DatasetUtils
                     .getPartitioningFunctions(adecl)) {
                 AbstractFunctionCallExpression f = partitioner.second.cloneExpression();
                 f.substituteVar(METADATA_DUMMY_VAR, resVar);
diff --git a/asterix-app/src/main/java/edu/uci/ics/asterix/file/DatasetOperations.java b/asterix-app/src/main/java/edu/uci/ics/asterix/file/DatasetOperations.java
index 2b341db..e996c1a 100644
--- a/asterix-app/src/main/java/edu/uci/ics/asterix/file/DatasetOperations.java
+++ b/asterix-app/src/main/java/edu/uci/ics/asterix/file/DatasetOperations.java
@@ -45,7 +45,7 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.ScalarFunctionCallExpression;
 import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.ConnectorPolicyAssignmentPolicy;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.PhysicalOptimizationConfig;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.algebricks.runtime.base.IPushRuntimeFactory;
 import edu.uci.ics.hyracks.algebricks.runtime.operators.meta.AlgebricksMetaOperatorDescriptor;
 import edu.uci.ics.hyracks.algebricks.runtime.operators.std.AssignRuntimeFactory;
@@ -208,7 +208,7 @@
 
         AlgebricksPartitionConstraintHelper.setPartitionConstraintInJobSpec(spec, asterixOp, scannerPc);
 
-        List<Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitioningFunctions = DatasetUtils
+        List<Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitioningFunctions = DatasetUtils
                 .getPartitioningFunctions(compiledDatasetDecl);
         int numKeys = partitioningFunctions.size();
         int[] keys = new int[numKeys];
@@ -269,12 +269,12 @@
     }
 
     private static AssignRuntimeFactory makeAssignRuntimeFactory(AqlCompiledDatasetDecl compiledDatasetDecl) {
-        List<Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitioningFunctions = DatasetUtils
+        List<Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitioningFunctions = DatasetUtils
                 .getPartitioningFunctions(compiledDatasetDecl);
         int numKeys = partitioningFunctions.size();
-        IEvaluatorFactory[] evalFactories = new IEvaluatorFactory[numKeys];
+        ICopyEvaluatorFactory[] evalFactories = new ICopyEvaluatorFactory[numKeys];
         for (int i = 0; i < numKeys; i++) {
-            Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType> evalFactoryAndType = partitioningFunctions
+            Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType> evalFactoryAndType = partitioningFunctions
                     .get(i);
             evalFactories[i] = evalFactoryAndType.first;
         }
@@ -291,13 +291,13 @@
 
     private static RecordDescriptor computePayloadKeyRecordDescriptor(AqlCompiledDatasetDecl compiledDatasetDecl,
             ISerializerDeserializer payloadSerde, IDataFormat dataFormat) throws AlgebricksException {
-        List<Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitioningFunctions = DatasetUtils
+        List<Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitioningFunctions = DatasetUtils
                 .getPartitioningFunctions(compiledDatasetDecl);
         int numKeys = partitioningFunctions.size();
         ISerializerDeserializer[] recordFields = new ISerializerDeserializer[1 + numKeys];
         recordFields[0] = payloadSerde;
         for (int i = 0; i < numKeys; i++) {
-            Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType> evalFactoryAndType = partitioningFunctions
+            Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType> evalFactoryAndType = partitioningFunctions
                     .get(i);
             IAType keyType = evalFactoryAndType.third;
             ISerializerDeserializer keySerde = dataFormat.getSerdeProvider().getSerializerDeserializer(keyType);
diff --git a/asterix-app/src/main/java/edu/uci/ics/asterix/file/FeedOperations.java b/asterix-app/src/main/java/edu/uci/ics/asterix/file/FeedOperations.java
index 896dcd7..3fd75d0 100644
--- a/asterix-app/src/main/java/edu/uci/ics/asterix/file/FeedOperations.java
+++ b/asterix-app/src/main/java/edu/uci/ics/asterix/file/FeedOperations.java
@@ -38,7 +38,7 @@
 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.expressions.ScalarFunctionCallExpression;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.algebricks.runtime.operators.std.AssignRuntimeFactory;
 import edu.uci.ics.hyracks.api.dataflow.IOperatorDescriptor;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
@@ -126,13 +126,13 @@
     }
 
     private static AssignRuntimeFactory makeAssignRuntimeFactory(AqlCompiledDatasetDecl compiledDatasetDecl) {
-        List<Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitioningFunctions = DatasetUtils
+        List<Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitioningFunctions = DatasetUtils
                 .getPartitioningFunctions(compiledDatasetDecl);
         int numKeys = partitioningFunctions.size();
-        IEvaluatorFactory[] evalFactories = new IEvaluatorFactory[numKeys];
+        ICopyEvaluatorFactory[] evalFactories = new ICopyEvaluatorFactory[numKeys];
 
         int index = 0;
-        for (Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType> evalFactoryAndType : partitioningFunctions) {
+        for (Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType> evalFactoryAndType : partitioningFunctions) {
             evalFactories[index++] = evalFactoryAndType.first;
         }
 
@@ -151,13 +151,13 @@
     private static RecordDescriptor computePayloadKeyRecordDescriptor(AqlCompiledDatasetDecl compiledDatasetDecl,
             ISerializerDeserializer payloadSerde, IDataFormat dataFormat) throws AlgebricksException {
 
-        List<Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitioningFunctions = DatasetUtils
+        List<Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitioningFunctions = DatasetUtils
                 .getPartitioningFunctions(compiledDatasetDecl);
         int numKeys = partitioningFunctions.size();
         ISerializerDeserializer[] recordFields = new ISerializerDeserializer[1 + numKeys];
         recordFields[0] = payloadSerde;
         int index = 0;
-        for (Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType> evalFactoryAndType : partitioningFunctions) {
+        for (Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType> evalFactoryAndType : partitioningFunctions) {
             IAType keyType = evalFactoryAndType.third;
             ISerializerDeserializer keySerde = dataFormat.getSerdeProvider().getSerializerDeserializer(keyType);
             recordFields[index + 1] = keySerde;
diff --git a/asterix-app/src/main/java/edu/uci/ics/asterix/file/SecondaryIndexCreator.java b/asterix-app/src/main/java/edu/uci/ics/asterix/file/SecondaryIndexCreator.java
index 7da18fb..bffd1c4 100644
--- a/asterix-app/src/main/java/edu/uci/ics/asterix/file/SecondaryIndexCreator.java
+++ b/asterix-app/src/main/java/edu/uci/ics/asterix/file/SecondaryIndexCreator.java
@@ -30,7 +30,7 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.ScalarFunctionCallExpression;
 import edu.uci.ics.hyracks.algebricks.core.rewriter.base.PhysicalOptimizationConfig;
 import edu.uci.ics.hyracks.algebricks.data.ISerializerDeserializerProvider;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.algebricks.runtime.base.IPushRuntimeFactory;
 import edu.uci.ics.hyracks.algebricks.runtime.evaluators.ColumnAccessEvalFactory;
 import edu.uci.ics.hyracks.algebricks.runtime.operators.meta.AlgebricksMetaOperatorDescriptor;
@@ -78,7 +78,7 @@
     protected RecordDescriptor primaryRecDesc;
     protected IBinaryComparatorFactory[] secondaryComparatorFactories;
     protected RecordDescriptor secondaryRecDesc;
-    protected IEvaluatorFactory[] evalFactories;
+    protected ICopyEvaluatorFactory[] evalFactories;
     
     // Prevent public construction. Should be created via createIndexCreator().
     protected SecondaryIndexCreator(PhysicalOptimizationConfig physOptConf) {
@@ -147,10 +147,10 @@
         ITypeTraits[] primaryTypeTraits = new ITypeTraits[numPrimaryKeys + 1];
         primaryComparatorFactories = new IBinaryComparatorFactory[numPrimaryKeys];
         ISerializerDeserializerProvider serdeProvider = metadata.getFormat().getSerdeProvider();
-        List<Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitioningFunctions = DatasetUtils
+        List<Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitioningFunctions = DatasetUtils
                 .getPartitioningFunctions(datasetDecl);
         int i = 0;
-        for (Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType> evalFactoryAndType : partitioningFunctions) {
+        for (Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType> evalFactoryAndType : partitioningFunctions) {
             IAType keyType = evalFactoryAndType.third;
             ISerializerDeserializer keySerde = serdeProvider.getSerializerDeserializer(keyType);
             primaryRecFields[i] = keySerde;
@@ -165,7 +165,7 @@
     }
     
     protected void setSecondaryRecDescAndComparators(List<String> secondaryKeyFields) throws AlgebricksException, AsterixException {
-        evalFactories = new IEvaluatorFactory[numSecondaryKeys];
+        evalFactories = new ICopyEvaluatorFactory[numSecondaryKeys];
         secondaryComparatorFactories = new IBinaryComparatorFactory[numSecondaryKeys + numPrimaryKeys];
         ISerializerDeserializer[] secondaryRecFields = new ISerializerDeserializer[numPrimaryKeys + numSecondaryKeys];
         ITypeTraits[] secondaryTypeTraits = new ITypeTraits[numSecondaryKeys + numPrimaryKeys];
@@ -284,17 +284,17 @@
     }
     
     public AlgebricksMetaOperatorDescriptor createFilterNullsSelectOp(JobSpecification spec, int numSecondaryKeyFields) throws AlgebricksException {
-        IEvaluatorFactory[] andArgsEvalFactories = new IEvaluatorFactory[numSecondaryKeyFields];
+        ICopyEvaluatorFactory[] andArgsEvalFactories = new ICopyEvaluatorFactory[numSecondaryKeyFields];
         NotDescriptor notDesc = new NotDescriptor();
         IsNullDescriptor isNullDesc = new IsNullDescriptor();
         for (int i = 0; i < numSecondaryKeyFields; i++) {
             // Access column i, and apply 'is not null'.
             ColumnAccessEvalFactory columnAccessEvalFactory = new ColumnAccessEvalFactory(i);
-            IEvaluatorFactory isNullEvalFactory = isNullDesc.createEvaluatorFactory(new IEvaluatorFactory[] { columnAccessEvalFactory });
-            IEvaluatorFactory notEvalFactory = notDesc.createEvaluatorFactory(new IEvaluatorFactory[] { isNullEvalFactory });
+            ICopyEvaluatorFactory isNullEvalFactory = isNullDesc.createEvaluatorFactory(new ICopyEvaluatorFactory[] { columnAccessEvalFactory });
+            ICopyEvaluatorFactory notEvalFactory = notDesc.createEvaluatorFactory(new ICopyEvaluatorFactory[] { isNullEvalFactory });
             andArgsEvalFactories[i] = notEvalFactory;
         }
-        IEvaluatorFactory selectCond = null;
+        ICopyEvaluatorFactory selectCond = null;
         if (numSecondaryKeyFields > 1) {
             // Create conjunctive condition where all secondary index keys must satisfy 'is not null'.
             AndDescriptor andDesc = new AndDescriptor();
diff --git a/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/declared/AqlCompiledFeedDatasetDetails.java b/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/declared/AqlCompiledFeedDatasetDetails.java
index 64503c4..5cfc8be 100644
--- a/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/declared/AqlCompiledFeedDatasetDetails.java
+++ b/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/declared/AqlCompiledFeedDatasetDetails.java
@@ -21,7 +21,7 @@
 import edu.uci.ics.asterix.om.types.IAType;
 import edu.uci.ics.hyracks.algebricks.common.utils.Triple;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.ScalarFunctionCallExpression;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 
 public class AqlCompiledFeedDatasetDetails extends
 		AqlCompiledInternalDatasetDetails {
@@ -32,7 +32,7 @@
 
 	public AqlCompiledFeedDatasetDetails(
 			List<String> partitioningExprs,
-			List<Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitionFuns,
+			List<Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitionFuns,
 			String nodegroupName, AqlCompiledIndexDecl primaryIndex,
 			List<AqlCompiledIndexDecl> secondaryIndexes, String adapter,
 			Map<String, String> properties, String functionIdentifier,
diff --git a/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/declared/AqlCompiledInternalDatasetDetails.java b/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/declared/AqlCompiledInternalDatasetDetails.java
index 36c53cc..912b766 100644
--- a/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/declared/AqlCompiledInternalDatasetDetails.java
+++ b/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/declared/AqlCompiledInternalDatasetDetails.java
@@ -22,18 +22,18 @@
 import edu.uci.ics.asterix.om.types.IAType;
 import edu.uci.ics.hyracks.algebricks.common.utils.Triple;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.ScalarFunctionCallExpression;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 
 public class AqlCompiledInternalDatasetDetails implements IAqlCompiledDatasetDetails {
     private final List<String> partitioningExprs;
-    private final List<Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitionFuns;
+    private final List<Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitionFuns;
     private final String nodegroupName;
     private final List<AqlCompiledIndexDecl> secondaryIndexes;
     private final AqlCompiledIndexDecl primaryIndex;
     private HashMap<String, List<AqlCompiledIndexDecl>> secondaryIndexInvertedList;
 
     public AqlCompiledInternalDatasetDetails(List<String> partitioningExprs,
-            List<Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitionFuns, String nodegroupName,
+            List<Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitionFuns, String nodegroupName,
             AqlCompiledIndexDecl primaryIndex, List<AqlCompiledIndexDecl> secondaryIndexes) {
         this.partitioningExprs = partitioningExprs;
         this.partitionFuns = partitionFuns;
@@ -52,7 +52,7 @@
         return sb.toString();
     }
 
-    public List<Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType>> getPartitioningFunctions() {
+    public List<Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType>> getPartitioningFunctions() {
         return partitionFuns;
     }
 
diff --git a/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/declared/AqlCompiledMetadataDeclarations.java b/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/declared/AqlCompiledMetadataDeclarations.java
index 418eac5..c76208c 100644
--- a/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/declared/AqlCompiledMetadataDeclarations.java
+++ b/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/declared/AqlCompiledMetadataDeclarations.java
@@ -49,7 +49,7 @@
 import edu.uci.ics.hyracks.algebricks.common.utils.Triple;
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.ScalarFunctionCallExpression;
 import edu.uci.ics.hyracks.algebricks.data.IAWriterFactory;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.io.FileReference;
 import edu.uci.ics.hyracks.dataflow.std.file.ConstantFileSplitProvider;
 import edu.uci.ics.hyracks.dataflow.std.file.FileSplit;
@@ -187,7 +187,7 @@
                     String typeName = datasetRecord.getDatatypeName();
                     InternalDatasetDetails id = (InternalDatasetDetails) datasetRecord.getDatasetDetails();
                     ARecordType recType = (ARecordType) findType(typeName);
-                    List<Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitioningEvalFactories = computePartitioningEvaluatorFactories(
+                    List<Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitioningEvalFactories = computePartitioningEvaluatorFactories(
                             id.getPartitioningKey(), recType);
                     List<Index> indexRecord = this.metadataManager.getDatasetIndexes(mdTxnCtx, dataverseName,
                             datasetName);
@@ -239,12 +239,12 @@
         this.outputFile = outputFile;
     }
 
-    public List<Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType>> computePartitioningEvaluatorFactories(
+    public List<Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType>> computePartitioningEvaluatorFactories(
             List<String> partitioningExprs, ARecordType recType) {
-        List<Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType>> evalFactories = new ArrayList<Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType>>(
+        List<Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType>> evalFactories = new ArrayList<Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType>>(
                 partitioningExprs.size());
         for (String expr : partitioningExprs) {
-            Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType> evalFact = null;
+            Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType> evalFact = null;
             try {
                 evalFact = format.partitioningEvaluatorFactory(recType, expr);
             } catch (AlgebricksException e) {
diff --git a/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/declared/AqlDataSource.java b/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/declared/AqlDataSource.java
index 2545926..4ae38eb 100644
--- a/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/declared/AqlDataSource.java
+++ b/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/declared/AqlDataSource.java
@@ -41,7 +41,7 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.properties.RandomPartitioningProperty;
 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.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 
 public class AqlDataSource implements IDataSource<AqlSourceId> {
 
@@ -102,7 +102,7 @@
     }
 
     private void initInternalDataset(IAType itemType) {
-        List<Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitioningFunctions = DatasetUtils
+        List<Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitioningFunctions = DatasetUtils
                 .getPartitioningFunctions(adecl);
         int n = partitioningFunctions.size();
         schemaTypes = new IAType[n + 1];
@@ -118,7 +118,7 @@
         if (decl.getAqlCompiledDatasetDetails() instanceof AqlCompiledExternalDatasetDetails) {
             initExternalDataset(itemType);
         } else {
-            List<Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitioningFunctions = DatasetUtils
+            List<Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitioningFunctions = DatasetUtils
                     .getPartitioningFunctions(adecl);
             int n = partitioningFunctions.size();
             schemaTypes = new IAType[n + 1];
diff --git a/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/declared/AqlMetadataProvider.java b/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/declared/AqlMetadataProvider.java
index d8e340c..397de61 100644
--- a/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/declared/AqlMetadataProvider.java
+++ b/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/declared/AqlMetadataProvider.java
@@ -62,7 +62,7 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema;
 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.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.algebricks.runtime.base.IPushRuntimeFactory;
 import edu.uci.ics.hyracks.algebricks.runtime.operators.std.SinkWriterRuntimeFactory;
 import edu.uci.ics.hyracks.api.dataflow.IOperatorDescriptor;
@@ -359,7 +359,7 @@
             typeTraits[numPrimaryKeys] = AqlTypeTraitProvider.INSTANCE.getTypeTrait(itemType);
         }
 
-        for (Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType> evalFactoryAndType : DatasetUtils
+        for (Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType> evalFactoryAndType : DatasetUtils
                 .getPartitioningFunctions(ddecl)) {
             IAType keyType = evalFactoryAndType.third;
             ISerializerDeserializer keySerde = metadata.getFormat().getSerdeProvider()
@@ -468,7 +468,7 @@
             throw new AlgebricksException("R-tree can only be used as a secondary index");
         }
 
