diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/compiler/provider/DefaultRuleSetFactory.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/compiler/provider/DefaultRuleSetFactory.java
index 76404ff..67b7910 100644
--- a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/compiler/provider/DefaultRuleSetFactory.java
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/compiler/provider/DefaultRuleSetFactory.java
@@ -76,9 +76,10 @@
         defaultLogicalRewrites
                 .add(new Pair<>(seqCtrlNoDfs, RuleCollections.buildCondPushDownAndJoinInferenceRuleCollection()));
         defaultLogicalRewrites.add(new Pair<>(seqCtrlFullDfs, RuleCollections.buildLoadFieldsRuleCollection(appCtx)));
-        defaultLogicalRewrites.add(new Pair<>(seqOnceCtrl, RuleCollections.buildDataExchangeRuleCollection()));
-        defaultLogicalRewrites.add(new Pair<>(seqCtrlNoDfs, RuleCollections.buildConsolidationRuleCollection()));
         defaultLogicalRewrites.add(new Pair<>(seqOnceCtrl, RuleCollections.buildFulltextContainsRuleCollection()));
+        defaultLogicalRewrites.add(new Pair<>(seqOnceCtrl, RuleCollections.buildDataExchangeRuleCollection()));
+        defaultLogicalRewrites.add(new Pair<>(seqOnceCtrl, RuleCollections.buildCBORuleCollection()));
+        defaultLogicalRewrites.add(new Pair<>(seqCtrlNoDfs, RuleCollections.buildConsolidationRuleCollection()));
         defaultLogicalRewrites.add(new Pair<>(seqCtrlNoDfs, RuleCollections.buildAccessMethodRuleCollection()));
         defaultLogicalRewrites.add(new Pair<>(seqCtrlNoDfs, RuleCollections.buildPlanCleanupRuleCollection()));
 
diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/compiler/provider/SqlppCompilationProvider.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/compiler/provider/SqlppCompilationProvider.java
index 43963dc..7610092 100644
--- a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/compiler/provider/SqlppCompilationProvider.java
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/compiler/provider/SqlppCompilationProvider.java
@@ -83,12 +83,14 @@
                 CompilerProperties.COMPILER_INDEXONLY_KEY, CompilerProperties.COMPILER_INTERNAL_SANITYCHECK_KEY,
                 CompilerProperties.COMPILER_EXTERNAL_FIELD_PUSHDOWN_KEY, CompilerProperties.COMPILER_SUBPLAN_MERGE_KEY,
                 CompilerProperties.COMPILER_SUBPLAN_NESTEDPUSHDOWN_KEY, CompilerProperties.COMPILER_ARRAYINDEX_KEY,
+                CompilerProperties.COMPILER_CBO_KEY, CompilerProperties.COMPILER_CBO_TEST_KEY,
+                CompilerProperties.COMPILER_FORCE_JOIN_ORDER_KEY, CompilerProperties.COMPILER_QUERY_PLAN_SHAPE_KEY,
                 CompilerProperties.COMPILER_MIN_MEMORY_ALLOCATION_KEY, FunctionUtil.IMPORT_PRIVATE_FUNCTIONS,
                 FuzzyUtils.SIM_FUNCTION_PROP_NAME, FuzzyUtils.SIM_THRESHOLD_PROP_NAME,
                 StartFeedStatement.WAIT_FOR_COMPLETION, FeedActivityDetails.FEED_POLICY_NAME,
                 FeedActivityDetails.COLLECT_LOCATIONS, SqlppQueryRewriter.INLINE_WITH_OPTION,
                 SqlppExpressionToPlanTranslator.REWRITE_IN_AS_OR_OPTION, "hash_merge", "output-record-type",
-                DisjunctivePredicateToJoinRule.REWRITE_OR_AS_JOIN_OPTION,
+                "cardinality", DisjunctivePredicateToJoinRule.REWRITE_OR_AS_JOIN_OPTION,
                 SetAsterixPhysicalOperatorsRule.REWRITE_ATTEMPT_BATCH_ASSIGN,
                 EquivalenceClassUtils.REWRITE_INTERNAL_QUERYUID_PK, SqlppQueryRewriter.SQL_COMPAT_OPTION));
     }
diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/base/RuleCollections.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/base/RuleCollections.java
index 5493dd1..bebc4f2 100644
--- a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/base/RuleCollections.java
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/base/RuleCollections.java
@@ -26,6 +26,7 @@