-        for (Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType> evalFactoryAndType : DatasetUtils
+        for (Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType> evalFactoryAndType : DatasetUtils
                 .getPartitioningFunctions(ddecl)) {
             IAType keyType = evalFactoryAndType.third;
             ISerializerDeserializer keySerde = AqlSerializerDeserializerProvider.INSTANCE
@@ -757,7 +757,7 @@
             return null;
         }
         ILogicalExpressionJobGen exprJobGen = context.getExpressionJobGen();
-        IEvaluatorFactory filterEvalFactory = exprJobGen.createEvaluatorFactory(filterExpr, typeEnv, inputSchemas,
+        ICopyEvaluatorFactory filterEvalFactory = exprJobGen.createEvaluatorFactory(filterExpr, typeEnv, inputSchemas,
                 context);
         return new AsterixTupleFilterFactory(filterEvalFactory, context.getBinaryBooleanInspector());
     }
@@ -809,7 +809,7 @@
                     true);
             typeTraits[i] = AqlTypeTraitProvider.INSTANCE.getTypeTrait(keyType);
         }
-        for (Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType> evalFactoryAndType : DatasetUtils
+        for (Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType> evalFactoryAndType : DatasetUtils
                 .getPartitioningFunctions(compiledDatasetDecl)) {
             IAType keyType = evalFactoryAndType.third;
             comparatorFactories[i] = AqlBinaryComparatorFactoryProvider.INSTANCE.getBinaryComparatorFactory(keyType,
@@ -883,7 +883,7 @@
             typeTraits[i] = AqlTypeTraitProvider.INSTANCE.getTypeTrait(nestedKeyType);
             valueProviderFactories[i] = AqlPrimitiveValueProviderFactory.INSTANCE;
         }
-        for (Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType> evalFactoryAndType : DatasetUtils
+        for (Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType> evalFactoryAndType : DatasetUtils
                 .getPartitioningFunctions(compiledDatasetDecl)) {
             IAType keyType = evalFactoryAndType.third;
             comparatorFactories[i] = AqlBinaryComparatorFactoryProvider.INSTANCE.getBinaryComparatorFactory(keyType,
diff --git a/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/utils/DatasetUtils.java b/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/utils/DatasetUtils.java
index b7f0f75..a34f14b 100644
--- a/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/utils/DatasetUtils.java
+++ b/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/utils/DatasetUtils.java
@@ -14,7 +14,7 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.ScalarFunctionCallExpression;
 import edu.uci.ics.hyracks.algebricks.data.IBinaryComparatorFactoryProvider;
 import edu.uci.ics.hyracks.algebricks.data.IBinaryHashFunctionFactoryProvider;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 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.ITypeTraits;
@@ -25,12 +25,12 @@
             throws AlgebricksException {
         if (compiledDatasetDecl.getDatasetType() == DatasetType.EXTERNAL)
             throw new AlgebricksException("not implemented");
-        List<Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitioningFunctions;
+        List<Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitioningFunctions;
         partitioningFunctions = getPartitioningFunctions(compiledDatasetDecl);
         int numKeys = partitioningFunctions.size();
         IBinaryComparatorFactory[] bcfs = new IBinaryComparatorFactory[numKeys];
         for (int i = 0; i < numKeys; i++) {
-            Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType> evalFactoryAndType = partitioningFunctions
+            Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType> evalFactoryAndType = partitioningFunctions
                     .get(i);
             IAType keyType = evalFactoryAndType.third;
             bcfs[i] = comparatorFactoryProvider.getBinaryComparatorFactory(keyType, true);
@@ -43,13 +43,13 @@
             throws AlgebricksException {
         if (compiledDatasetDecl.getDatasetType() == DatasetType.EXTERNAL)
             throw new AlgebricksException("not implemented");
-        List<Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitioningFunctions;
+        List<Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitioningFunctions;
         partitioningFunctions = ((AqlCompiledInternalDatasetDetails) compiledDatasetDecl.getAqlCompiledDatasetDetails())
                 .getPartitioningFunctions();
         int numKeys = partitioningFunctions.size();
         IBinaryHashFunctionFactory[] bhffs = new IBinaryHashFunctionFactory[numKeys];
         for (int i = 0; i < numKeys; i++) {
-            Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType> evalFactoryAndType = partitioningFunctions
+            Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType> evalFactoryAndType = partitioningFunctions
                     .get(i);
             IAType keyType = evalFactoryAndType.third;
             bhffs[i] = hashFunProvider.getBinaryHashFunctionFactory(keyType);
@@ -61,13 +61,13 @@
             AqlCompiledMetadataDeclarations datasetDecls) throws AlgebricksException {
         if (compiledDatasetDecl.getDatasetType() == DatasetType.EXTERNAL)
             throw new AlgebricksException("not implemented");
-        List<Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitioningFunctions;
+        List<Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType>> partitioningFunctions;
         partitioningFunctions = ((AqlCompiledInternalDatasetDetails) compiledDatasetDecl.getAqlCompiledDatasetDetails())
                 .getPartitioningFunctions();
         int numKeys = partitioningFunctions.size();
         ITypeTraits[] typeTraits = new ITypeTraits[numKeys + 1];
         for (int i = 0; i < numKeys; i++) {
-            Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType> evalFactoryAndType = partitioningFunctions
+            Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType> evalFactoryAndType = partitioningFunctions
                     .get(i);
             IAType keyType = evalFactoryAndType.third;
             typeTraits[i] = AqlTypeTraitProvider.INSTANCE.getTypeTrait(keyType);
@@ -77,7 +77,7 @@
         return typeTraits;
     }
 
-    public static List<Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType>> getPartitioningFunctions(
+    public static List<Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType>> getPartitioningFunctions(
             AqlCompiledDatasetDecl decl) {
         return ((AqlCompiledInternalDatasetDetails) decl.getAqlCompiledDatasetDetails()).getPartitioningFunctions();
     }
diff --git a/asterix-om/src/main/java/edu/uci/ics/asterix/formats/base/IDataFormat.java b/asterix-om/src/main/java/edu/uci/ics/asterix/formats/base/IDataFormat.java
index 9142d9e..9da5b8b 100644
--- a/asterix-om/src/main/java/edu/uci/ics/asterix/formats/base/IDataFormat.java
+++ b/asterix-om/src/main/java/edu/uci/ics/asterix/formats/base/IDataFormat.java
@@ -20,7 +20,7 @@
 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.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.INullWriterFactory;
 import edu.uci.ics.hyracks.dataflow.std.file.ITupleParserFactory;
 
@@ -43,10 +43,10 @@
 
     public INullWriterFactory getNullWriterFactory();
 
-    public Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType> partitioningEvaluatorFactory(
+    public Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType> partitioningEvaluatorFactory(
             ARecordType recType, String fldName) throws AlgebricksException;
 
-    public IEvaluatorFactory getFieldAccessEvaluatorFactory(ARecordType recType, String fldName, int recordColumn)
+    public ICopyEvaluatorFactory getFieldAccessEvaluatorFactory(ARecordType recType, String fldName, int recordColumn)
             throws AlgebricksException;
 
     public ITupleParserFactory createTupleParser(ARecordType recType, IParseFileSplitsDecl decl);
@@ -56,9 +56,9 @@
     public IFunctionDescriptor resolveFunction(ILogicalExpression expr, IVariableTypeEnvironment typeEnvironment)
             throws AlgebricksException;
 
-    public IEvaluatorFactory getConstantEvalFactory(IAlgebricksConstantValue value) throws AlgebricksException;
+    public ICopyEvaluatorFactory getConstantEvalFactory(IAlgebricksConstantValue value) throws AlgebricksException;
 
-    public IEvaluatorFactory[] createMBRFactory(ARecordType recType, String fldName, int recordColumn, int dimension)
+    public ICopyEvaluatorFactory[] createMBRFactory(ARecordType recType, String fldName, int recordColumn, int dimension)
             throws AlgebricksException;
 
     public IExpressionEvalSizeComputer getExpressionEvalSizeComputer();
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/collections/ListifyAggregateDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/collections/ListifyAggregateDescriptor.java
index c238af4..2ec2cc6 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/collections/ListifyAggregateDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/collections/ListifyAggregateDescriptor.java
@@ -8,7 +8,7 @@
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
 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.ICopyEvaluatorFactory;
 
 public class ListifyAggregateDescriptor extends AbstractAggregateFunctionDynamicDescriptor {
 
@@ -33,7 +33,7 @@
     }
 
     @Override
-    public IAggregateFunctionFactory createAggregateFunctionFactory(final IEvaluatorFactory[] args)
+    public IAggregateFunctionFactory createAggregateFunctionFactory(final ICopyEvaluatorFactory[] args)
             throws AlgebricksException {
         return new ListifyAggregateFunctionEvalFactory(args, oltype);
     }
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/collections/ListifyAggregateFunctionEvalFactory.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/collections/ListifyAggregateFunctionEvalFactory.java
index 84ebe91..df626c8 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/collections/ListifyAggregateFunctionEvalFactory.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/collections/ListifyAggregateFunctionEvalFactory.java
@@ -8,8 +8,8 @@
 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.base.IEvaluator;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 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;
@@ -18,10 +18,10 @@
 public class ListifyAggregateFunctionEvalFactory implements IAggregateFunctionFactory {
 
     private static final long serialVersionUID = 1L;
-    private IEvaluatorFactory[] args;
+    private ICopyEvaluatorFactory[] args;
     private final AOrderedListType orderedlistType;
 
-    public ListifyAggregateFunctionEvalFactory(IEvaluatorFactory[] args, AOrderedListType type) {
+    public ListifyAggregateFunctionEvalFactory(ICopyEvaluatorFactory[] args, AOrderedListType type) {
         this.args = args;
         this.orderedlistType = type;
     }
@@ -32,7 +32,7 @@
         return new IAggregateFunction() {
 
             private ArrayBackedValueStorage inputVal = new ArrayBackedValueStorage();
-            private IEvaluator eval = args[0].createEvaluator(inputVal);
+            private ICopyEvaluator eval = args[0].createEvaluator(inputVal);
             private DataOutput out = provider.getDataOutput();
             private OrderedListBuilder builder = new OrderedListBuilder();
 
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/serializable/std/SerializableAvgAggregateDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/serializable/std/SerializableAvgAggregateDescriptor.java
index 5c6aa8e..d4bba74 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/serializable/std/SerializableAvgAggregateDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/serializable/std/SerializableAvgAggregateDescriptor.java
@@ -24,8 +24,8 @@
 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.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.algebricks.runtime.base.ISerializableAggregateFunction;
 import edu.uci.ics.hyracks.algebricks.runtime.base.ISerializableAggregateFunctionFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
@@ -49,9 +49,9 @@
     }
 
     @Override
-    public ISerializableAggregateFunctionFactory createAggregateFunctionFactory(IEvaluatorFactory[] args)
+    public ISerializableAggregateFunctionFactory createAggregateFunctionFactory(ICopyEvaluatorFactory[] args)
             throws AlgebricksException {
-        final IEvaluatorFactory[] evals = args;
+        final ICopyEvaluatorFactory[] evals = args;
 
         return new ISerializableAggregateFunctionFactory() {
             private static final long serialVersionUID = 1L;
@@ -59,7 +59,7 @@
             public ISerializableAggregateFunction createAggregateFunction() throws AlgebricksException {
                 return new ISerializableAggregateFunction() {
                     private ArrayBackedValueStorage inputVal = new ArrayBackedValueStorage();
-                    private IEvaluator eval = evals[0].createEvaluator(inputVal);
+                    private ICopyEvaluator eval = evals[0].createEvaluator(inputVal);
 
                     private AMutableDouble aDouble = new AMutableDouble(0);
                     @SuppressWarnings("unchecked")
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/serializable/std/SerializableCountAggregateDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/serializable/std/SerializableCountAggregateDescriptor.java
index 0c96111..feac690 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/serializable/std/SerializableCountAggregateDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/serializable/std/SerializableCountAggregateDescriptor.java
@@ -13,7 +13,7 @@
 import edu.uci.ics.asterix.runtime.aggregates.base.AbstractSerializableAggregateFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.algebricks.runtime.base.ISerializableAggregateFunction;
 import edu.uci.ics.hyracks.algebricks.runtime.base.ISerializableAggregateFunctionFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
@@ -39,7 +39,7 @@
     }
 
     @Override
-    public ISerializableAggregateFunctionFactory createAggregateFunctionFactory(final IEvaluatorFactory[] args)
+    public ISerializableAggregateFunctionFactory createAggregateFunctionFactory(final ICopyEvaluatorFactory[] args)
             throws AlgebricksException {
         return new ISerializableAggregateFunctionFactory() {
             private static final long serialVersionUID = 1L;
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/serializable/std/SerializableGlobalAvgAggregateDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/serializable/std/SerializableGlobalAvgAggregateDescriptor.java
index 5b647d4..ee81e88 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/serializable/std/SerializableGlobalAvgAggregateDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/serializable/std/SerializableGlobalAvgAggregateDescriptor.java
@@ -30,8 +30,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.common.ClosedRecordConstructorEvalFactory.ClosedRecordConstructorEval;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.algebricks.runtime.base.ISerializableAggregateFunction;
 import edu.uci.ics.hyracks.algebricks.runtime.base.ISerializableAggregateFunctionFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
@@ -58,9 +58,9 @@
     }
 
     @Override
-    public ISerializableAggregateFunctionFactory createAggregateFunctionFactory(IEvaluatorFactory[] args)
+    public ISerializableAggregateFunctionFactory createAggregateFunctionFactory(ICopyEvaluatorFactory[] args)
             throws AlgebricksException {
-        final IEvaluatorFactory[] evals = args;
+        final ICopyEvaluatorFactory[] evals = args;
         List<IAType> unionList = new ArrayList<IAType>();
         unionList.add(BuiltinType.ANULL);
         unionList.add(BuiltinType.ADOUBLE);
@@ -75,7 +75,7 @@
 
                 return new ISerializableAggregateFunction() {
                     private ArrayBackedValueStorage inputVal = new ArrayBackedValueStorage();
-                    private IEvaluator eval = evals[0].createEvaluator(inputVal);
+                    private ICopyEvaluator eval = evals[0].createEvaluator(inputVal);
                     private AMutableDouble aDouble = new AMutableDouble(0);
                     private AMutableInt64 aInt64 = new AMutableInt64(0);
 
@@ -84,8 +84,8 @@
                     private DataOutput sumBytesOutput = new DataOutputStream(sumBytes);
                     private ByteArrayAccessibleOutputStream countBytes = new ByteArrayAccessibleOutputStream();
                     private DataOutput countBytesOutput = new DataOutputStream(countBytes);
-                    private IEvaluator evalSum = new AccessibleByteArrayEval(avgBytes.getDataOutput(), sumBytes);
-                    private IEvaluator evalCount = new AccessibleByteArrayEval(avgBytes.getDataOutput(), countBytes);
+                    private ICopyEvaluator evalSum = new AccessibleByteArrayEval(avgBytes.getDataOutput(), sumBytes);
+                    private ICopyEvaluator evalCount = new AccessibleByteArrayEval(avgBytes.getDataOutput(), countBytes);
                     private ClosedRecordConstructorEval recordEval;
 
                     @SuppressWarnings("unchecked")
@@ -171,7 +171,7 @@
 
                         if (recordEval == null)
                             recordEval = new ClosedRecordConstructorEval(recType,
-                                    new IEvaluator[] { evalSum, evalCount }, avgBytes, result);
+                                    new ICopyEvaluator[] { evalSum, evalCount }, avgBytes, result);
 
                         if (globalCount == 0) {
                             GlobalConfig.ASTERIX_LOGGER.fine("AVG aggregate ran over empty input.");
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/serializable/std/SerializableLocalAvgAggregateDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/serializable/std/SerializableLocalAvgAggregateDescriptor.java
index 9b5e5e9..57d881e 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/serializable/std/SerializableLocalAvgAggregateDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/serializable/std/SerializableLocalAvgAggregateDescriptor.java
@@ -34,8 +34,8 @@
 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.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.algebricks.runtime.base.ISerializableAggregateFunction;
 import edu.uci.ics.hyracks.algebricks.runtime.base.ISerializableAggregateFunctionFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
@@ -60,9 +60,9 @@
     }
 
     @Override
-    public ISerializableAggregateFunctionFactory createAggregateFunctionFactory(IEvaluatorFactory[] args)
+    public ISerializableAggregateFunctionFactory createAggregateFunctionFactory(ICopyEvaluatorFactory[] args)
             throws AlgebricksException {
-        final IEvaluatorFactory[] evals = args;
+        final ICopyEvaluatorFactory[] evals = args;
         List<IAType> unionList = new ArrayList<IAType>();
         unionList.add(BuiltinType.ANULL);
         unionList.add(BuiltinType.ADOUBLE);
@@ -75,7 +75,7 @@
             public ISerializableAggregateFunction createAggregateFunction() throws AlgebricksException {
                 return new ISerializableAggregateFunction() {
                     private ArrayBackedValueStorage inputVal = new ArrayBackedValueStorage();
-                    private IEvaluator eval = evals[0].createEvaluator(inputVal);
+                    private ICopyEvaluator eval = evals[0].createEvaluator(inputVal);
                     private ClosedRecordConstructorEval recordEval;
 
                     private AMutableDouble aDouble = new AMutableDouble(0);
@@ -96,8 +96,8 @@
                     private DataOutput sumBytesOutput = new DataOutputStream(sumBytes);
                     private ByteArrayAccessibleOutputStream countBytes = new ByteArrayAccessibleOutputStream();
                     private DataOutput countBytesOutput = new DataOutputStream(countBytes);
-                    private IEvaluator evalSum = new AccessibleByteArrayEval(avgBytes.getDataOutput(), sumBytes);
-                    private IEvaluator evalCount = new AccessibleByteArrayEval(avgBytes.getDataOutput(), countBytes);
+                    private ICopyEvaluator evalSum = new AccessibleByteArrayEval(avgBytes.getDataOutput(), sumBytes);
+                    private ICopyEvaluator evalCount = new AccessibleByteArrayEval(avgBytes.getDataOutput(), countBytes);
 
                     @Override
                     public void init(DataOutput state) throws AlgebricksException {
@@ -176,7 +176,7 @@
                         boolean metNull = BufferSerDeUtil.getBoolean(state, start + 16);
                         if (recordEval == null)
                             recordEval = new ClosedRecordConstructorEval(recType,
-                                    new IEvaluator[] { evalSum, evalCount }, avgBytes, result);
+                                    new ICopyEvaluator[] { evalSum, evalCount }, avgBytes, result);
                         if (count == 0) {
                             if (GlobalConfig.DEBUG) {
                                 GlobalConfig.ASTERIX_LOGGER.finest("AVG aggregate ran over empty input.");
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/serializable/std/SerializableSumAggregateDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/serializable/std/SerializableSumAggregateDescriptor.java
index 4764cdb..3869227 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/serializable/std/SerializableSumAggregateDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/serializable/std/SerializableSumAggregateDescriptor.java
@@ -28,8 +28,8 @@
 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.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.algebricks.runtime.base.ISerializableAggregateFunction;
 import edu.uci.ics.hyracks.algebricks.runtime.base.ISerializableAggregateFunctionFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
@@ -53,7 +53,7 @@
     }
 
     @Override
-    public ISerializableAggregateFunctionFactory createAggregateFunctionFactory(final IEvaluatorFactory[] args)
+    public ISerializableAggregateFunctionFactory createAggregateFunctionFactory(final ICopyEvaluatorFactory[] args)
             throws AlgebricksException {
         return new ISerializableAggregateFunctionFactory() {
             private static final long serialVersionUID = 1L;
@@ -64,7 +64,7 @@
                 return new ISerializableAggregateFunction() {
 
                     private ArrayBackedValueStorage inputVal = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(inputVal);
+                    private ICopyEvaluator eval = args[0].createEvaluator(inputVal);
                     private AMutableDouble aDouble = new AMutableDouble(0);
                     private AMutableFloat aFloat = new AMutableFloat(0);
                     private AMutableInt64 aInt64 = new AMutableInt64(0);
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/std/AvgAggregateDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/std/AvgAggregateDescriptor.java
index f5c9816..3b3d00b 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/std/AvgAggregateDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/std/AvgAggregateDescriptor.java
@@ -36,8 +36,8 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
 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.base.IEvaluator;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.comm.io.ByteArrayAccessibleOutputStream;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
@@ -61,7 +61,7 @@
     }
 
     @Override
-    public IAggregateFunctionFactory createAggregateFunctionFactory(final IEvaluatorFactory[] args)
+    public IAggregateFunctionFactory createAggregateFunctionFactory(final ICopyEvaluatorFactory[] args)
             throws AlgebricksException {
         List<IAType> unionList = new ArrayList<IAType>();
         unionList.add(BuiltinType.ANULL);
@@ -80,7 +80,7 @@
 
                     private DataOutput out = provider.getDataOutput();
                     private ArrayBackedValueStorage inputVal = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(inputVal);
+                    private ICopyEvaluator eval = args[0].createEvaluator(inputVal);
                     private double sum;
                     private int count;
                     private AMutableDouble aDouble = new AMutableDouble(0);
@@ -91,10 +91,10 @@
                     private DataOutput sumBytesOutput = new DataOutputStream(sumBytes);
                     private ByteArrayAccessibleOutputStream countBytes = new ByteArrayAccessibleOutputStream();
                     private DataOutput countBytesOutput = new DataOutputStream(countBytes);
-                    private IEvaluator evalSum = new AccessibleByteArrayEval(avgBytes.getDataOutput(), sumBytes);
-                    private IEvaluator evalCount = new AccessibleByteArrayEval(avgBytes.getDataOutput(), countBytes);
+                    private ICopyEvaluator evalSum = new AccessibleByteArrayEval(avgBytes.getDataOutput(), sumBytes);
+                    private ICopyEvaluator evalCount = new AccessibleByteArrayEval(avgBytes.getDataOutput(), countBytes);
                     private ClosedRecordConstructorEval recordEval = new ClosedRecordConstructorEval(recType,
-                            new IEvaluator[] { evalSum, evalCount }, avgBytes, out);
+                            new ICopyEvaluator[] { evalSum, evalCount }, avgBytes, out);
 
                     @SuppressWarnings("unchecked")
                     private ISerializerDeserializer<ADouble> doubleSerde = AqlSerializerDeserializerProvider.INSTANCE
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/std/CountAggregateDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/std/CountAggregateDescriptor.java
index 99c845a..6f7eab5 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/std/CountAggregateDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/std/CountAggregateDescriptor.java
@@ -15,7 +15,7 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
 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.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
@@ -40,7 +40,7 @@
     }
 
     @Override
-    public IAggregateFunctionFactory createAggregateFunctionFactory(final IEvaluatorFactory[] args)
+    public IAggregateFunctionFactory createAggregateFunctionFactory(final ICopyEvaluatorFactory[] args)
             throws AlgebricksException {
         return new IAggregateFunctionFactory() {
 
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/std/GlobalAvgAggregateDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/std/GlobalAvgAggregateDescriptor.java
index 530f790..0c869dc 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/std/GlobalAvgAggregateDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/std/GlobalAvgAggregateDescriptor.java
@@ -32,8 +32,8 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
 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.base.IEvaluator;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.comm.io.ByteArrayAccessibleOutputStream;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
@@ -59,7 +59,7 @@
     }
 
     @Override
-    public IAggregateFunctionFactory createAggregateFunctionFactory(final IEvaluatorFactory[] args)
+    public IAggregateFunctionFactory createAggregateFunctionFactory(final ICopyEvaluatorFactory[] args)
             throws AlgebricksException {
         List<IAType> unionList = new ArrayList<IAType>();
         unionList.add(BuiltinType.ANULL);
@@ -78,7 +78,7 @@
 
                     private DataOutput out = provider.getDataOutput();
                     private ArrayBackedValueStorage inputVal = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(inputVal);
+                    private ICopyEvaluator eval = args[0].createEvaluator(inputVal);
                     private double globalSum;
                     private int globalCount;
                     private AMutableDouble aDouble = new AMutableDouble(0);
@@ -89,10 +89,10 @@
                     private DataOutput sumBytesOutput = new DataOutputStream(sumBytes);
                     private ByteArrayAccessibleOutputStream countBytes = new ByteArrayAccessibleOutputStream();
                     private DataOutput countBytesOutput = new DataOutputStream(countBytes);
-                    private IEvaluator evalSum = new AccessibleByteArrayEval(avgBytes.getDataOutput(), sumBytes);
-                    private IEvaluator evalCount = new AccessibleByteArrayEval(avgBytes.getDataOutput(), countBytes);
+                    private ICopyEvaluator evalSum = new AccessibleByteArrayEval(avgBytes.getDataOutput(), sumBytes);
+                    private ICopyEvaluator evalCount = new AccessibleByteArrayEval(avgBytes.getDataOutput(), countBytes);
                     private ClosedRecordConstructorEval recordEval = new ClosedRecordConstructorEval(recType,
-                            new IEvaluator[] { evalSum, evalCount }, avgBytes, out);
+                            new ICopyEvaluator[] { evalSum, evalCount }, avgBytes, out);
 
                     @SuppressWarnings("unchecked")
                     private ISerializerDeserializer<AInt32> intSerde = AqlSerializerDeserializerProvider.INSTANCE
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/std/LocalAvgAggregateDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/std/LocalAvgAggregateDescriptor.java
index 5523b0d..34f495b 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/std/LocalAvgAggregateDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/std/LocalAvgAggregateDescriptor.java
@@ -36,8 +36,8 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
 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.base.IEvaluator;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.comm.io.ByteArrayAccessibleOutputStream;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
@@ -61,7 +61,7 @@
     }
 
     @Override
-    public IAggregateFunctionFactory createAggregateFunctionFactory(final IEvaluatorFactory[] args)
+    public IAggregateFunctionFactory createAggregateFunctionFactory(final ICopyEvaluatorFactory[] args)
             throws AlgebricksException {
 
         return new IAggregateFunctionFactory() {
@@ -81,7 +81,7 @@
 
                     private DataOutput out = provider.getDataOutput();
                     private ArrayBackedValueStorage inputVal = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(inputVal);
+                    private ICopyEvaluator eval = args[0].createEvaluator(inputVal);
                     private double sum;
                     private int count;
 
@@ -90,10 +90,10 @@
                     private DataOutput sumBytesOutput = new DataOutputStream(sumBytes);
                     private ByteArrayAccessibleOutputStream countBytes = new ByteArrayAccessibleOutputStream();
                     private DataOutput countBytesOutput = new DataOutputStream(countBytes);
-                    private IEvaluator evalSum = new AccessibleByteArrayEval(avgBytes.getDataOutput(), sumBytes);
-                    private IEvaluator evalCount = new AccessibleByteArrayEval(avgBytes.getDataOutput(), countBytes);
+                    private ICopyEvaluator evalSum = new AccessibleByteArrayEval(avgBytes.getDataOutput(), sumBytes);
+                    private ICopyEvaluator evalCount = new AccessibleByteArrayEval(avgBytes.getDataOutput(), countBytes);
                     private ClosedRecordConstructorEval recordEval = new ClosedRecordConstructorEval(recType,
-                            new IEvaluator[] { evalSum, evalCount }, avgBytes, out);
+                            new ICopyEvaluator[] { evalSum, evalCount }, avgBytes, out);
                     @SuppressWarnings("unchecked")
                     private ISerializerDeserializer<ADouble> doubleSerde = AqlSerializerDeserializerProvider.INSTANCE
                             .getSerializerDeserializer(BuiltinType.ADOUBLE);
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/std/MaxAggregateDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/std/MaxAggregateDescriptor.java
index 43a8cb1..4e256b3 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/std/MaxAggregateDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/std/MaxAggregateDescriptor.java
@@ -28,8 +28,8 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
 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.base.IEvaluator;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -53,7 +53,7 @@
 
     @SuppressWarnings("unchecked")
     @Override
-    public IAggregateFunctionFactory createAggregateFunctionFactory(final IEvaluatorFactory[] args)
+    public IAggregateFunctionFactory createAggregateFunctionFactory(final ICopyEvaluatorFactory[] args)
             throws AlgebricksException {
         return new IAggregateFunctionFactory() {
             private static final long serialVersionUID = 1L;
@@ -66,7 +66,7 @@
 
                     private DataOutput out = provider.getDataOutput();
                     private ArrayBackedValueStorage inputVal = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(inputVal);
+                    private ICopyEvaluator eval = args[0].createEvaluator(inputVal);
                     private boolean metInt8s, metInt16s, metInt32s, metInt64s, metFloats, metDoubles, metNull;
 
                     private short shortVal = Short.MIN_VALUE;
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/std/MinAggregateDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/std/MinAggregateDescriptor.java
index 8654076..a7a8dec 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/std/MinAggregateDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/std/MinAggregateDescriptor.java
@@ -28,8 +28,8 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
 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.base.IEvaluator;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -53,7 +53,7 @@
 
     @SuppressWarnings("unchecked")
     @Override
-    public IAggregateFunctionFactory createAggregateFunctionFactory(final IEvaluatorFactory[] args)
+    public IAggregateFunctionFactory createAggregateFunctionFactory(final ICopyEvaluatorFactory[] args)
             throws AlgebricksException {
         return new IAggregateFunctionFactory() {
             private static final long serialVersionUID = 1L;
@@ -66,7 +66,7 @@
 
                     private DataOutput out = provider.getDataOutput();
                     private ArrayBackedValueStorage inputVal = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(inputVal);
+                    private ICopyEvaluator eval = args[0].createEvaluator(inputVal);
                     private boolean metInt8s, metInt16s, metInt32s, metInt64s, metFloats, metDoubles, metNull;
 
                     private short shortVal = Short.MAX_VALUE;
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/std/SumAggregateDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/std/SumAggregateDescriptor.java
index 129d0b7..c0ce10f 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/std/SumAggregateDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/std/SumAggregateDescriptor.java
@@ -30,8 +30,8 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
 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.base.IEvaluator;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -55,7 +55,7 @@
 
     @SuppressWarnings("unchecked")
     @Override
-    public IAggregateFunctionFactory createAggregateFunctionFactory(final IEvaluatorFactory[] args)
+    public IAggregateFunctionFactory createAggregateFunctionFactory(final ICopyEvaluatorFactory[] args)
             throws AlgebricksException {
         return new IAggregateFunctionFactory() {
             private static final long serialVersionUID = 1L;
@@ -68,7 +68,7 @@
 
                     private DataOutput out = provider.getDataOutput();
                     private ArrayBackedValueStorage inputVal = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(inputVal);
+                    private ICopyEvaluator eval = args[0].createEvaluator(inputVal);
                     private boolean metInt8s, metInt16s, metInt32s, metInt64s, metFloats, metDoubles, metNull;
                     private double sum;
                     private AMutableDouble aDouble = new AMutableDouble(0);
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/stream/NonEmptyStreamAggregateDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/stream/NonEmptyStreamAggregateDescriptor.java
index 3afc3c0..dfd168e 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/stream/NonEmptyStreamAggregateDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/aggregates/stream/NonEmptyStreamAggregateDescriptor.java
@@ -13,7 +13,7 @@
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
 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.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -32,7 +32,7 @@
     };
 
     @Override
-    public IAggregateFunctionFactory createAggregateFunctionFactory(IEvaluatorFactory[] args)
+    public IAggregateFunctionFactory createAggregateFunctionFactory(ICopyEvaluatorFactory[] args)
             throws AlgebricksException {
         return new IAggregateFunctionFactory() {
 
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/base/AsterixTupleFilter.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/base/AsterixTupleFilter.java
index 3ef8cf3..225377e 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/base/AsterixTupleFilter.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/base/AsterixTupleFilter.java
@@ -17,8 +17,8 @@
 
 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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
 import edu.uci.ics.hyracks.storage.am.common.api.ITupleFilter;
@@ -26,10 +26,10 @@
 public class AsterixTupleFilter implements ITupleFilter {
 	
 	private final IBinaryBooleanInspector boolInspector;
-	private final IEvaluator eval;
+	private final ICopyEvaluator eval;
     private final ArrayBackedValueStorage evalOut = new ArrayBackedValueStorage();
     
-	public AsterixTupleFilter(IEvaluatorFactory evalFactory,
+	public AsterixTupleFilter(ICopyEvaluatorFactory evalFactory,
 			IBinaryBooleanInspector boolInspector) throws AlgebricksException {
 		this.boolInspector = boolInspector;
 		eval = evalFactory.createEvaluator(evalOut);
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/base/AsterixTupleFilterFactory.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/base/AsterixTupleFilterFactory.java
index ce5cefd..2f4e71b 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/base/AsterixTupleFilterFactory.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/base/AsterixTupleFilterFactory.java
@@ -17,7 +17,7 @@
 
 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.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.storage.am.common.api.ITupleFilter;
 import edu.uci.ics.hyracks.storage.am.common.api.ITupleFilterFactory;
 
@@ -26,9 +26,9 @@
     private static final long serialVersionUID = 1L;
     
     private final IBinaryBooleanInspector boolInspector;
-    private final IEvaluatorFactory evalFactory;
+    private final ICopyEvaluatorFactory evalFactory;
     
-    public AsterixTupleFilterFactory(IEvaluatorFactory evalFactory,
+    public AsterixTupleFilterFactory(ICopyEvaluatorFactory evalFactory,
             IBinaryBooleanInspector boolInspector) throws AlgebricksException {
         this.evalFactory = evalFactory;
         this.boolInspector = boolInspector;
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/base/IAggregateFunctionDynamicDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/base/IAggregateFunctionDynamicDescriptor.java
index bb87e723..db7fc62 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/base/IAggregateFunctionDynamicDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/base/IAggregateFunctionDynamicDescriptor.java
@@ -3,9 +3,9 @@
 import edu.uci.ics.asterix.om.functions.IFunctionDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 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.ICopyEvaluatorFactory;
 
 public interface IAggregateFunctionDynamicDescriptor extends IFunctionDescriptor {
-    public IAggregateFunctionFactory createAggregateFunctionFactory(final IEvaluatorFactory[] args)
+    public IAggregateFunctionFactory createAggregateFunctionFactory(final ICopyEvaluatorFactory[] args)
             throws AlgebricksException;
 }
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/base/IRunningAggregateFunctionDynamicDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/base/IRunningAggregateFunctionDynamicDescriptor.java
index 58fae4b..1a19aa6 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/base/IRunningAggregateFunctionDynamicDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/base/IRunningAggregateFunctionDynamicDescriptor.java
@@ -3,10 +3,10 @@
 
 import edu.uci.ics.asterix.om.functions.IFunctionDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.algebricks.runtime.base.IRunningAggregateFunctionFactory;
 
 public interface IRunningAggregateFunctionDynamicDescriptor extends IFunctionDescriptor {
-    public IRunningAggregateFunctionFactory createRunningAggregateFunctionFactory(final IEvaluatorFactory[] args)
+    public IRunningAggregateFunctionFactory createRunningAggregateFunctionFactory(final ICopyEvaluatorFactory[] args)
             throws AlgebricksException;
 }
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/base/IScalarFunctionDynamicDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/base/IScalarFunctionDynamicDescriptor.java
index 5c9a6bd..8e4353e 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/base/IScalarFunctionDynamicDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/base/IScalarFunctionDynamicDescriptor.java
@@ -3,8 +3,8 @@
 
 import edu.uci.ics.asterix.om.functions.IFunctionDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 
 public interface IScalarFunctionDynamicDescriptor extends IFunctionDescriptor {
-    public IEvaluatorFactory createEvaluatorFactory(IEvaluatorFactory[] args) throws AlgebricksException;
+    public ICopyEvaluatorFactory createEvaluatorFactory(ICopyEvaluatorFactory[] args) throws AlgebricksException;
 }
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/base/ISerializableAggregateFunctionDynamicDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/base/ISerializableAggregateFunctionDynamicDescriptor.java
index 7250ef4..fbd17a9 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/base/ISerializableAggregateFunctionDynamicDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/base/ISerializableAggregateFunctionDynamicDescriptor.java
@@ -2,10 +2,10 @@
 
 import edu.uci.ics.asterix.om.functions.IFunctionDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.algebricks.runtime.base.ISerializableAggregateFunctionFactory;
 
 public interface ISerializableAggregateFunctionDynamicDescriptor extends IFunctionDescriptor {
-    public ISerializableAggregateFunctionFactory createAggregateFunctionFactory(final IEvaluatorFactory[] args)
+    public ISerializableAggregateFunctionFactory createAggregateFunctionFactory(final ICopyEvaluatorFactory[] args)
             throws AlgebricksException;
 }
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/base/IUnnestingFunctionDynamicDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/base/IUnnestingFunctionDynamicDescriptor.java
index 959b025..30188f7 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/base/IUnnestingFunctionDynamicDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/base/IUnnestingFunctionDynamicDescriptor.java
@@ -2,10 +2,10 @@
 
 import edu.uci.ics.asterix.om.functions.IFunctionDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.algebricks.runtime.base.IUnnestingFunctionFactory;
 
 public interface IUnnestingFunctionDynamicDescriptor extends IFunctionDescriptor {
-    public IUnnestingFunctionFactory createUnnestingFunctionFactory(final IEvaluatorFactory[] args)
+    public IUnnestingFunctionFactory createUnnestingFunctionFactory(final ICopyEvaluatorFactory[] args)
             throws AlgebricksException;
 }
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/AccessibleByteArrayEval.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/AccessibleByteArrayEval.java
index 8e69515..deb40eb 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/AccessibleByteArrayEval.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/AccessibleByteArrayEval.java
@@ -5,11 +5,11 @@
 import java.io.IOException;
 
 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.ICopyEvaluator;
 import edu.uci.ics.hyracks.dataflow.common.comm.io.ByteArrayAccessibleOutputStream;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
 
-public class AccessibleByteArrayEval implements IEvaluator {
+public class AccessibleByteArrayEval implements ICopyEvaluator {
 
     private DataOutput out;
     private ByteArrayAccessibleOutputStream baaos;
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/ClosedRecordConstructorEvalFactory.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/ClosedRecordConstructorEvalFactory.java
index 2c14bd0..069b8a3 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/ClosedRecordConstructorEvalFactory.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/ClosedRecordConstructorEvalFactory.java
@@ -8,28 +8,28 @@
 import edu.uci.ics.asterix.om.types.ARecordType;
 import edu.uci.ics.asterix.om.types.ATypeTag;
 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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 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;
 
-public class ClosedRecordConstructorEvalFactory implements IEvaluatorFactory {
+public class ClosedRecordConstructorEvalFactory implements ICopyEvaluatorFactory {
 
     private static final long serialVersionUID = 1L;
 
-    private IEvaluatorFactory[] args;
+    private ICopyEvaluatorFactory[] args;
     private ARecordType recType;
 
-    public ClosedRecordConstructorEvalFactory(IEvaluatorFactory[] args, ARecordType recType) {
+    public ClosedRecordConstructorEvalFactory(ICopyEvaluatorFactory[] args, ARecordType recType) {
         this.args = args;
         this.recType = recType;
     }
 
     @Override
-    public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+    public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
         int n = args.length / 2;
-        IEvaluator[] evalFields = new IEvaluator[n];
+        ICopyEvaluator[] evalFields = new ICopyEvaluator[n];
         ArrayBackedValueStorage fieldValueBuffer = new ArrayBackedValueStorage();
         for (int i = 0; i < n; i++) {
             evalFields[i] = args[2 * i + 1].createEvaluator(fieldValueBuffer);
@@ -38,9 +38,9 @@
         return new ClosedRecordConstructorEval(recType, evalFields, fieldValueBuffer, out);
     }
 
-    public static class ClosedRecordConstructorEval implements IEvaluator {
+    public static class ClosedRecordConstructorEval implements ICopyEvaluator {
 
-        private IEvaluator[] evalFields;
+        private ICopyEvaluator[] evalFields;
         private DataOutput out;
         private IARecordBuilder recBuilder = new RecordBuilder();
         private ARecordType recType;
@@ -48,7 +48,7 @@
         private final static byte SER_NULL_TYPE_TAG = ATypeTag.NULL.serialize();
         private boolean first = true;
 
-        public ClosedRecordConstructorEval(ARecordType recType, IEvaluator[] evalFields,
+        public ClosedRecordConstructorEval(ARecordType recType, ICopyEvaluator[] evalFields,
                 ArrayBackedValueStorage fieldValueBuffer, DataOutput out) {
             this.evalFields = evalFields;
             this.fieldValueBuffer = fieldValueBuffer;
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/CreateMBREvalFactory.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/CreateMBREvalFactory.java
index 165cd56..ed7b9bb 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/CreateMBREvalFactory.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/CreateMBREvalFactory.java
@@ -16,31 +16,31 @@
 import edu.uci.ics.asterix.om.types.EnumDeserializer;
 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.IEvaluator;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 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;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
 
-public class CreateMBREvalFactory implements IEvaluatorFactory {
+public class CreateMBREvalFactory implements ICopyEvaluatorFactory {
 
     private static final long serialVersionUID = 1L;
 
-    private IEvaluatorFactory recordEvalFactory;
-    private IEvaluatorFactory dimensionEvalFactory;
-    private IEvaluatorFactory coordinateEvalFactory;
+    private ICopyEvaluatorFactory recordEvalFactory;
+    private ICopyEvaluatorFactory dimensionEvalFactory;
+    private ICopyEvaluatorFactory coordinateEvalFactory;
 
-    public CreateMBREvalFactory(IEvaluatorFactory recordEvalFactory, IEvaluatorFactory dimensionEvalFactory,
-            IEvaluatorFactory coordinateEvalFactory) {
+    public CreateMBREvalFactory(ICopyEvaluatorFactory recordEvalFactory, ICopyEvaluatorFactory dimensionEvalFactory,
+            ICopyEvaluatorFactory coordinateEvalFactory) {
         this.recordEvalFactory = recordEvalFactory;
         this.dimensionEvalFactory = dimensionEvalFactory;
         this.coordinateEvalFactory = coordinateEvalFactory;
     }
 
     @Override
-    public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-        return new IEvaluator() {
+    public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+        return new ICopyEvaluator() {
 
             private DataOutput out = output.getDataOutput();
 
@@ -48,9 +48,9 @@
             private ArrayBackedValueStorage outInput1 = new ArrayBackedValueStorage();
             private ArrayBackedValueStorage outInput2 = new ArrayBackedValueStorage();
 
-            private IEvaluator eval0 = recordEvalFactory.createEvaluator(outInput0);
-            private IEvaluator eval1 = dimensionEvalFactory.createEvaluator(outInput1);
-            private IEvaluator eval2 = coordinateEvalFactory.createEvaluator(outInput2);
+            private ICopyEvaluator eval0 = recordEvalFactory.createEvaluator(outInput0);
+            private ICopyEvaluator eval1 = dimensionEvalFactory.createEvaluator(outInput1);
+            private ICopyEvaluator eval2 = coordinateEvalFactory.createEvaluator(outInput2);
 
             @Override
             public void evaluate(IFrameTupleReference tuple) throws AlgebricksException {
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/EditDistanceEvaluator.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/EditDistanceEvaluator.java
index 57331db..613417d 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/EditDistanceEvaluator.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/EditDistanceEvaluator.java
@@ -11,22 +11,22 @@
 import edu.uci.ics.asterix.om.types.EnumDeserializer;
 import edu.uci.ics.fuzzyjoin.similarity.SimilarityMetricEditDistance;
 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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 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;
 
-public class EditDistanceEvaluator implements IEvaluator {
+public class EditDistanceEvaluator implements ICopyEvaluator {
 
     // assuming type indicator in serde format
     protected final int typeIndicatorSize = 1;
 
     protected final DataOutput out;
     protected final ArrayBackedValueStorage argOut = new ArrayBackedValueStorage();
-    protected final IEvaluator firstStringEval;
-    protected final IEvaluator secondStringEval;
+    protected final ICopyEvaluator firstStringEval;
+    protected final ICopyEvaluator secondStringEval;
     protected final SimilarityMetricEditDistance ed = new SimilarityMetricEditDistance();
     protected final AsterixOrderedListIterator firstOrdListIter = new AsterixOrderedListIterator();
     protected final AsterixOrderedListIterator secondOrdListIter = new AsterixOrderedListIterator();
@@ -42,7 +42,7 @@
     protected ATypeTag firstTypeTag;
     protected ATypeTag secondTypeTag;
 
-    public EditDistanceEvaluator(IEvaluatorFactory[] args, IDataOutputProvider output) throws AlgebricksException {
+    public EditDistanceEvaluator(ICopyEvaluatorFactory[] args, IDataOutputProvider output) throws AlgebricksException {
         out = output.getDataOutput();
         firstStringEval = args[0].createEvaluator(argOut);
         secondStringEval = args[1].createEvaluator(argOut);
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/FieldAccessByIndexEvalFactory.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/FieldAccessByIndexEvalFactory.java
index 49a1d99..604bb68 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/FieldAccessByIndexEvalFactory.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/FieldAccessByIndexEvalFactory.java
@@ -16,26 +16,26 @@
 import edu.uci.ics.asterix.om.util.NonTaggedFormatUtil;
 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.IEvaluator;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 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;
 import edu.uci.ics.hyracks.dataflow.common.data.marshalling.IntegerSerializerDeserializer;
 
-public class FieldAccessByIndexEvalFactory implements IEvaluatorFactory {
+public class FieldAccessByIndexEvalFactory implements ICopyEvaluatorFactory {
 
     private static final long serialVersionUID = 1L;
 
-    private IEvaluatorFactory recordEvalFactory;
-    private IEvaluatorFactory fieldIndexEvalFactory;
+    private ICopyEvaluatorFactory recordEvalFactory;
+    private ICopyEvaluatorFactory fieldIndexEvalFactory;
     private int nullBitmapSize;
     private ARecordType recordType;
     private final static byte SER_NULL_TYPE_TAG = ATypeTag.NULL.serialize();
     private final static byte SER_RECORD_TYPE_TAG = ATypeTag.RECORD.serialize();
 
-    public FieldAccessByIndexEvalFactory(IEvaluatorFactory recordEvalFactory, IEvaluatorFactory fieldIndexEvalFactory,
+    public FieldAccessByIndexEvalFactory(ICopyEvaluatorFactory recordEvalFactory, ICopyEvaluatorFactory fieldIndexEvalFactory,
             ARecordType recordType) {
         this.recordEvalFactory = recordEvalFactory;
         this.fieldIndexEvalFactory = fieldIndexEvalFactory;
@@ -48,15 +48,15 @@
     }
 
     @Override
-    public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-        return new IEvaluator() {
+    public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+        return new ICopyEvaluator() {
 
             private DataOutput out = output.getDataOutput();
 
             private ArrayBackedValueStorage outInput0 = new ArrayBackedValueStorage();
             private ArrayBackedValueStorage outInput1 = new ArrayBackedValueStorage();
-            private IEvaluator eval0 = recordEvalFactory.createEvaluator(outInput0);
-            private IEvaluator eval1 = fieldIndexEvalFactory.createEvaluator(outInput1);
+            private ICopyEvaluator eval0 = recordEvalFactory.createEvaluator(outInput0);
+            private ICopyEvaluator eval1 = fieldIndexEvalFactory.createEvaluator(outInput1);
             @SuppressWarnings("unchecked")
             private ISerializerDeserializer<ANull> nullSerde = AqlSerializerDeserializerProvider.INSTANCE
                     .getSerializerDeserializer(BuiltinType.ANULL);
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/GramTokensEvaluator.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/GramTokensEvaluator.java
index 4b392bd..606b47f 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/GramTokensEvaluator.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/GramTokensEvaluator.java
@@ -12,24 +12,24 @@
 import edu.uci.ics.fuzzyjoin.tokenizer.IToken;
 import edu.uci.ics.fuzzyjoin.tokenizer.NGramUTF8StringBinaryTokenizer;
 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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 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;
 import edu.uci.ics.hyracks.dataflow.common.data.marshalling.BooleanSerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.marshalling.IntegerSerializerDeserializer;
 
-public class GramTokensEvaluator implements IEvaluator {
+public class GramTokensEvaluator implements ICopyEvaluator {
 
     // assuming type indicator in serde format
     private final int typeIndicatorSize = 1;
 
     protected final DataOutput out;
     protected final ArrayBackedValueStorage argOut = new ArrayBackedValueStorage();
-    protected final IEvaluator stringEval;
-    protected final IEvaluator gramLengthEval;
-    protected final IEvaluator prePostEval;
+    protected final ICopyEvaluator stringEval;
+    protected final ICopyEvaluator gramLengthEval;
+    protected final ICopyEvaluator prePostEval;
 
     private final NGramUTF8StringBinaryTokenizer tokenizer;
 
@@ -40,7 +40,7 @@
     private ArrayBackedValueStorage inputVal = new ArrayBackedValueStorage();
     private BuiltinType itemType;
 
-    public GramTokensEvaluator(IEvaluatorFactory[] args, IDataOutputProvider output, IBinaryTokenizer tokenizer,
+    public GramTokensEvaluator(ICopyEvaluatorFactory[] args, IDataOutputProvider output, IBinaryTokenizer tokenizer,
             BuiltinType itemType) throws AlgebricksException {
         out = output.getDataOutput();
         stringEval = args[0].createEvaluator(argOut);
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/SimilarityJaccardEvaluator.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/SimilarityJaccardEvaluator.java
index 0c0c36d..a73cc72 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/SimilarityJaccardEvaluator.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/SimilarityJaccardEvaluator.java
@@ -11,8 +11,8 @@
 import edu.uci.ics.asterix.om.types.EnumDeserializer;
 import edu.uci.ics.fuzzyjoin.similarity.SimilarityMetricJaccard;
 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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -20,15 +20,15 @@
 
 // assumes that both arguments are sorted by the same ordering
 
-public class SimilarityJaccardEvaluator implements IEvaluator {
+public class SimilarityJaccardEvaluator implements ICopyEvaluator {
 
     // assuming type indicator in serde format
     protected final int typeIndicatorSize = 1;
 
     protected final DataOutput out;
     protected final ArrayBackedValueStorage argOut = new ArrayBackedValueStorage();
-    protected final IEvaluator firstOrdListEval;
-    protected final IEvaluator secondOrdListEval;
+    protected final ICopyEvaluator firstOrdListEval;
+    protected final ICopyEvaluator secondOrdListEval;
 
     protected final AsterixOrderedListIterator fstOrdListIter = new AsterixOrderedListIterator();
     protected final AsterixOrderedListIterator sndOrdListIter = new AsterixOrderedListIterator();
@@ -52,7 +52,7 @@
     protected int secondStart = -1;
     protected float jaccSim = 0.0f;
 
-    public SimilarityJaccardEvaluator(IEvaluatorFactory[] args, IDataOutputProvider output) throws AlgebricksException {
+    public SimilarityJaccardEvaluator(ICopyEvaluatorFactory[] args, IDataOutputProvider output) throws AlgebricksException {
         out = output.getDataOutput();
         firstOrdListEval = args[0].createEvaluator(argOut);
         secondOrdListEval = args[1].createEvaluator(argOut);
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/SimilarityJaccardPrefixEvaluator.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/SimilarityJaccardPrefixEvaluator.java
index 8961257..3b527d9 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/SimilarityJaccardPrefixEvaluator.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/SimilarityJaccardPrefixEvaluator.java
@@ -18,26 +18,26 @@
 import edu.uci.ics.fuzzyjoin.similarity.SimilarityFiltersJaccard;
 import edu.uci.ics.fuzzyjoin.similarity.SimilarityMetric;
 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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 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;
 import edu.uci.ics.hyracks.dataflow.common.data.marshalling.IntegerSerializerDeserializer;
 
-public class SimilarityJaccardPrefixEvaluator implements IEvaluator {
+public class SimilarityJaccardPrefixEvaluator implements ICopyEvaluator {
     // assuming type indicator in serde format
     protected final int typeIndicatorSize = 1;
 
     protected final DataOutput out;
     protected final ArrayBackedValueStorage inputVal = new ArrayBackedValueStorage();
-    protected final IEvaluator evalLen1;
-    protected final IEvaluator evalTokens1;
-    protected final IEvaluator evalLen2;
-    protected final IEvaluator evalTokens2;
-    protected final IEvaluator evalTokenPrefix;
-    protected final IEvaluator evalThreshold;
+    protected final ICopyEvaluator evalLen1;
+    protected final ICopyEvaluator evalTokens1;
+    protected final ICopyEvaluator evalLen2;
+    protected final ICopyEvaluator evalTokens2;
+    protected final ICopyEvaluator evalTokenPrefix;
+    protected final ICopyEvaluator evalThreshold;
 
     protected float similarityThresholdCache;
     protected SimilarityFiltersJaccard similarityFilters;
@@ -57,7 +57,7 @@
     protected final ISerializerDeserializer<AFloat> reusSerde = AqlSerializerDeserializerProvider.INSTANCE
             .getSerializerDeserializer(BuiltinType.AFLOAT);
 
-    public SimilarityJaccardPrefixEvaluator(IEvaluatorFactory[] args, IDataOutputProvider output)
+    public SimilarityJaccardPrefixEvaluator(ICopyEvaluatorFactory[] args, IDataOutputProvider output)
             throws AlgebricksException {
         out = output.getDataOutput();
         evalLen1 = args[0].createEvaluator(inputVal);
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/WordTokensEvaluator.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/WordTokensEvaluator.java
index d9fde50..377a116 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/WordTokensEvaluator.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/WordTokensEvaluator.java
@@ -11,16 +11,16 @@
 import edu.uci.ics.fuzzyjoin.tokenizer.IBinaryTokenizer;
 import edu.uci.ics.fuzzyjoin.tokenizer.IToken;
 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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 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;
 
-public class WordTokensEvaluator implements IEvaluator {
+public class WordTokensEvaluator implements ICopyEvaluator {
     protected final DataOutput out;
     protected final ArrayBackedValueStorage argOut = new ArrayBackedValueStorage();
-    protected final IEvaluator stringEval;
+    protected final ICopyEvaluator stringEval;
 
     protected final IBinaryTokenizer tokenizer;
 
@@ -31,7 +31,7 @@
     private ArrayBackedValueStorage inputVal = new ArrayBackedValueStorage();
     private BuiltinType itemType;
 
-    public WordTokensEvaluator(IEvaluatorFactory[] args, IDataOutputProvider output, IBinaryTokenizer tokenizer,
+    public WordTokensEvaluator(ICopyEvaluatorFactory[] args, IDataOutputProvider output, IBinaryTokenizer tokenizer,
             BuiltinType itemType) throws AlgebricksException {
         out = output.getDataOutput();
         stringEval = args[0].createEvaluator(argOut);
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/comparisons/AbstractComparisonEvaluator.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/comparisons/AbstractComparisonEvaluator.java
index 5082c67..6e1cea4 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/comparisons/AbstractComparisonEvaluator.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/comparisons/AbstractComparisonEvaluator.java
@@ -17,8 +17,8 @@
 import edu.uci.ics.asterix.om.types.BuiltinType;
 import edu.uci.ics.asterix.om.types.EnumDeserializer;
 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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparator;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
@@ -26,7 +26,7 @@
 import edu.uci.ics.hyracks.dataflow.common.data.marshalling.FloatSerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.marshalling.IntegerSerializerDeserializer;
 
-public abstract class AbstractComparisonEvaluator implements IEvaluator {
+public abstract class AbstractComparisonEvaluator implements ICopyEvaluator {
 
     protected enum ComparisonResult {
         LESS_THAN,
@@ -38,8 +38,8 @@
     protected DataOutput out;
     protected ArrayBackedValueStorage outLeft = new ArrayBackedValueStorage();
     protected ArrayBackedValueStorage outRight = new ArrayBackedValueStorage();
-    protected IEvaluator evalLeft;
-    protected IEvaluator evalRight;
+    protected ICopyEvaluator evalLeft;
+    protected ICopyEvaluator evalRight;
     @SuppressWarnings("unchecked")
     protected ISerializerDeserializer<ABoolean> serde = AqlSerializerDeserializerProvider.INSTANCE
             .getSerializerDeserializer(BuiltinType.ABOOLEAN);
@@ -51,8 +51,8 @@
     protected IBinaryComparator dateTimeBinaryComp = ADateTimeAscBinaryComparatorFactory.INSTANCE
             .createBinaryComparator();
 
-    public AbstractComparisonEvaluator(DataOutput out, IEvaluatorFactory evalLeftFactory,
-            IEvaluatorFactory evalRightFactory) throws AlgebricksException {
+    public AbstractComparisonEvaluator(DataOutput out, ICopyEvaluatorFactory evalLeftFactory,
+            ICopyEvaluatorFactory evalRightFactory) throws AlgebricksException {
         this.out = out;
         this.evalLeft = evalLeftFactory.createEvaluator(outLeft);
         this.evalRight = evalRightFactory.createEvaluator(outRight);
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/comparisons/ComparisonEvalFactory.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/comparisons/ComparisonEvalFactory.java
index 5f3675c..c971929 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/comparisons/ComparisonEvalFactory.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/comparisons/ComparisonEvalFactory.java
@@ -6,21 +6,21 @@
 import edu.uci.ics.asterix.om.base.ANull;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.AlgebricksBuiltinFunctions.ComparisonKind;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
 
-public class ComparisonEvalFactory implements IEvaluatorFactory {
+public class ComparisonEvalFactory implements ICopyEvaluatorFactory {
 
     private static final long serialVersionUID = 1L;
 
-    private IEvaluatorFactory evalLeftFactory;
-    private IEvaluatorFactory evalRightFactory;
+    private ICopyEvaluatorFactory evalLeftFactory;
+    private ICopyEvaluatorFactory evalRightFactory;
     private ComparisonKind comparisonKind;
 
-    public ComparisonEvalFactory(IEvaluatorFactory evalLeftFactory, IEvaluatorFactory evalRightFactory,
+    public ComparisonEvalFactory(ICopyEvaluatorFactory evalLeftFactory, ICopyEvaluatorFactory evalRightFactory,
             ComparisonKind comparisonKind) {
         this.evalLeftFactory = evalLeftFactory;
         this.evalRightFactory = evalRightFactory;
@@ -28,7 +28,7 @@
     }
 
     @Override
-    public IEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
+    public ICopyEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
         DataOutput out = output.getDataOutput();
         switch (comparisonKind) {
             // Should we do any normalization?
@@ -57,8 +57,8 @@
     }
 
     static class EqualityComparisonEvaluator extends AbstractComparisonEvaluator {
-        public EqualityComparisonEvaluator(DataOutput out, IEvaluatorFactory evalLeftFactory,
-                IEvaluatorFactory evalRightFactory) throws AlgebricksException {
+        public EqualityComparisonEvaluator(DataOutput out, ICopyEvaluatorFactory evalLeftFactory,
+                ICopyEvaluatorFactory evalRightFactory) throws AlgebricksException {
             super(out, evalLeftFactory, evalRightFactory);
         }
 
@@ -85,8 +85,8 @@
     }
 
     static class InequalityComparisonEvaluator extends AbstractComparisonEvaluator {
-        public InequalityComparisonEvaluator(DataOutput out, IEvaluatorFactory evalLeftFactory,
-                IEvaluatorFactory evalRightFactory) throws AlgebricksException {
+        public InequalityComparisonEvaluator(DataOutput out, ICopyEvaluatorFactory evalLeftFactory,
+                ICopyEvaluatorFactory evalRightFactory) throws AlgebricksException {
             super(out, evalLeftFactory, evalRightFactory);
         }
 
@@ -113,8 +113,8 @@
     }
 
     static class GreaterThanOrEqualComparisonEvaluator extends AbstractComparisonEvaluator {
-        public GreaterThanOrEqualComparisonEvaluator(DataOutput out, IEvaluatorFactory evalLeftFactory,
-                IEvaluatorFactory evalRightFactory) throws AlgebricksException {
+        public GreaterThanOrEqualComparisonEvaluator(DataOutput out, ICopyEvaluatorFactory evalLeftFactory,
+                ICopyEvaluatorFactory evalRightFactory) throws AlgebricksException {
             super(out, evalLeftFactory, evalRightFactory);
         }
 
@@ -142,8 +142,8 @@
     }
 
     static class GreaterThanComparisonEvaluator extends AbstractComparisonEvaluator {
-        public GreaterThanComparisonEvaluator(DataOutput out, IEvaluatorFactory evalLeftFactory,
-                IEvaluatorFactory evalRightFactory) throws AlgebricksException {
+        public GreaterThanComparisonEvaluator(DataOutput out, ICopyEvaluatorFactory evalLeftFactory,
+                ICopyEvaluatorFactory evalRightFactory) throws AlgebricksException {
             super(out, evalLeftFactory, evalRightFactory);
         }
 
@@ -170,8 +170,8 @@
     }
 
     static class LessThanOrEqualComparisonEvaluator extends AbstractComparisonEvaluator {
-        public LessThanOrEqualComparisonEvaluator(DataOutput out, IEvaluatorFactory evalLeftFactory,
-                IEvaluatorFactory evalRightFactory) throws AlgebricksException {
+        public LessThanOrEqualComparisonEvaluator(DataOutput out, ICopyEvaluatorFactory evalLeftFactory,
+                ICopyEvaluatorFactory evalRightFactory) throws AlgebricksException {
             super(out, evalLeftFactory, evalRightFactory);
         }
 
@@ -199,8 +199,8 @@
     }
 
     static class LessThanComparisonEvaluator extends AbstractComparisonEvaluator {
-        public LessThanComparisonEvaluator(DataOutput out, IEvaluatorFactory evalLeftFactory,
-                IEvaluatorFactory evalRightFactory) throws AlgebricksException {
+        public LessThanComparisonEvaluator(DataOutput out, ICopyEvaluatorFactory evalLeftFactory,
+                ICopyEvaluatorFactory evalRightFactory) throws AlgebricksException {
             super(out, evalLeftFactory, evalRightFactory);
         }
 
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ABooleanConstructorDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ABooleanConstructorDescriptor.java
index c379b58..1617dc0 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ABooleanConstructorDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ABooleanConstructorDescriptor.java
@@ -15,8 +15,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparator;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
@@ -37,17 +37,17 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-                return new IEvaluator() {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+                return new ICopyEvaluator() {
 
                     private DataOutput out = output.getDataOutput();
                     private ArrayBackedValueStorage outInput = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(outInput);
+                    private ICopyEvaluator eval = args[0].createEvaluator(outInput);
                     private String errorMessage = "This can not be an instance of boolean";
                     private final byte[] TRUE = { 0, 4, 't', 'r', 'u', 'e' };
                     private final byte[] FALSE = { 0, 5, 'f', 'a', 'l', 's', 'e' };
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ACircleConstructorDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ACircleConstructorDescriptor.java
index 57e6f22..dd4f9ef 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ACircleConstructorDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ACircleConstructorDescriptor.java
@@ -16,8 +16,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -36,18 +36,18 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-                return new IEvaluator() {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+                return new ICopyEvaluator() {
 
                     private DataOutput out = output.getDataOutput();
 
                     private ArrayBackedValueStorage outInput = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(outInput);
+                    private ICopyEvaluator eval = args[0].createEvaluator(outInput);
                     private String errorMessage = "This can not be an instance of circle";
                     private AMutablePoint aPoint = new AMutablePoint(0, 0);
                     private AMutableCircle aCircle = new AMutableCircle(null, 0);
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ADateConstructorDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ADateConstructorDescriptor.java
index ab32e1e..cfbddf5 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ADateConstructorDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ADateConstructorDescriptor.java
@@ -15,8 +15,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -35,18 +35,18 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-                return new IEvaluator() {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+                return new ICopyEvaluator() {
 
                     private DataOutput out = output.getDataOutput();
 
                     private ArrayBackedValueStorage outInput = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(outInput);
+                    private ICopyEvaluator eval = args[0].createEvaluator(outInput);
                     private int offset;
                     private short year, month, day, hour, minute, value;
                     private byte timezonePart = 0;
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ADateTimeConstructorDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ADateTimeConstructorDescriptor.java
index 1e53cf2..56c9dcf 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ADateTimeConstructorDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ADateTimeConstructorDescriptor.java
@@ -15,8 +15,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -36,18 +36,18 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-                return new IEvaluator() {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+                return new ICopyEvaluator() {
 
                     private DataOutput out = output.getDataOutput();
 
                     private ArrayBackedValueStorage outInput = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(outInput);
+                    private ICopyEvaluator eval = args[0].createEvaluator(outInput);
                     private int offset;
                     private short hour, minute, second, msecond, year, month, day, timezoneHour, timezoneMinute, value;
                     private byte timezonePart = 0;
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ADoubleConstructorDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ADoubleConstructorDescriptor.java
index 271ae78..eea58651 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ADoubleConstructorDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ADoubleConstructorDescriptor.java
@@ -16,8 +16,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparator;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
@@ -38,18 +38,18 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-                return new IEvaluator() {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+                return new ICopyEvaluator() {
 
                     private DataOutput out = output.getDataOutput();
 
                     private ArrayBackedValueStorage outInput = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(outInput);
+                    private ICopyEvaluator eval = args[0].createEvaluator(outInput);
                     private String errorMessage = "This can not be an instance of double";
                     private final byte[] POSITIVE_INF = { 0, 3, 'I', 'N', 'F' };
                     private final byte[] NEGATIVE_INF = { 0, 4, '-', 'I', 'N', 'F' };
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ADurationConstructorDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ADurationConstructorDescriptor.java
index 1d3760f..feb2fd7 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ADurationConstructorDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ADurationConstructorDescriptor.java
@@ -15,8 +15,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -36,18 +36,18 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-                return new IEvaluator() {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+                return new ICopyEvaluator() {
 
                     private DataOutput out = output.getDataOutput();
 
                     private ArrayBackedValueStorage outInput = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(outInput);
+                    private ICopyEvaluator eval = args[0].createEvaluator(outInput);
                     private int offset;
                     private int value = 0, hour = 0, minute = 0, second = 0, year = 0, month = 0, day = 0;
                     private boolean isYear = true, isMonth = true, isDay = true, isHour = true, isMinute = true,
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/AFloatConstructorDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/AFloatConstructorDescriptor.java
index 53a823c..852b6d4 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/AFloatConstructorDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/AFloatConstructorDescriptor.java
@@ -16,8 +16,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparator;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
@@ -37,17 +37,17 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-                return new IEvaluator() {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+                return new ICopyEvaluator() {
 
                     private DataOutput out = output.getDataOutput();
                     private ArrayBackedValueStorage outInput = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(outInput);
+                    private ICopyEvaluator eval = args[0].createEvaluator(outInput);
                     private String errorMessage = "This can not be an instance of float";
                     private final byte[] POSITIVE_INF = { 0, 3, 'I', 'N', 'F' };
                     private final byte[] NEGATIVE_INF = { 0, 4, '-', 'I', 'N', 'F' };
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/AInt16ConstructorDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/AInt16ConstructorDescriptor.java
index ce0bc25..46e6987 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/AInt16ConstructorDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/AInt16ConstructorDescriptor.java
@@ -15,8 +15,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -35,18 +35,18 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-                return new IEvaluator() {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+                return new ICopyEvaluator() {
 
                     private DataOutput out = output.getDataOutput();
 
                     private ArrayBackedValueStorage outInput = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(outInput);
+                    private ICopyEvaluator eval = args[0].createEvaluator(outInput);
                     private short value;
                     private int offset;
                     private boolean positive;
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/AInt32ConstructorDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/AInt32ConstructorDescriptor.java
index f3e2faf..a8befc7 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/AInt32ConstructorDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/AInt32ConstructorDescriptor.java
@@ -15,8 +15,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -35,18 +35,18 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-                return new IEvaluator() {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+                return new ICopyEvaluator() {
 
                     private DataOutput out = output.getDataOutput();
 
                     private ArrayBackedValueStorage outInput = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(outInput);
+                    private ICopyEvaluator eval = args[0].createEvaluator(outInput);
                     private int value, offset;
                     private boolean positive;
                     private String errorMessage = "This can not be an instance of int32";
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/AInt64ConstructorDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/AInt64ConstructorDescriptor.java
index a307da2..a3b635d 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/AInt64ConstructorDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/AInt64ConstructorDescriptor.java
@@ -15,8 +15,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -35,18 +35,18 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-                return new IEvaluator() {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+                return new ICopyEvaluator() {
 
                     private DataOutput out = output.getDataOutput();
 
                     private ArrayBackedValueStorage outInput = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(outInput);
+                    private ICopyEvaluator eval = args[0].createEvaluator(outInput);
                     private long value;
                     private int offset;
                     private boolean positive;
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/AInt8ConstructorDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/AInt8ConstructorDescriptor.java
index 983ffe7..0e6e94d 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/AInt8ConstructorDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/AInt8ConstructorDescriptor.java
@@ -15,8 +15,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -35,18 +35,18 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-                return new IEvaluator() {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+                return new ICopyEvaluator() {
 
                     private DataOutput out = output.getDataOutput();
 
                     private ArrayBackedValueStorage outInput = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(outInput);
+                    private ICopyEvaluator eval = args[0].createEvaluator(outInput);
                     private byte value;
                     private int offset;
                     private boolean positive;
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ALineConstructorDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ALineConstructorDescriptor.java
index 2cc090a..c64f745 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ALineConstructorDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ALineConstructorDescriptor.java
@@ -16,8 +16,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -36,18 +36,18 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-                return new IEvaluator() {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+                return new ICopyEvaluator() {
 
                     private DataOutput out = output.getDataOutput();
 
                     private ArrayBackedValueStorage outInput = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(outInput);
+                    private ICopyEvaluator eval = args[0].createEvaluator(outInput);
                     private String errorMessage = "This can not be an instance of line";
                     private AMutableLine aLine = new AMutableLine(null, null);
                     private AMutablePoint[] aPoint = { new AMutablePoint(0, 0), new AMutablePoint(0, 0) };
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ANullConstructorDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ANullConstructorDescriptor.java
index a94d581..ff76339 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ANullConstructorDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ANullConstructorDescriptor.java
@@ -14,8 +14,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparator;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
@@ -34,17 +34,17 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-                return new IEvaluator() {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+                return new ICopyEvaluator() {
 
                     private DataOutput out = output.getDataOutput();
                     private ArrayBackedValueStorage outInput = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(outInput);
+                    private ICopyEvaluator eval = args[0].createEvaluator(outInput);
                     private String errorMessage = "This can not be an instance of null";
                     private final byte[] NULL = { 0, 4, 'n', 'u', 'l', 'l' };
                     IBinaryComparator utf8BinaryComparator = AqlBinaryComparatorFactoryProvider.UTF8STRING_POINTABLE_INSTANCE
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/APoint3DConstructorDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/APoint3DConstructorDescriptor.java
index 5169362..0434a5f 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/APoint3DConstructorDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/APoint3DConstructorDescriptor.java
@@ -15,8 +15,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -36,18 +36,18 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-                return new IEvaluator() {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+                return new ICopyEvaluator() {
 
                     private DataOutput out = output.getDataOutput();
 
                     private ArrayBackedValueStorage outInput = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(outInput);
+                    private ICopyEvaluator eval = args[0].createEvaluator(outInput);
                     private String errorMessage = "This can not be an instance of point3d";
                     private AMutablePoint3D aPoint3D = new AMutablePoint3D(0, 0, 0);
                     @SuppressWarnings("unchecked")
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/APointConstructorDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/APointConstructorDescriptor.java
index 22c89dc..840f141 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/APointConstructorDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/APointConstructorDescriptor.java
@@ -15,8 +15,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -35,18 +35,18 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-                return new IEvaluator() {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+                return new ICopyEvaluator() {
 
                     private DataOutput out = output.getDataOutput();
 
                     private ArrayBackedValueStorage outInput = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(outInput);
+                    private ICopyEvaluator eval = args[0].createEvaluator(outInput);
                     private String errorMessage = "This can not be an instance of point";
                     private AMutablePoint aPoint = new AMutablePoint(0, 0);
                     @SuppressWarnings("unchecked")
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/APolygonConstructorDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/APolygonConstructorDescriptor.java
index 6511b2d..705ae78 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/APolygonConstructorDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/APolygonConstructorDescriptor.java
@@ -14,8 +14,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -36,18 +36,18 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-                return new IEvaluator() {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+                return new ICopyEvaluator() {
 
                     private DataOutput out = output.getDataOutput();
 
                     private ArrayBackedValueStorage outInput = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(outInput);
+                    private ICopyEvaluator eval = args[0].createEvaluator(outInput);
                     private String errorMessage = "This can not be an instance of polygon";
                     @SuppressWarnings("unchecked")
                     private ISerializerDeserializer<ANull> nullSerde = AqlSerializerDeserializerProvider.INSTANCE
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ARectangleConstructorDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ARectangleConstructorDescriptor.java
index 4ffd671..5f5b3b3 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ARectangleConstructorDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ARectangleConstructorDescriptor.java
@@ -16,8 +16,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -37,18 +37,18 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-                return new IEvaluator() {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+                return new ICopyEvaluator() {
 
                     private DataOutput out = output.getDataOutput();
 
                     private ArrayBackedValueStorage outInput = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(outInput);
+                    private ICopyEvaluator eval = args[0].createEvaluator(outInput);
                     private String errorMessage = "This can not be an instance of rectangle";
                     private AMutableRectangle aRectangle = new AMutableRectangle(null, null);
                     private AMutablePoint[] aPoint = { new AMutablePoint(0, 0), new AMutablePoint(0, 0) };
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/AStringConstructorDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/AStringConstructorDescriptor.java
index 11aa889..abe1743 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/AStringConstructorDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/AStringConstructorDescriptor.java
@@ -13,8 +13,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -34,17 +34,17 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-                return new IEvaluator() {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+                return new ICopyEvaluator() {
 
                     private DataOutput out = output.getDataOutput();
                     private ArrayBackedValueStorage outInput = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(outInput);
+                    private ICopyEvaluator eval = args[0].createEvaluator(outInput);
                     private String errorMessage = "This can not be an instance of string";
                     @SuppressWarnings("unchecked")
                     private ISerializerDeserializer<ANull> nullSerde = AqlSerializerDeserializerProvider.INSTANCE
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ATimeConstructorDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ATimeConstructorDescriptor.java
index 46f0738..c262d9f 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ATimeConstructorDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/constructors/ATimeConstructorDescriptor.java
@@ -15,8 +15,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -36,18 +36,18 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-                return new IEvaluator() {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+                return new ICopyEvaluator() {
 
                     private DataOutput out = output.getDataOutput();
 
                     private ArrayBackedValueStorage outInput = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(outInput);
+                    private ICopyEvaluator eval = args[0].createEvaluator(outInput);
                     private int offset;
                     private short hour, minute, second, msecond, timezoneHour, timezoneMinute, value;
                     private byte timezonePart = 0;
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/AbstractStringContainsEval.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/AbstractStringContainsEval.java
index 9225f6a..1920db4 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/AbstractStringContainsEval.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/AbstractStringContainsEval.java
@@ -6,27 +6,27 @@
 import edu.uci.ics.asterix.om.base.ABoolean;
 import edu.uci.ics.asterix.om.types.BuiltinType;
 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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 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.IFrameTupleReference;
 
-public abstract class AbstractStringContainsEval implements IEvaluator {
+public abstract class AbstractStringContainsEval implements ICopyEvaluator {
 
     private DataOutput dout;
 
     private ArrayBackedValueStorage array0 = new ArrayBackedValueStorage();
     private ArrayBackedValueStorage array1 = new ArrayBackedValueStorage();
-    private IEvaluator evalString;
-    private IEvaluator evalPattern;
+    private ICopyEvaluator evalString;
+    private ICopyEvaluator evalPattern;
     @SuppressWarnings("rawtypes")
     private ISerializerDeserializer boolSerde = AqlSerializerDeserializerProvider.INSTANCE
             .getSerializerDeserializer(BuiltinType.ABOOLEAN);
 
-    public AbstractStringContainsEval(DataOutput dout, IEvaluatorFactory evalStringFactory,
-            IEvaluatorFactory evalPatternFactory) throws AlgebricksException {
+    public AbstractStringContainsEval(DataOutput dout, ICopyEvaluatorFactory evalStringFactory,
+            ICopyEvaluatorFactory evalPatternFactory) throws AlgebricksException {
         this.dout = dout;
         this.evalString = evalStringFactory.createEvaluator(array0);
         this.evalPattern = evalPatternFactory.createEvaluator(array1);
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/AndDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/AndDescriptor.java
index 6a46c6d..355d30e 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/AndDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/AndDescriptor.java
@@ -12,8 +12,8 @@
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 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.runtime.base.IEvaluator;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
@@ -39,21 +39,21 @@
     }
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
 
-        return new IEvaluatorFactory() {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
                 // one temp. buffer re-used by all children
                 final ArrayBackedValueStorage argOut = new ArrayBackedValueStorage();
-                final IEvaluator[] evals = new IEvaluator[args.length];
+                final ICopyEvaluator[] evals = new ICopyEvaluator[args.length];
                 for (int i = 0; i < evals.length; i++) {
                     evals[i] = args[i].createEvaluator(argOut);
                 }
 
-                return new IEvaluator() {
+                return new ICopyEvaluator() {
                     @SuppressWarnings("unchecked")
                     private ISerializerDeserializer<ABoolean> booleanSerde = AqlSerializerDeserializerProvider.INSTANCE
                             .getSerializerDeserializer(BuiltinType.ABOOLEAN);
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/AnyCollectionMemberDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/AnyCollectionMemberDescriptor.java
index aa8b430..a71436c 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/AnyCollectionMemberDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/AnyCollectionMemberDescriptor.java
@@ -18,8 +18,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -37,7 +37,7 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) {
         return new AnyCollectionMemberEvalFactory(args[0]);
     }
 
@@ -46,11 +46,11 @@
         return FID;
     }
 
-    private static class AnyCollectionMemberEvalFactory implements IEvaluatorFactory {
+    private static class AnyCollectionMemberEvalFactory implements ICopyEvaluatorFactory {
 
         private static final long serialVersionUID = 1L;
 
-        private IEvaluatorFactory listEvalFactory;
+        private ICopyEvaluatorFactory listEvalFactory;
         private final static byte SER_ORDEREDLIST_TYPE_TAG = ATypeTag.ORDEREDLIST.serialize();
         private final static byte SER_UNORDEREDLIST_TYPE_TAG = ATypeTag.UNORDEREDLIST.serialize();
         private final static byte SER_NULL_TYPE_TAG = ATypeTag.NULL.serialize();
@@ -58,17 +58,17 @@
         private ATypeTag itemTag;
         private boolean selfDescList = false;
 
-        public AnyCollectionMemberEvalFactory(IEvaluatorFactory arg) {
+        public AnyCollectionMemberEvalFactory(ICopyEvaluatorFactory arg) {
             this.listEvalFactory = arg;
         }
 
         @Override
-        public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-            return new IEvaluator() {
+        public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+            return new ICopyEvaluator() {
 
                 private DataOutput out = output.getDataOutput();
                 private ArrayBackedValueStorage outInputList = new ArrayBackedValueStorage();
-                private IEvaluator evalList = listEvalFactory.createEvaluator(outInputList);
+                private ICopyEvaluator evalList = listEvalFactory.createEvaluator(outInputList);
                 @SuppressWarnings("unchecked")
                 private ISerializerDeserializer<ANull> nullSerde = AqlSerializerDeserializerProvider.INSTANCE
                         .getSerializerDeserializer(BuiltinType.ANULL);
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CastRecordDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CastRecordDescriptor.java
index 32498c3..a9f25f4 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CastRecordDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CastRecordDescriptor.java
@@ -14,8 +14,8 @@
 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.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 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;
@@ -45,19 +45,19 @@
     }
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) {
-        final IEvaluatorFactory recordEvalFactory = args[0];
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) {
+        final ICopyEvaluatorFactory recordEvalFactory = args[0];
 
-        return new IEvaluatorFactory() {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
                 final DataOutput out = output.getDataOutput();
                 final ArrayBackedValueStorage recordBuffer = new ArrayBackedValueStorage();
-                final IEvaluator recEvaluator = recordEvalFactory.createEvaluator(recordBuffer);
+                final ICopyEvaluator recEvaluator = recordEvalFactory.createEvaluator(recordBuffer);
 
-                return new IEvaluator() {
+                return new ICopyEvaluator() {
                     // pointable allocator
                     private PointableAllocator allocator = new PointableAllocator();
                     final IVisitablePointable recAccessor = allocator.allocateRecordValue(inputType);
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/ClosedRecordConstructorDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/ClosedRecordConstructorDescriptor.java
index d9afbc9..980a6c8 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/ClosedRecordConstructorDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/ClosedRecordConstructorDescriptor.java
@@ -7,7 +7,7 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.asterix.runtime.evaluators.common.ClosedRecordConstructorEvalFactory;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 
 public class ClosedRecordConstructorDescriptor extends AbstractScalarFunctionDynamicDescriptor {
 
@@ -33,7 +33,7 @@
     }
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) {
         return new ClosedRecordConstructorEvalFactory(args, recType);
     }
 
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/ContainsDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/ContainsDescriptor.java
index 71213c7..8dcf5c2 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/ContainsDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/ContainsDescriptor.java
@@ -8,8 +8,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.data.std.primitive.UTF8StringPointable;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
 
@@ -25,13 +25,13 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
 
-        return new IEvaluatorFactory() {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
 
                 DataOutput dout = output.getDataOutput();
 
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CountHashedGramTokensDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CountHashedGramTokensDescriptor.java
index 9cdecde..c8f3447 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CountHashedGramTokensDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CountHashedGramTokensDescriptor.java
@@ -13,8 +13,8 @@
 import edu.uci.ics.fuzzyjoin.tokenizer.NGramUTF8StringBinaryTokenizer;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
 
 public class CountHashedGramTokensDescriptor extends AbstractScalarFunctionDynamicDescriptor {
@@ -34,12 +34,12 @@
     }
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
                 ITokenFactory tokenFactory = new HashedUTF8NGramTokenFactory(ATypeTag.INT32.serialize(),
                         ATypeTag.INT32.serialize());
                 NGramUTF8StringBinaryTokenizer tokenizer = new NGramUTF8StringBinaryTokenizer(3, true, false, true,
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CountHashedWordTokensDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CountHashedWordTokensDescriptor.java
index 0cfdfc3..4c96ca0 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CountHashedWordTokensDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CountHashedWordTokensDescriptor.java
@@ -14,8 +14,8 @@
 import edu.uci.ics.fuzzyjoin.tokenizer.ITokenFactory;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
 
 public class CountHashedWordTokensDescriptor extends AbstractScalarFunctionDynamicDescriptor {
@@ -35,12 +35,12 @@
     }
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
                 ITokenFactory tokenFactory = new HashedUTF8WordTokenFactory(ATypeTag.INT32.serialize(),
                         ATypeTag.INT32.serialize());
                 IBinaryTokenizer tokenizer = new DelimitedUTF8StringBinaryTokenizer(false, true, tokenFactory);
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CreateCircleDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CreateCircleDescriptor.java
index 76c2206..e8c57c4 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CreateCircleDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CreateCircleDescriptor.java
@@ -17,8 +17,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -36,20 +36,20 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-                return new IEvaluator() {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+                return new ICopyEvaluator() {
 
                     private DataOutput out = output.getDataOutput();
 
                     private ArrayBackedValueStorage outInput0 = new ArrayBackedValueStorage();
                     private ArrayBackedValueStorage outInput1 = new ArrayBackedValueStorage();
-                    private IEvaluator eval0 = args[0].createEvaluator(outInput0);
-                    private IEvaluator eval1 = args[1].createEvaluator(outInput1);
+                    private ICopyEvaluator eval0 = args[0].createEvaluator(outInput0);
+                    private ICopyEvaluator eval1 = args[1].createEvaluator(outInput1);
                     private AMutablePoint aPoint = new AMutablePoint(0, 0);
                     private AMutableCircle aCircle = new AMutableCircle(null, 0);
                     @SuppressWarnings("unchecked")
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CreateLineDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CreateLineDescriptor.java
index 8ca81cd..a6ca67b 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CreateLineDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CreateLineDescriptor.java
@@ -17,8 +17,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -36,20 +36,20 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-                return new IEvaluator() {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+                return new ICopyEvaluator() {
 
                     private DataOutput out = output.getDataOutput();
 
                     private ArrayBackedValueStorage outInput0 = new ArrayBackedValueStorage();
                     private ArrayBackedValueStorage outInput1 = new ArrayBackedValueStorage();
-                    private IEvaluator eval0 = args[0].createEvaluator(outInput0);
-                    private IEvaluator eval1 = args[1].createEvaluator(outInput1);
+                    private ICopyEvaluator eval0 = args[0].createEvaluator(outInput0);
+                    private ICopyEvaluator eval1 = args[1].createEvaluator(outInput1);
                     private AMutableLine aLine = new AMutableLine(null, null);
                     private AMutablePoint[] aPoint = { new AMutablePoint(0, 0), new AMutablePoint(0, 0) };
                     @SuppressWarnings("unchecked")
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CreateMBRDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CreateMBRDescriptor.java
index 0974c39..cd3790c 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CreateMBRDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CreateMBRDescriptor.java
@@ -7,7 +7,7 @@
 import edu.uci.ics.asterix.runtime.evaluators.common.CreateMBREvalFactory;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 
 public class CreateMBRDescriptor extends AbstractScalarFunctionDynamicDescriptor {
 
@@ -21,7 +21,7 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
         return new CreateMBREvalFactory(args[0], args[1], args[2]);
     }
 
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CreatePointDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CreatePointDescriptor.java
index 2a4a0f1..82d1013 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CreatePointDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CreatePointDescriptor.java
@@ -14,8 +14,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -33,20 +33,20 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-                return new IEvaluator() {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+                return new ICopyEvaluator() {
 
                     private DataOutput out = output.getDataOutput();
 
                     private ArrayBackedValueStorage outInput0 = new ArrayBackedValueStorage();
                     private ArrayBackedValueStorage outInput1 = new ArrayBackedValueStorage();
-                    private IEvaluator eval0 = args[0].createEvaluator(outInput0);
-                    private IEvaluator eval1 = args[1].createEvaluator(outInput1);
+                    private ICopyEvaluator eval0 = args[0].createEvaluator(outInput0);
+                    private ICopyEvaluator eval1 = args[1].createEvaluator(outInput1);
                     private AMutablePoint aPoint = new AMutablePoint(0, 0);
                     @SuppressWarnings("unchecked")
                     private ISerializerDeserializer<APoint> pointSerde = AqlSerializerDeserializerProvider.INSTANCE
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CreatePolygonDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CreatePolygonDescriptor.java
index eb3959e..a095111 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CreatePolygonDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CreatePolygonDescriptor.java
@@ -10,8 +10,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 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;
@@ -28,17 +28,17 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             private DataOutput out;
             private ArrayBackedValueStorage outInput;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
 
-                final IEvaluator[] argEvals = new IEvaluator[args.length];
+                final ICopyEvaluator[] argEvals = new ICopyEvaluator[args.length];
                 out = output.getDataOutput();
 
                 outInput = new ArrayBackedValueStorage();
@@ -47,7 +47,7 @@
                     argEvals[i] = args[i].createEvaluator(outInput);
                 }
 
-                return new IEvaluator() {
+                return new ICopyEvaluator() {
 
                     @Override
                     public void evaluate(IFrameTupleReference tuple) throws AlgebricksException {
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CreateRectangleDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CreateRectangleDescriptor.java
index 9d7bb5f..d7945fa 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CreateRectangleDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/CreateRectangleDescriptor.java
@@ -17,8 +17,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -36,19 +36,19 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-                return new IEvaluator() {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+                return new ICopyEvaluator() {
                     private DataOutput out = output.getDataOutput();
 
                     private ArrayBackedValueStorage outInput0 = new ArrayBackedValueStorage();
                     private ArrayBackedValueStorage outInput1 = new ArrayBackedValueStorage();
-                    private IEvaluator eval0 = args[0].createEvaluator(outInput0);
-                    private IEvaluator eval1 = args[1].createEvaluator(outInput1);
+                    private ICopyEvaluator eval0 = args[0].createEvaluator(outInput0);
+                    private ICopyEvaluator eval1 = args[1].createEvaluator(outInput1);
                     private AMutableRectangle aRectangle = new AMutableRectangle(null, null);
                     private AMutablePoint[] aPoint = { new AMutablePoint(0, 0), new AMutablePoint(0, 0) };
                     @SuppressWarnings("unchecked")
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/EditDistanceCheckDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/EditDistanceCheckDescriptor.java
index 550cfc4..1c1dae3 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/EditDistanceCheckDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/EditDistanceCheckDescriptor.java
@@ -16,8 +16,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.common.EditDistanceEvaluator;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -36,12 +36,12 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
                 return new EditDistanceCheckEvaluator(args, output);
             }
         };
@@ -54,7 +54,7 @@
 
     private static class EditDistanceCheckEvaluator extends EditDistanceEvaluator {
 
-        private final IEvaluator edThreshEval;
+        private final ICopyEvaluator edThreshEval;
         private int edThresh = -1;
         private IAOrderedListBuilder listBuilder;
         private ArrayBackedValueStorage inputVal;
@@ -62,7 +62,7 @@
         private final ISerializerDeserializer<ABoolean> booleanSerde = AqlSerializerDeserializerProvider.INSTANCE
                 .getSerializerDeserializer(BuiltinType.ABOOLEAN);
 
-        public EditDistanceCheckEvaluator(IEvaluatorFactory[] args, IDataOutputProvider output)
+        public EditDistanceCheckEvaluator(ICopyEvaluatorFactory[] args, IDataOutputProvider output)
                 throws AlgebricksException {
             super(args, output);
             edThreshEval = args[2].createEvaluator(argOut);
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/EditDistanceDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/EditDistanceDescriptor.java
index 9efa9f5..a7246fc 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/EditDistanceDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/EditDistanceDescriptor.java
@@ -8,8 +8,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.common.EditDistanceEvaluator;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
 
 public class EditDistanceDescriptor extends AbstractScalarFunctionDynamicDescriptor {
@@ -24,12 +24,12 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
                 return new EditDistanceEvaluator(args, output);
             }
         };
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/EmbedTypeDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/EmbedTypeDescriptor.java
index cef79b0..26bfea4 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/EmbedTypeDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/EmbedTypeDescriptor.java
@@ -7,8 +7,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
 
@@ -31,15 +31,15 @@
     }
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) {
+        return new ICopyEvaluatorFactory() {
 
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
                 // TODO Auto-generated method stub
-                return new IEvaluator() {
+                return new ICopyEvaluator() {
 
                     @Override
                     public void evaluate(IFrameTupleReference tuple) throws AlgebricksException {
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/EndsWithDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/EndsWithDescriptor.java
index 669c480..d8a5367 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/EndsWithDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/EndsWithDescriptor.java
@@ -8,8 +8,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.data.std.primitive.UTF8StringPointable;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
 
@@ -25,13 +25,13 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
 
-        return new IEvaluatorFactory() {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
 
                 DataOutput dout = output.getDataOutput();
 
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/FieldAccessByIndexDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/FieldAccessByIndexDescriptor.java
index 92e1040..a0c1ad2 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/FieldAccessByIndexDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/FieldAccessByIndexDescriptor.java
@@ -7,7 +7,7 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.asterix.runtime.evaluators.common.FieldAccessByIndexEvalFactory;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 
 public class FieldAccessByIndexDescriptor extends AbstractScalarFunctionDynamicDescriptor {
 
@@ -32,7 +32,7 @@
     }
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(IEvaluatorFactory[] args) {
+    public ICopyEvaluatorFactory createEvaluatorFactory(ICopyEvaluatorFactory[] args) {
         return new FieldAccessByIndexEvalFactory(args[0], args[1], recType);
     }
 
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/FieldAccessByNameDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/FieldAccessByNameDescriptor.java
index a0b4af0..2ac483b 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/FieldAccessByNameDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/FieldAccessByNameDescriptor.java
@@ -17,8 +17,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -41,35 +41,35 @@
     }
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(IEvaluatorFactory[] args) {
+    public ICopyEvaluatorFactory createEvaluatorFactory(ICopyEvaluatorFactory[] args) {
         return new FieldAccessByNameEvalFactory(args[0], args[1]);
     }
 
-    private static class FieldAccessByNameEvalFactory implements IEvaluatorFactory {
+    private static class FieldAccessByNameEvalFactory implements ICopyEvaluatorFactory {
 
         private static final long serialVersionUID = 1L;
 
-        private IEvaluatorFactory recordEvalFactory;
-        private IEvaluatorFactory fldNameEvalFactory;
+        private ICopyEvaluatorFactory recordEvalFactory;
+        private ICopyEvaluatorFactory fldNameEvalFactory;
 
         private final static byte SER_NULL_TYPE_TAG = ATypeTag.NULL.serialize();
         private final static byte SER_RECORD_TYPE_TAG = ATypeTag.RECORD.serialize();
 
-        public FieldAccessByNameEvalFactory(IEvaluatorFactory recordEvalFactory, IEvaluatorFactory fldNameEvalFactory) {
+        public FieldAccessByNameEvalFactory(ICopyEvaluatorFactory recordEvalFactory, ICopyEvaluatorFactory fldNameEvalFactory) {
             this.recordEvalFactory = recordEvalFactory;
             this.fldNameEvalFactory = fldNameEvalFactory;
         }
 
         @Override
-        public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-            return new IEvaluator() {
+        public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+            return new ICopyEvaluator() {
 
                 private DataOutput out = output.getDataOutput();
 
                 private ArrayBackedValueStorage outInput0 = new ArrayBackedValueStorage();
                 private ArrayBackedValueStorage outInput1 = new ArrayBackedValueStorage();
-                private IEvaluator eval0 = recordEvalFactory.createEvaluator(outInput0);
-                private IEvaluator eval1 = fldNameEvalFactory.createEvaluator(outInput1);
+                private ICopyEvaluator eval0 = recordEvalFactory.createEvaluator(outInput0);
+                private ICopyEvaluator eval1 = fldNameEvalFactory.createEvaluator(outInput1);
                 @SuppressWarnings("unchecked")
                 private ISerializerDeserializer<ANull> nullSerde = AqlSerializerDeserializerProvider.INSTANCE
                         .getSerializerDeserializer(BuiltinType.ANULL);
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/FuzzyEqDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/FuzzyEqDescriptor.java
index 4551704..623783e 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/FuzzyEqDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/FuzzyEqDescriptor.java
@@ -7,7 +7,7 @@
 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.functions.FunctionIdentifier;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 
 public class FuzzyEqDescriptor extends AbstractScalarFunctionDynamicDescriptor {
 
@@ -21,7 +21,7 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(IEvaluatorFactory[] args) throws AlgebricksException {
+    public ICopyEvaluatorFactory createEvaluatorFactory(ICopyEvaluatorFactory[] args) throws AlgebricksException {
         throw new NotImplementedException();
     }
 
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/GetItemDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/GetItemDescriptor.java
index 34ea593..f8470b0 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/GetItemDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/GetItemDescriptor.java
@@ -17,8 +17,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -37,7 +37,7 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) {
         return new GetItemEvalFactory(args);
     }
 
@@ -46,32 +46,32 @@
         return FID;
     }
 
-    private static class GetItemEvalFactory implements IEvaluatorFactory {
+    private static class GetItemEvalFactory implements ICopyEvaluatorFactory {
 
         private static final long serialVersionUID = 1L;
 
-        private IEvaluatorFactory listEvalFactory;
-        private IEvaluatorFactory indexEvalFactory;
+        private ICopyEvaluatorFactory listEvalFactory;
+        private ICopyEvaluatorFactory indexEvalFactory;
         private final static byte SER_ORDEREDLIST_TYPE_TAG = ATypeTag.ORDEREDLIST.serialize();
         private final static byte SER_NULL_TYPE_TAG = ATypeTag.NULL.serialize();
         private byte serItemTypeTag;
         private ATypeTag itemTag;
         private boolean selfDescList = false;
 
-        public GetItemEvalFactory(IEvaluatorFactory[] args) {
+        public GetItemEvalFactory(ICopyEvaluatorFactory[] args) {
             this.listEvalFactory = args[0];
             this.indexEvalFactory = args[1];
         }
 
         @Override
-        public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-            return new IEvaluator() {
+        public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+            return new ICopyEvaluator() {
 
                 private DataOutput out = output.getDataOutput();
                 private ArrayBackedValueStorage outInputList = new ArrayBackedValueStorage();
                 private ArrayBackedValueStorage outInputIdx = new ArrayBackedValueStorage();
-                private IEvaluator evalList = listEvalFactory.createEvaluator(outInputList);
-                private IEvaluator evalIdx = indexEvalFactory.createEvaluator(outInputIdx);
+                private ICopyEvaluator evalList = listEvalFactory.createEvaluator(outInputList);
+                private ICopyEvaluator evalIdx = indexEvalFactory.createEvaluator(outInputIdx);
                 @SuppressWarnings("unchecked")
                 private ISerializerDeserializer<ANull> nullSerde = AqlSerializerDeserializerProvider.INSTANCE
                         .getSerializerDeserializer(BuiltinType.ANULL);
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/GramTokensDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/GramTokensDescriptor.java
index 50c4283..3d1fce6 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/GramTokensDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/GramTokensDescriptor.java
@@ -12,8 +12,8 @@
 import edu.uci.ics.fuzzyjoin.tokenizer.UTF8NGramTokenFactory;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
 
 public class GramTokensDescriptor extends AbstractScalarFunctionDynamicDescriptor {
@@ -33,12 +33,12 @@
     }
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
                 ITokenFactory tokenFactory = new UTF8NGramTokenFactory(ATypeTag.STRING.serialize(),
                         ATypeTag.INT32.serialize());
                 NGramUTF8StringBinaryTokenizer tokenizer = new NGramUTF8StringBinaryTokenizer(3, true, true, true,
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/HashedGramTokensDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/HashedGramTokensDescriptor.java
index a240636..df6bc7b 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/HashedGramTokensDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/HashedGramTokensDescriptor.java
@@ -12,8 +12,8 @@
 import edu.uci.ics.fuzzyjoin.tokenizer.NGramUTF8StringBinaryTokenizer;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
 
 public class HashedGramTokensDescriptor extends AbstractScalarFunctionDynamicDescriptor {
@@ -33,12 +33,12 @@
     }
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
                 ITokenFactory tokenFactory = new HashedUTF8NGramTokenFactory(ATypeTag.INT32.serialize(),
                         ATypeTag.INT32.serialize());
                 NGramUTF8StringBinaryTokenizer tokenizer = new NGramUTF8StringBinaryTokenizer(3, true, true, true,
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/HashedWordTokensDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/HashedWordTokensDescriptor.java
index c0b7253..ac756f2 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/HashedWordTokensDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/HashedWordTokensDescriptor.java
@@ -14,8 +14,8 @@
 import edu.uci.ics.fuzzyjoin.tokenizer.ITokenFactory;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
 
 public class HashedWordTokensDescriptor extends AbstractScalarFunctionDynamicDescriptor {
@@ -35,12 +35,12 @@
     }
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
                 ITokenFactory tokenFactory = new HashedUTF8WordTokenFactory(ATypeTag.INT32.serialize(),
                         ATypeTag.INT32.serialize());
                 IBinaryTokenizer tokenizer = new DelimitedUTF8StringBinaryTokenizer(true, true, tokenFactory);
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/InjectFailureDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/InjectFailureDescriptor.java
index 941bd53..abd3ae5 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/InjectFailureDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/InjectFailureDescriptor.java
@@ -11,8 +11,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 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;
@@ -34,20 +34,20 @@
     }
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
 
-        return new IEvaluatorFactory() {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
 
                 final ArrayBackedValueStorage argOut = new ArrayBackedValueStorage();
-                final IEvaluator[] evals = new IEvaluator[args.length];
+                final ICopyEvaluator[] evals = new ICopyEvaluator[args.length];
                 evals[0] = args[0].createEvaluator(argOut);
                 evals[1] = args[1].createEvaluator(argOut);
 
-                return new IEvaluator() {
+                return new ICopyEvaluator() {
 
                     @Override
                     public void evaluate(IFrameTupleReference tuple) throws AlgebricksException {
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/IsNullDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/IsNullDescriptor.java
index 9583c75..5e3b7ab 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/IsNullDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/IsNullDescriptor.java
@@ -11,8 +11,8 @@
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 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.runtime.base.IEvaluator;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 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;
@@ -32,18 +32,18 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
+        return new ICopyEvaluatorFactory() {
 
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-                return new IEvaluator() {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+                return new ICopyEvaluator() {
 
                     private DataOutput out = output.getDataOutput();
                     private ArrayBackedValueStorage argOut = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(argOut);
+                    private ICopyEvaluator eval = args[0].createEvaluator(argOut);
 
                     @Override
                     public void evaluate(IFrameTupleReference tuple) throws AlgebricksException {
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/LenDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/LenDescriptor.java
index b87eb37..0e15a18 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/LenDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/LenDescriptor.java
@@ -17,8 +17,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
@@ -39,19 +39,19 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
 
-        return new IEvaluatorFactory() {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
 
-                return new IEvaluator() {
+                return new ICopyEvaluator() {
 
                     private final DataOutput out = output.getDataOutput();
                     private final ArrayBackedValueStorage inputVal = new ArrayBackedValueStorage();
-                    private final IEvaluator evalList = args[0].createEvaluator(inputVal);
+                    private final ICopyEvaluator evalList = args[0].createEvaluator(inputVal);
 
                     // result
                     private final AMutableInt32 res = new AMutableInt32(0);
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/LikeDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/LikeDescriptor.java
index 3a4af19..1b43441 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/LikeDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/LikeDescriptor.java
@@ -21,8 +21,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparator;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
@@ -53,22 +53,22 @@
     }
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
 
-        return new IEvaluatorFactory() {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
 
                 final DataOutput dout = output.getDataOutput();
 
-                return new IEvaluator() {
+                return new ICopyEvaluator() {
 
                     private boolean first = true;
                     private ArrayBackedValueStorage array0 = new ArrayBackedValueStorage();
-                    private IEvaluator evalString = args[0].createEvaluator(array0);
-                    private IEvaluator evalPattern = args[1].createEvaluator(array0);
+                    private ICopyEvaluator evalString = args[0].createEvaluator(array0);
+                    private ICopyEvaluator evalPattern = args[1].createEvaluator(array0);
                     private ByteArrayAccessibleOutputStream lastPattern = new ByteArrayAccessibleOutputStream();
                     private UTF8CharSequence carSeq = new UTF8CharSequence();
                     private IBinaryComparator strComp = AqlBinaryComparatorFactoryProvider.INSTANCE
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/NotDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/NotDescriptor.java
index 0ddf9f6..abb4e25 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/NotDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/NotDescriptor.java
@@ -14,8 +14,8 @@
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 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.runtime.base.IEvaluator;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
@@ -42,18 +42,18 @@
     }
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
                 final DataOutput out = output.getDataOutput();
 
-                return new IEvaluator() {
+                return new ICopyEvaluator() {
 
                     private ArrayBackedValueStorage argOut = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(argOut);
+                    private ICopyEvaluator eval = args[0].createEvaluator(argOut);
 
                     private String errorMessage = "Not() can only be applied on boolean";
                     @SuppressWarnings("unchecked")
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/NumericAddDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/NumericAddDescriptor.java
index b525bc3..baa20cd 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/NumericAddDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/NumericAddDescriptor.java
@@ -26,8 +26,8 @@
 import edu.uci.ics.hyracks.algebricks.common.exceptions.NotImplementedException;
 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.runtime.base.IEvaluator;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
@@ -51,19 +51,19 @@
     }
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
 
-                return new IEvaluator() {
+                return new ICopyEvaluator() {
                     private DataOutput out = output.getDataOutput();
                     // one temp. buffer re-used by both children
                     private ArrayBackedValueStorage argOut = new ArrayBackedValueStorage();
-                    private IEvaluator evalLeft = args[0].createEvaluator(argOut);
-                    private IEvaluator evalRight = args[1].createEvaluator(argOut);
+                    private ICopyEvaluator evalLeft = args[0].createEvaluator(argOut);
+                    private ICopyEvaluator evalRight = args[1].createEvaluator(argOut);
                     private double[] operands = new double[args.length];
                     private boolean metInt8 = false, metInt16 = false, metInt32 = false, metInt64 = false,
                             metFloat = false, metDouble = false;
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/NumericDivideDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/NumericDivideDescriptor.java
index 39c1fbf..b226ad7 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/NumericDivideDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/NumericDivideDescriptor.java
@@ -26,8 +26,8 @@
 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.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
@@ -51,19 +51,19 @@
     }
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
 
-                return new IEvaluator() {
+                return new ICopyEvaluator() {
                     private DataOutput out = output.getDataOutput();
                     // one temp. buffer re-used by both children
                     private ArrayBackedValueStorage argOut = new ArrayBackedValueStorage();
-                    private IEvaluator evalLeft = args[0].createEvaluator(argOut);
-                    private IEvaluator evalRight = args[1].createEvaluator(argOut);
+                    private ICopyEvaluator evalLeft = args[0].createEvaluator(argOut);
+                    private ICopyEvaluator evalRight = args[1].createEvaluator(argOut);
                     private double[] operands = new double[args.length];
                     private boolean metInt8 = false, metInt16 = false, metInt32 = false, metInt64 = false,
                             metFloat = false, metDouble = false;
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/NumericMultiplyDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/NumericMultiplyDescriptor.java
index ed7626e..aa5eaaa 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/NumericMultiplyDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/NumericMultiplyDescriptor.java
@@ -26,8 +26,8 @@
 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.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
@@ -51,19 +51,19 @@
     }
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
 
-                return new IEvaluator() {
+                return new ICopyEvaluator() {
                     private DataOutput out = output.getDataOutput();
                     // one temp. buffer re-used by both children
                     private ArrayBackedValueStorage argOut = new ArrayBackedValueStorage();
-                    private IEvaluator evalLeft = args[0].createEvaluator(argOut);
-                    private IEvaluator evalRight = args[1].createEvaluator(argOut);
+                    private ICopyEvaluator evalLeft = args[0].createEvaluator(argOut);
+                    private ICopyEvaluator evalRight = args[1].createEvaluator(argOut);
                     private double[] operands = new double[args.length];
                     private boolean metInt8 = false, metInt16 = false, metInt32 = false, metInt64 = false,
                             metFloat = false, metDouble = false;
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/NumericSubtractDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/NumericSubtractDescriptor.java
index 77ae37c..0b53f18 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/NumericSubtractDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/NumericSubtractDescriptor.java
@@ -26,8 +26,8 @@
 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.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
@@ -51,19 +51,19 @@
     }
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
 
-                return new IEvaluator() {
+                return new ICopyEvaluator() {
                     private DataOutput out = output.getDataOutput();
                     // one temp. buffer re-used by both children
                     private ArrayBackedValueStorage argOut = new ArrayBackedValueStorage();
-                    private IEvaluator evalLeft = args[0].createEvaluator(argOut);
-                    private IEvaluator evalRight = args[1].createEvaluator(argOut);
+                    private ICopyEvaluator evalLeft = args[0].createEvaluator(argOut);
+                    private ICopyEvaluator evalRight = args[1].createEvaluator(argOut);
                     private double[] operands = new double[args.length];
                     private boolean metInt8 = false, metInt16 = false, metInt32 = false, metInt64 = false,
                             metFloat = false, metDouble = false;
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/NumericUnaryMinusDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/NumericUnaryMinusDescriptor.java
index 73181d6..7998618 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/NumericUnaryMinusDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/NumericUnaryMinusDescriptor.java
@@ -26,8 +26,8 @@
 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.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
@@ -46,18 +46,18 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
 
-                return new IEvaluator() {
+                return new ICopyEvaluator() {
 
                     private DataOutput out = output.getDataOutput();
                     private ArrayBackedValueStorage argOut = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(argOut);
+                    private ICopyEvaluator eval = args[0].createEvaluator(argOut);
                     private byte serNullTypeTag = ATypeTag.NULL.serialize();
                     private byte serInt8TypeTag = ATypeTag.INT8.serialize();
                     private byte serInt16TypeTag = ATypeTag.INT16.serialize();
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/OpenRecordConstructorDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/OpenRecordConstructorDescriptor.java
index cc53a04..f3681f2 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/OpenRecordConstructorDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/OpenRecordConstructorDescriptor.java
@@ -12,8 +12,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 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;
@@ -43,15 +43,15 @@
     }
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
                 int n = args.length / 2;
-                final IEvaluator[] evalNames = new IEvaluator[n];
-                final IEvaluator[] evalFields = new IEvaluator[n];
+                final ICopyEvaluator[] evalNames = new ICopyEvaluator[n];
+                final ICopyEvaluator[] evalFields = new ICopyEvaluator[n];
                 final ArrayBackedValueStorage fieldNameBuffer = new ArrayBackedValueStorage();
                 final ArrayBackedValueStorage fieldValueBuffer = new ArrayBackedValueStorage();
                 for (int i = 0; i < n; i++) {
@@ -59,7 +59,7 @@
                     evalFields[i] = args[2 * i + 1].createEvaluator(fieldValueBuffer);
                 }
                 final DataOutput out = output.getDataOutput();
-                return new IEvaluator() {
+                return new ICopyEvaluator() {
                     private RecordBuilder recBuilder = new RecordBuilder();
                     private int closedFieldId;
                     private boolean first = true;
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/OrDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/OrDescriptor.java
index c310164..8349c97 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/OrDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/OrDescriptor.java
@@ -12,8 +12,8 @@
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 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.runtime.base.IEvaluator;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
@@ -38,21 +38,21 @@
     }
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
 
-        return new IEvaluatorFactory() {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
                 // one temp. buffer re-used by all children
                 final ArrayBackedValueStorage argOut = new ArrayBackedValueStorage();
-                final IEvaluator[] evals = new IEvaluator[args.length];
+                final ICopyEvaluator[] evals = new ICopyEvaluator[args.length];
                 for (int i = 0; i < evals.length; i++) {
                     evals[i] = args[i].createEvaluator(argOut);
                 }
 
-                return new IEvaluator() {
+                return new ICopyEvaluator() {
                     @SuppressWarnings("unchecked")
                     private ISerializerDeserializer<ABoolean> booleanSerde = AqlSerializerDeserializerProvider.INSTANCE
                             .getSerializerDeserializer(BuiltinType.ABOOLEAN);
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/OrderedListConstructorDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/OrderedListConstructorDescriptor.java
index 5b327ca..b9e341d 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/OrderedListConstructorDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/OrderedListConstructorDescriptor.java
@@ -12,8 +12,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 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;
@@ -41,20 +41,20 @@
     }
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) {
         return new OrderedListConstructorEvaluatorFactory(args, oltype);
     }
 
-    private static class OrderedListConstructorEvaluatorFactory implements IEvaluatorFactory {
+    private static class OrderedListConstructorEvaluatorFactory implements ICopyEvaluatorFactory {
 
         private static final long serialVersionUID = 1L;
-        private IEvaluatorFactory[] args;
+        private ICopyEvaluatorFactory[] args;
 
         private boolean selfDescList = false;
 
         private AOrderedListType orderedlistType;
 
-        public OrderedListConstructorEvaluatorFactory(IEvaluatorFactory[] args, AOrderedListType type) {
+        public OrderedListConstructorEvaluatorFactory(ICopyEvaluatorFactory[] args, AOrderedListType type) {
             this.args = args;
 
             this.orderedlistType = type;
@@ -64,15 +64,15 @@
         }
 
         @Override
-        public IEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
+        public ICopyEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
             final DataOutput out = output.getDataOutput();
             final ArrayBackedValueStorage inputVal = new ArrayBackedValueStorage();
-            final IEvaluator[] argEvals = new IEvaluator[args.length];
+            final ICopyEvaluator[] argEvals = new ICopyEvaluator[args.length];
             for (int i = 0; i < args.length; i++) {
                 argEvals[i] = args[i].createEvaluator(inputVal);
             }
 
-            return new IEvaluator() {
+            return new ICopyEvaluator() {
 
                 private OrderedListBuilder builder = new OrderedListBuilder();
 
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/PrefixLenDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/PrefixLenDescriptor.java
index 3e70f3c..57b7acd 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/PrefixLenDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/PrefixLenDescriptor.java
@@ -16,8 +16,8 @@
 import edu.uci.ics.fuzzyjoin.similarity.SimilarityFilters;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -36,21 +36,21 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
 
-        return new IEvaluatorFactory() {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
 
-                return new IEvaluator() {
+                return new ICopyEvaluator() {
 
                     private final DataOutput out = output.getDataOutput();
                     private final ArrayBackedValueStorage inputVal = new ArrayBackedValueStorage();
-                    private final IEvaluator evalLen = args[0].createEvaluator(inputVal);
-                    private final IEvaluator evalSimilarity = args[1].createEvaluator(inputVal);
-                    private final IEvaluator evalThreshold = args[2].createEvaluator(inputVal);
+                    private final ICopyEvaluator evalLen = args[0].createEvaluator(inputVal);
+                    private final ICopyEvaluator evalSimilarity = args[1].createEvaluator(inputVal);
+                    private final ICopyEvaluator evalThreshold = args[2].createEvaluator(inputVal);
 
                     private final SimilarityFiltersCache similarityFiltersCache = new SimilarityFiltersCache();
 
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/PrefixLenJaccardDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/PrefixLenJaccardDescriptor.java
index 8021c2d..2612583 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/PrefixLenJaccardDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/PrefixLenJaccardDescriptor.java
@@ -15,8 +15,8 @@
 import edu.uci.ics.fuzzyjoin.similarity.SimilarityFiltersJaccard;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -35,20 +35,20 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
 
-        return new IEvaluatorFactory() {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
 
-                return new IEvaluator() {
+                return new ICopyEvaluator() {
 
                     private final DataOutput out = output.getDataOutput();
                     private final ArrayBackedValueStorage inputVal = new ArrayBackedValueStorage();
-                    private final IEvaluator evalLen = args[0].createEvaluator(inputVal);
-                    private final IEvaluator evalThreshold = args[1].createEvaluator(inputVal);
+                    private final ICopyEvaluator evalLen = args[0].createEvaluator(inputVal);
+                    private final ICopyEvaluator evalThreshold = args[1].createEvaluator(inputVal);
 
                     private float similarityThresholdCache;
                     private SimilarityFiltersJaccard similarityFilters;
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/RegExpDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/RegExpDescriptor.java
index 596439e..1815085 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/RegExpDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/RegExpDescriptor.java
@@ -20,8 +20,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparator;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
@@ -53,22 +53,22 @@
     }
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
 
-        return new IEvaluatorFactory() {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
 
                 final DataOutput dout = output.getDataOutput();
 
-                return new IEvaluator() {
+                return new ICopyEvaluator() {
 
                     private boolean first = true;
                     private ArrayBackedValueStorage array0 = new ArrayBackedValueStorage();
-                    private IEvaluator evalString = args[0].createEvaluator(array0);
-                    private IEvaluator evalPattern = args[1].createEvaluator(array0);
+                    private ICopyEvaluator evalString = args[0].createEvaluator(array0);
+                    private ICopyEvaluator evalPattern = args[1].createEvaluator(array0);
                     private ByteArrayAccessibleOutputStream lastPattern = new ByteArrayAccessibleOutputStream();
                     private UTF8CharSequence carSeq = new UTF8CharSequence();
                     private IBinaryComparator strComp = AqlBinaryComparatorFactoryProvider.INSTANCE
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SimilarityDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SimilarityDescriptor.java
index 90788a6..d3218ff 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SimilarityDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SimilarityDescriptor.java
@@ -24,8 +24,8 @@
 import edu.uci.ics.fuzzyjoin.similarity.SimilarityMetric;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -47,25 +47,25 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
 
-        return new IEvaluatorFactory() {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
 
-                return new IEvaluator() {
+                return new ICopyEvaluator() {
 
                     private final DataOutput out = output.getDataOutput();
                     private final ArrayBackedValueStorage inputVal = new ArrayBackedValueStorage();
-                    private final IEvaluator evalLen1 = args[0].createEvaluator(inputVal);
-                    private final IEvaluator evalTokens1 = args[1].createEvaluator(inputVal);
-                    private final IEvaluator evalLen2 = args[2].createEvaluator(inputVal);
-                    private final IEvaluator evalTokens2 = args[3].createEvaluator(inputVal);
-                    private final IEvaluator evalTokenPrefix = args[4].createEvaluator(inputVal);
-                    private final IEvaluator evalSimilarity = args[5].createEvaluator(inputVal);
-                    private final IEvaluator evalThreshold = args[6].createEvaluator(inputVal);
+                    private final ICopyEvaluator evalLen1 = args[0].createEvaluator(inputVal);
+                    private final ICopyEvaluator evalTokens1 = args[1].createEvaluator(inputVal);
+                    private final ICopyEvaluator evalLen2 = args[2].createEvaluator(inputVal);
+                    private final ICopyEvaluator evalTokens2 = args[3].createEvaluator(inputVal);
+                    private final ICopyEvaluator evalTokenPrefix = args[4].createEvaluator(inputVal);
+                    private final ICopyEvaluator evalSimilarity = args[5].createEvaluator(inputVal);
+                    private final ICopyEvaluator evalThreshold = args[6].createEvaluator(inputVal);
 
                     private final SimilarityFiltersCache similarityFiltersCache = new SimilarityFiltersCache();
 
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SimilarityJaccardCheckDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SimilarityJaccardCheckDescriptor.java
index 971bfee..296916d 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SimilarityJaccardCheckDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SimilarityJaccardCheckDescriptor.java
@@ -17,8 +17,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.common.SimilarityJaccardEvaluator;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -38,12 +38,12 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
                 return new SimilarityJaccardCheckEvaluator(args, output);
             }
         };
@@ -56,7 +56,7 @@
 
     private static class SimilarityJaccardCheckEvaluator extends SimilarityJaccardEvaluator {
 
-        private final IEvaluator jaccThreshEval;
+        private final ICopyEvaluator jaccThreshEval;
         private float jaccThresh = -1f;
 
         private IAOrderedListBuilder listBuilder;
@@ -66,7 +66,7 @@
                 .getSerializerDeserializer(BuiltinType.ABOOLEAN);
         private final AOrderedListType listType = new AOrderedListType(BuiltinType.ANY, "list");
 
-        public SimilarityJaccardCheckEvaluator(IEvaluatorFactory[] args, IDataOutputProvider output)
+        public SimilarityJaccardCheckEvaluator(ICopyEvaluatorFactory[] args, IDataOutputProvider output)
                 throws AlgebricksException {
             super(args, output);
             jaccThreshEval = args[2].createEvaluator(argOut);
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SimilarityJaccardDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SimilarityJaccardDescriptor.java
index eb7fe6d..c3c6ca0 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SimilarityJaccardDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SimilarityJaccardDescriptor.java
@@ -7,8 +7,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.common.SimilarityJaccardEvaluator;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
 
 //assumes that both arguments are sorted by the same ordering
@@ -25,12 +25,12 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
                 return new SimilarityJaccardEvaluator(args, output);
             }
         };
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SimilarityJaccardPrefixCheckDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SimilarityJaccardPrefixCheckDescriptor.java
index f1af62a..4008419 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SimilarityJaccardPrefixCheckDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SimilarityJaccardPrefixCheckDescriptor.java
@@ -17,8 +17,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.common.SimilarityJaccardPrefixEvaluator;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -36,12 +36,12 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
                 return new SimilarityJaccardPrefixCheckEvaluator(args, output);
             }
         };
@@ -66,7 +66,7 @@
 
         private final AOrderedListType listType = new AOrderedListType(BuiltinType.ANY, "list");
 
-        public SimilarityJaccardPrefixCheckEvaluator(IEvaluatorFactory[] args, IDataOutputProvider output)
+        public SimilarityJaccardPrefixCheckEvaluator(ICopyEvaluatorFactory[] args, IDataOutputProvider output)
                 throws AlgebricksException {
             super(args, output);
             listBuilder = new OrderedListBuilder();
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SimilarityJaccardPrefixDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SimilarityJaccardPrefixDescriptor.java
index 62e1b06..4d9c528 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SimilarityJaccardPrefixDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SimilarityJaccardPrefixDescriptor.java
@@ -7,8 +7,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.common.SimilarityJaccardPrefixEvaluator;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
 
 public class SimilarityJaccardPrefixDescriptor extends AbstractScalarFunctionDynamicDescriptor {
@@ -23,12 +23,12 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
                 return new SimilarityJaccardPrefixEvaluator(args, output);
             }
         };
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SpatialAreaDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SpatialAreaDescriptor.java
index 7736fa7..644e89d 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SpatialAreaDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SpatialAreaDescriptor.java
@@ -18,8 +18,8 @@
 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.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 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;
@@ -37,17 +37,17 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-                return new IEvaluator() {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+                return new ICopyEvaluator() {
 
                     private DataOutput out = output.getDataOutput();
                     private ArrayBackedValueStorage argOut = new ArrayBackedValueStorage();
-                    private IEvaluator eval = args[0].createEvaluator(argOut);
+                    private ICopyEvaluator eval = args[0].createEvaluator(argOut);
 
                     @Override
                     public void evaluate(IFrameTupleReference tuple) throws AlgebricksException {
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SpatialCellDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SpatialCellDescriptor.java
index 5182ee8..0fe63f5 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SpatialCellDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SpatialCellDescriptor.java
@@ -20,8 +20,8 @@
 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.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -39,13 +39,13 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-                return new IEvaluator() {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+                return new ICopyEvaluator() {
 
                     private DataOutput out = output.getDataOutput();
 
@@ -53,10 +53,10 @@
                     private ArrayBackedValueStorage outInput1 = new ArrayBackedValueStorage();
                     private ArrayBackedValueStorage outInput2 = new ArrayBackedValueStorage();
                     private ArrayBackedValueStorage outInput3 = new ArrayBackedValueStorage();
-                    private IEvaluator eval0 = args[0].createEvaluator(outInput0);
-                    private IEvaluator eval1 = args[1].createEvaluator(outInput1);
-                    private IEvaluator eval2 = args[2].createEvaluator(outInput2);
-                    private IEvaluator eval3 = args[3].createEvaluator(outInput3);
+                    private ICopyEvaluator eval0 = args[0].createEvaluator(outInput0);
+                    private ICopyEvaluator eval1 = args[1].createEvaluator(outInput1);
+                    private ICopyEvaluator eval2 = args[2].createEvaluator(outInput2);
+                    private ICopyEvaluator eval3 = args[3].createEvaluator(outInput3);
                     private AMutableRectangle aRectangle = new AMutableRectangle(null, null);
                     private AMutablePoint[] aPoint = { new AMutablePoint(0, 0), new AMutablePoint(0, 0) };
                     @SuppressWarnings("unchecked")
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SpatialDistanceDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SpatialDistanceDescriptor.java
index 3a474ca..97e70b2 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SpatialDistanceDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SpatialDistanceDescriptor.java
@@ -15,8 +15,8 @@
 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.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 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;
@@ -34,19 +34,19 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-                return new IEvaluator() {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+                return new ICopyEvaluator() {
 
                     private DataOutput out = output.getDataOutput();
                     private ArrayBackedValueStorage outInput0 = new ArrayBackedValueStorage();
                     private ArrayBackedValueStorage outInput1 = new ArrayBackedValueStorage();
-                    private IEvaluator eval0 = args[0].createEvaluator(outInput0);
-                    private IEvaluator eval1 = args[1].createEvaluator(outInput1);
+                    private ICopyEvaluator eval0 = args[0].createEvaluator(outInput0);
+                    private ICopyEvaluator eval1 = args[1].createEvaluator(outInput1);
 
                     @Override
                     public void evaluate(IFrameTupleReference tuple) throws AlgebricksException {
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SpatialIntersectDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SpatialIntersectDescriptor.java
index 07eeb10..be31eed 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SpatialIntersectDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SpatialIntersectDescriptor.java
@@ -25,8 +25,8 @@
 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.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparator;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
@@ -45,19 +45,19 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-                return new IEvaluator() {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+                return new ICopyEvaluator() {
 
                     private final DataOutput out = output.getDataOutput();
                     private final ArrayBackedValueStorage outInput0 = new ArrayBackedValueStorage();
                     private final ArrayBackedValueStorage outInput1 = new ArrayBackedValueStorage();
-                    private final IEvaluator eval0 = args[0].createEvaluator(outInput0);
-                    private final IEvaluator eval1 = args[1].createEvaluator(outInput1);
+                    private final ICopyEvaluator eval0 = args[0].createEvaluator(outInput0);
+                    private final ICopyEvaluator eval1 = args[1].createEvaluator(outInput1);
                     private final IBinaryComparator ascDoubleComp = AqlBinaryComparatorFactoryProvider.DOUBLE_POINTABLE_INSTANCE
                             .createBinaryComparator();
                     private final SpatialUtils spatialUtils = new SpatialUtils();
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/StartsWithDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/StartsWithDescriptor.java
index 2896e5a..af2fc8d 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/StartsWithDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/StartsWithDescriptor.java
@@ -8,8 +8,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.data.std.primitive.UTF8StringPointable;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
 
@@ -25,13 +25,13 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
 
-        return new IEvaluatorFactory() {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
 
                 DataOutput dout = output.getDataOutput();
 
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SubstringDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SubstringDescriptor.java
index 8f3ca50..6eb0c76 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SubstringDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SubstringDescriptor.java
@@ -10,8 +10,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.data.std.primitive.UTF8StringPointable;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
@@ -30,19 +30,19 @@
     };
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
-                return new IEvaluator() {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+                return new ICopyEvaluator() {
 
                     private DataOutput out = output.getDataOutput();
                     private ArrayBackedValueStorage argOut = new ArrayBackedValueStorage();
-                    private IEvaluator evalString = args[0].createEvaluator(argOut);
-                    private IEvaluator evalStart = args[1].createEvaluator(argOut);
-                    private IEvaluator evalLen = args[2].createEvaluator(argOut);
+                    private ICopyEvaluator evalString = args[0].createEvaluator(argOut);
+                    private ICopyEvaluator evalStart = args[1].createEvaluator(argOut);
+                    private ICopyEvaluator evalLen = args[2].createEvaluator(argOut);
                     private final byte stt = ATypeTag.STRING.serialize();
 
                     @Override
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SwitchCaseDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SwitchCaseDescriptor.java
index 93ad6fb..29fbb7f 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SwitchCaseDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/SwitchCaseDescriptor.java
@@ -8,8 +8,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 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;
@@ -32,18 +32,18 @@
     }
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
 
-        return new IEvaluatorFactory() {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException {
                 final ArrayBackedValueStorage condOut = new ArrayBackedValueStorage();
                 final ArrayBackedValueStorage caseOut = new ArrayBackedValueStorage();
                 final ArrayBackedValueStorage argOut = new ArrayBackedValueStorage();
 
-                final IEvaluator[] evals = new IEvaluator[args.length];
+                final ICopyEvaluator[] evals = new ICopyEvaluator[args.length];
                 // condition
                 evals[0] = args[0].createEvaluator(condOut);
                 // case value
@@ -57,7 +57,7 @@
                 // default expression
                 evals[evals.length - 1] = args[evals.length - 1].createEvaluator(argOut);
 
-                return new IEvaluator() {
+                return new ICopyEvaluator() {
 
                     @Override
                     public void evaluate(IFrameTupleReference tuple) throws AlgebricksException {
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/UnorderedListConstructorDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/UnorderedListConstructorDescriptor.java
index f49ef3c..ea0765e 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/UnorderedListConstructorDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/UnorderedListConstructorDescriptor.java
@@ -12,8 +12,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 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;
@@ -41,20 +41,20 @@
     }
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) {
         return new UnorderedListConstructorEvaluatorFactory(args, ultype);
     }
 
-    private static class UnorderedListConstructorEvaluatorFactory implements IEvaluatorFactory {
+    private static class UnorderedListConstructorEvaluatorFactory implements ICopyEvaluatorFactory {
 
         private static final long serialVersionUID = 1L;
-        private IEvaluatorFactory[] args;
+        private ICopyEvaluatorFactory[] args;
 
         private boolean selfDescList = false;
         private boolean homoList = false;
         private AUnorderedListType unorderedlistType;
 
-        public UnorderedListConstructorEvaluatorFactory(IEvaluatorFactory[] args, AUnorderedListType type) {
+        public UnorderedListConstructorEvaluatorFactory(ICopyEvaluatorFactory[] args, AUnorderedListType type) {
             this.args = args;
             this.unorderedlistType = type;
             if (type == null || type.getItemType() == null || type.getItemType().getTypeTag() == ATypeTag.ANY)
@@ -64,15 +64,15 @@
         }
 
         @Override
-        public IEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
+        public ICopyEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
             final DataOutput out = output.getDataOutput();
             final ArrayBackedValueStorage inputVal = new ArrayBackedValueStorage();
-            final IEvaluator[] argEvals = new IEvaluator[args.length];
+            final ICopyEvaluator[] argEvals = new ICopyEvaluator[args.length];
             for (int i = 0; i < args.length; i++) {
                 argEvals[i] = args[i].createEvaluator(inputVal);
             }
 
-            return new IEvaluator() {
+            return new ICopyEvaluator() {
 
                 private UnorderedListBuilder builder = new UnorderedListBuilder();
 
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/WordTokensDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/WordTokensDescriptor.java
index ab659fc..75a211f 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/WordTokensDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/WordTokensDescriptor.java
@@ -13,8 +13,8 @@
 import edu.uci.ics.fuzzyjoin.tokenizer.UTF8WordTokenFactory;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider;
 
 public class WordTokensDescriptor extends AbstractScalarFunctionDynamicDescriptor {
@@ -34,12 +34,12 @@
     }
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) throws AlgebricksException {
-        return new IEvaluatorFactory() {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) throws AlgebricksException {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
                 ITokenFactory tokenFactory = new UTF8WordTokenFactory(ATypeTag.STRING.serialize(),
                         ATypeTag.INT32.serialize());
                 IBinaryTokenizer tokenizer = new DelimitedUTF8StringBinaryTokenizer(true, true, tokenFactory);
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/YearDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/YearDescriptor.java
index 03a5ddc..b95fbfa 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/YearDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/functions/YearDescriptor.java
@@ -15,8 +15,8 @@
 import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.data.std.primitive.UTF8StringPointable;
@@ -47,18 +47,18 @@
      */
 
     @Override
-    public IEvaluatorFactory createEvaluatorFactory(final IEvaluatorFactory[] args) {
+    public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) {
 
-        return new IEvaluatorFactory() {
+        return new ICopyEvaluatorFactory() {
             private static final long serialVersionUID = 1L;
 
             @Override
-            public IEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
+            public ICopyEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
                 final DataOutput out = output.getDataOutput();
 
-                return new IEvaluator() {
+                return new ICopyEvaluator() {
                     private ArrayBackedValueStorage out1 = new ArrayBackedValueStorage();
-                    private IEvaluator eval1 = args[0].createEvaluator(out1);
+                    private ICopyEvaluator eval1 = args[0].createEvaluator(out1);
                     private AMutableInt32 m = new AMutableInt32(0);
                     @SuppressWarnings("unchecked")
                     private ISerializerDeserializer<AInt32> int32Serde = AqlSerializerDeserializerProvider.INSTANCE
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/formats/NonTaggedDataFormat.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/formats/NonTaggedDataFormat.java
index efff2cd..e16b384 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/formats/NonTaggedDataFormat.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/formats/NonTaggedDataFormat.java
@@ -159,7 +159,7 @@
 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.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.algebricks.runtime.evaluators.ColumnAccessEvalFactory;
 import edu.uci.ics.hyracks.algebricks.runtime.evaluators.ConstantEvalFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.INullWriterFactory;
@@ -350,13 +350,13 @@
 
     @SuppressWarnings("unchecked")
     @Override
-    public IEvaluatorFactory getFieldAccessEvaluatorFactory(ARecordType recType, String fldName, int recordColumn)
+    public ICopyEvaluatorFactory getFieldAccessEvaluatorFactory(ARecordType recType, String fldName, int recordColumn)
             throws AlgebricksException {
         String[] names = recType.getFieldNames();
         int n = names.length;
         for (int i = 0; i < n; i++) {
             if (names[i].equals(fldName)) {
-                IEvaluatorFactory recordEvalFactory = new ColumnAccessEvalFactory(recordColumn);
+                ICopyEvaluatorFactory recordEvalFactory = new ColumnAccessEvalFactory(recordColumn);
                 ArrayBackedValueStorage abvs = new ArrayBackedValueStorage();
                 DataOutput dos = abvs.getDataOutput();
                 try {
@@ -366,9 +366,9 @@
                 } catch (HyracksDataException e) {
                     throw new AlgebricksException(e);
                 }
-                IEvaluatorFactory fldIndexEvalFactory = new ConstantEvalFactory(Arrays.copyOf(abvs.getByteArray(),
+                ICopyEvaluatorFactory fldIndexEvalFactory = new ConstantEvalFactory(Arrays.copyOf(abvs.getByteArray(),
                         abvs.getLength()));
-                IEvaluatorFactory evalFactory = new FieldAccessByIndexEvalFactory(recordEvalFactory,
+                ICopyEvaluatorFactory evalFactory = new FieldAccessByIndexEvalFactory(recordEvalFactory,
                         fldIndexEvalFactory, recType);
                 return evalFactory;
             }
@@ -378,11 +378,11 @@
 
     @SuppressWarnings("unchecked")
     @Override
-    public IEvaluatorFactory[] createMBRFactory(ARecordType recType, String fldName, int recordColumn, int dimension)
+    public ICopyEvaluatorFactory[] createMBRFactory(ARecordType recType, String fldName, int recordColumn, int dimension)
             throws AlgebricksException {
-        IEvaluatorFactory evalFactory = getFieldAccessEvaluatorFactory(recType, fldName, recordColumn);
+        ICopyEvaluatorFactory evalFactory = getFieldAccessEvaluatorFactory(recType, fldName, recordColumn);
         int numOfFields = dimension * 2;
-        IEvaluatorFactory[] evalFactories = new IEvaluatorFactory[numOfFields];
+        ICopyEvaluatorFactory[] evalFactories = new ICopyEvaluatorFactory[numOfFields];
 
         ArrayBackedValueStorage abvs1 = new ArrayBackedValueStorage();
         DataOutput dos1 = abvs1.getDataOutput();
@@ -392,7 +392,7 @@
         } catch (HyracksDataException e) {
             throw new AlgebricksException(e);
         }
-        IEvaluatorFactory dimensionEvalFactory = new ConstantEvalFactory(Arrays.copyOf(abvs1.getByteArray(),
+        ICopyEvaluatorFactory dimensionEvalFactory = new ConstantEvalFactory(Arrays.copyOf(abvs1.getByteArray(),
                 abvs1.getLength()));
 
         for (int i = 0; i < numOfFields; i++) {
@@ -404,7 +404,7 @@
             } catch (HyracksDataException e) {
                 throw new AlgebricksException(e);
             }
-            IEvaluatorFactory coordinateEvalFactory = new ConstantEvalFactory(Arrays.copyOf(abvs2.getByteArray(),
+            ICopyEvaluatorFactory coordinateEvalFactory = new ConstantEvalFactory(Arrays.copyOf(abvs2.getByteArray(),
                     abvs2.getLength()));
 
             evalFactories[i] = new CreateMBREvalFactory(evalFactory, dimensionEvalFactory, coordinateEvalFactory);
@@ -414,13 +414,13 @@
 
     @SuppressWarnings("unchecked")
     @Override
-    public Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType> partitioningEvaluatorFactory(
+    public Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType> partitioningEvaluatorFactory(
             ARecordType recType, String fldName) throws AlgebricksException {
         String[] names = recType.getFieldNames();
         int n = names.length;
         for (int i = 0; i < n; i++) {
             if (names[i].equals(fldName)) {
-                IEvaluatorFactory recordEvalFactory = new ColumnAccessEvalFactory(
+                ICopyEvaluatorFactory recordEvalFactory = new ColumnAccessEvalFactory(
                         GlobalConfig.DEFAULT_INPUT_DATA_COLUMN);
                 ArrayBackedValueStorage abvs = new ArrayBackedValueStorage();
                 DataOutput dos = abvs.getDataOutput();
@@ -431,9 +431,9 @@
                 } catch (HyracksDataException e) {
                     throw new AlgebricksException(e);
                 }
-                IEvaluatorFactory fldIndexEvalFactory = new ConstantEvalFactory(Arrays.copyOf(abvs.getByteArray(),
+                ICopyEvaluatorFactory fldIndexEvalFactory = new ConstantEvalFactory(Arrays.copyOf(abvs.getByteArray(),
                         abvs.getLength()));
-                IEvaluatorFactory evalFactory = new FieldAccessByIndexEvalFactory(recordEvalFactory,
+                ICopyEvaluatorFactory evalFactory = new FieldAccessByIndexEvalFactory(recordEvalFactory,
                         fldIndexEvalFactory, recType);
                 IFunctionInfo finfoAccess = AsterixBuiltinFunctions
                         .getAsterixFunctionInfo(AsterixBuiltinFunctions.FIELD_ACCESS_BY_INDEX);
@@ -442,7 +442,7 @@
                         new MutableObject<ILogicalExpression>(new VariableReferenceExpression(METADATA_DUMMY_VAR)),
                         new MutableObject<ILogicalExpression>(new ConstantExpression(new AsterixConstantValue(
                                 new AInt32(i)))));
-                return new Triple<IEvaluatorFactory, ScalarFunctionCallExpression, IAType>(evalFactory, partitionFun,
+                return new Triple<ICopyEvaluatorFactory, ScalarFunctionCallExpression, IAType>(evalFactory, partitionFun,
                         recType.getFieldTypes()[i]);
             }
         }
@@ -550,7 +550,7 @@
 
     @SuppressWarnings("unchecked")
     @Override
-    public IEvaluatorFactory getConstantEvalFactory(IAlgebricksConstantValue value) throws AlgebricksException {
+    public ICopyEvaluatorFactory getConstantEvalFactory(IAlgebricksConstantValue value) throws AlgebricksException {
         IAObject obj = null;
         if (value.isNull()) {
             obj = ANull.NULL;
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/runningaggregates/std/TidRunningAggregateDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/runningaggregates/std/TidRunningAggregateDescriptor.java
index bbebe50..e8473b2 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/runningaggregates/std/TidRunningAggregateDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/runningaggregates/std/TidRunningAggregateDescriptor.java
@@ -12,7 +12,7 @@
 import edu.uci.ics.asterix.runtime.runningaggregates.base.AbstractRunningAggregateFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-import edu.uci.ics.hyracks.algebricks.runtime.base.IEvaluatorFactory;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.algebricks.runtime.base.IRunningAggregateFunction;
 import edu.uci.ics.hyracks.algebricks.runtime.base.IRunningAggregateFunctionFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
@@ -31,7 +31,7 @@
     };
     
     @Override
-    public IRunningAggregateFunctionFactory createRunningAggregateFunctionFactory(IEvaluatorFactory[] args)
+    public IRunningAggregateFunctionFactory createRunningAggregateFunctionFactory(ICopyEvaluatorFactory[] args)
             throws AlgebricksException {
 
         return new IRunningAggregateFunctionFactory() {
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/unnestingfunctions/std/RangeDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/unnestingfunctions/std/RangeDescriptor.java
index 9ca7596..a4ed1d8 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/unnestingfunctions/std/RangeDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/unnestingfunctions/std/RangeDescriptor.java
@@ -11,8 +11,8 @@
 import edu.uci.ics.asterix.runtime.unnestingfunctions.base.AbstractUnnestingFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.algebricks.runtime.base.IUnnestingFunction;
 import edu.uci.ics.hyracks.algebricks.runtime.base.IUnnestingFunctionFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
@@ -39,7 +39,7 @@
     }
 
     @Override
-    public IUnnestingFunctionFactory createUnnestingFunctionFactory(final IEvaluatorFactory[] args)
+    public IUnnestingFunctionFactory createUnnestingFunctionFactory(final ICopyEvaluatorFactory[] args)
             throws AlgebricksException {
         return new IUnnestingFunctionFactory() {
 
@@ -55,8 +55,8 @@
                     private ISerializerDeserializer serde = AqlSerializerDeserializerProvider.INSTANCE
                             .getSerializerDeserializer(BuiltinType.AINT32);
                     private ArrayBackedValueStorage inputVal = new ArrayBackedValueStorage();
-                    private IEvaluator eval0 = args[0].createEvaluator(inputVal);
-                    private IEvaluator eval1 = args[1].createEvaluator(inputVal);
+                    private ICopyEvaluator eval0 = args[0].createEvaluator(inputVal);
+                    private ICopyEvaluator eval1 = args[1].createEvaluator(inputVal);
                     private AMutableInt32 aInt32 = new AMutableInt32(0);
                     private int current;
                     private int max;
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/unnestingfunctions/std/ScanCollectionDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/unnestingfunctions/std/ScanCollectionDescriptor.java
index d59d6c4..569d19f 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/unnestingfunctions/std/ScanCollectionDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/unnestingfunctions/std/ScanCollectionDescriptor.java
@@ -18,8 +18,8 @@
 import edu.uci.ics.asterix.runtime.unnestingfunctions.base.AbstractUnnestingFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.algebricks.runtime.base.IUnnestingFunction;
 import edu.uci.ics.hyracks.algebricks.runtime.base.IUnnestingFunctionFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
@@ -44,7 +44,7 @@
     }
 
     @Override
-    public IUnnestingFunctionFactory createUnnestingFunctionFactory(final IEvaluatorFactory[] args) {
+    public IUnnestingFunctionFactory createUnnestingFunctionFactory(final ICopyEvaluatorFactory[] args) {
         return new ScanCollectionUnnestingFunctionFactory(args[0]);
     }
 
@@ -52,7 +52,7 @@
 
         private static final long serialVersionUID = 1L;
 
-        private IEvaluatorFactory listEvalFactory;
+        private ICopyEvaluatorFactory listEvalFactory;
         private final static byte SER_ORDEREDLIST_TYPE_TAG = ATypeTag.ORDEREDLIST.serialize();
         private final static byte SER_UNORDEREDLIST_TYPE_TAG = ATypeTag.UNORDEREDLIST.serialize();
         private final static byte SER_NULL_TYPE_TAG = ATypeTag.NULL.serialize();
@@ -60,7 +60,7 @@
         private byte serItemTypeTag;
         private boolean selfDescList = false;
 
-        public ScanCollectionUnnestingFunctionFactory(IEvaluatorFactory arg) {
+        public ScanCollectionUnnestingFunctionFactory(ICopyEvaluatorFactory arg) {
             this.listEvalFactory = arg;
         }
 
@@ -72,7 +72,7 @@
             return new IUnnestingFunction() {
 
                 private ArrayBackedValueStorage inputVal = new ArrayBackedValueStorage();
-                private IEvaluator argEval = listEvalFactory.createEvaluator(inputVal);
+                private ICopyEvaluator argEval = listEvalFactory.createEvaluator(inputVal);
                 @SuppressWarnings("unchecked")
                 private ISerializerDeserializer<ANull> nullSerde = AqlSerializerDeserializerProvider.INSTANCE
                         .getSerializerDeserializer(BuiltinType.ANULL);
diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/unnestingfunctions/std/SubsetCollectionDescriptor.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/unnestingfunctions/std/SubsetCollectionDescriptor.java
index 6214d27..7212176 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/unnestingfunctions/std/SubsetCollectionDescriptor.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/unnestingfunctions/std/SubsetCollectionDescriptor.java
@@ -18,8 +18,8 @@
 import edu.uci.ics.asterix.runtime.unnestingfunctions.base.AbstractUnnestingFunctionDynamicDescriptor;
 import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
 import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
-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.base.ICopyEvaluator;
+import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
 import edu.uci.ics.hyracks.algebricks.runtime.base.IUnnestingFunction;
 import edu.uci.ics.hyracks.algebricks.runtime.base.IUnnestingFunctionFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
@@ -45,7 +45,7 @@
     };
 
     @Override
-    public IUnnestingFunctionFactory createUnnestingFunctionFactory(final IEvaluatorFactory[] args)
+    public IUnnestingFunctionFactory createUnnestingFunctionFactory(final ICopyEvaluatorFactory[] args)
             throws AlgebricksException {
         return new IUnnestingFunctionFactory() {
             private static final long serialVersionUID = 1L;
@@ -60,9 +60,9 @@
                     private ISerializerDeserializer<ANull> nullSerde = AqlSerializerDeserializerProvider.INSTANCE
                             .getSerializerDeserializer(BuiltinType.ANULL);
                     private ArrayBackedValueStorage inputVal = new ArrayBackedValueStorage();
-                    private IEvaluator evalList = args[0].createEvaluator(inputVal);
-                    private IEvaluator evalStart = args[1].createEvaluator(inputVal);
-                    private IEvaluator evalLen = args[2].createEvaluator(inputVal);
+                    private ICopyEvaluator evalList = args[0].createEvaluator(inputVal);
+                    private ICopyEvaluator evalStart = args[1].createEvaluator(inputVal);
+                    private ICopyEvaluator evalLen = args[2].createEvaluator(inputVal);
                     private int numItems;
                     private int numItemsMax;
                     private int posStart;