 import org.apache.asterix.common.dataflow.ICcApplicationContext;
 import org.apache.asterix.om.functions.BuiltinFunctions;
 import org.apache.asterix.optimizer.rules.AddEquivalenceClassForRecordConstructorRule;
+import org.apache.asterix.optimizer.rules.AnnotateOperatorCostCardinalityRule;
 import org.apache.asterix.optimizer.rules.AsterixConsolidateWindowOperatorsRule;
 import org.apache.asterix.optimizer.rules.AsterixExtractFunctionsFromJoinConditionRule;
 import org.apache.asterix.optimizer.rules.AsterixInlineVariablesRule;
@@ -96,6 +97,8 @@
 import org.apache.asterix.optimizer.rules.am.IntroduceLSMComponentFilterRule;
 import org.apache.asterix.optimizer.rules.am.IntroducePrimaryIndexForAggregationRule;
 import org.apache.asterix.optimizer.rules.am.IntroduceSelectAccessMethodRule;
+import org.apache.asterix.optimizer.rules.cbo.EnumerateJoinsRule;
+import org.apache.asterix.optimizer.rules.cbo.JoinEnum;
 import org.apache.asterix.optimizer.rules.subplan.AsterixMoveFreeVariableOperatorOutOfSubplanRule;
 import org.apache.asterix.optimizer.rules.subplan.InlineSubplanInputForNestedTupleSourceRule;
 import org.apache.asterix.optimizer.rules.temporal.TranslateIntervalExpressionRule;
@@ -354,6 +357,15 @@
         return dataExchange;
     }
 
+    public static final List<IAlgebraicRewriteRule> buildCBORuleCollection() {
+        List<IAlgebraicRewriteRule> cbo = new LinkedList<>();
+        cbo.add(new ConsolidateSelectsRule());
+        cbo.add(new EnumerateJoinsRule(new JoinEnum()));
+        cbo.add(new ReinferAllTypesRule());
+        cbo.add(new AsterixExtractFunctionsFromJoinConditionRule());
+        return cbo;
+    }
+
     public static final List<IAlgebraicRewriteRule> buildPhysicalRewritesAllLevelsRuleCollection() {
         List<IAlgebraicRewriteRule> physicalRewritesAllLevels = new LinkedList<>();
         physicalRewritesAllLevels.add(new PullSelectOutOfEqJoin());
@@ -420,6 +432,7 @@
         prepareForJobGenRewrites.add(new SweepIllegalNonfunctionalFunctions());
         prepareForJobGenRewrites.add(new FixReplicateOperatorOutputsRule());
         prepareForJobGenRewrites.add(new PopulateResultMetadataRule());
+        prepareForJobGenRewrites.add(new AnnotateOperatorCostCardinalityRule());
         return prepareForJobGenRewrites;
     }
 }
diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/cost/Cost.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/cost/Cost.java
new file mode 100644
index 0000000..7e74f91
--- /dev/null
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/cost/Cost.java
@@ -0,0 +1,99 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.asterix.optimizer.cost;
+
+public class Cost implements ICost {
+
+    public static final double MAX_CARD = 1.0e200;
+    protected static final int COST_GT = 1;
+    protected static final int COST_LT = -1;
+    protected static final int COST_EQ = 0;
+
+    private final double cost;
+
+    public Cost() {
+        this.cost = 0.0;
+    }
+
+    public Cost(double cost) {
+        this.cost = cost;
+    }
+
+    @Override
+    public Cost zeroCost() {
+        return new Cost();
+    }
+
+    @Override
+    public Cost maxCost() {
+        return new Cost(MAX_CARD);
+    }
+
+    @Override
+    public Cost costAdd(ICost iCost2) {
+        return new Cost(this.computeTotalCost() + iCost2.computeTotalCost());
+    }
+
+    @Override
+    public Cost costAdd(ICost iCost2, ICost iCost3) {
+        return this.costAdd(iCost2.costAdd(iCost3));
+    }
+
+    @Override
+    public int costCompare(ICost iCost2) {
+        if (this.computeTotalCost() > iCost2.computeTotalCost()) {
+            return COST_GT;
+        } else if (this.computeTotalCost() < iCost2.computeTotalCost()) {
+            return COST_LT;
+        } else {
+            return COST_EQ;
+        }
+    }
+
+    @Override
+    public boolean costEQ(ICost iCost2) {
+        return this.costCompare(iCost2) == COST_EQ;
+    }
+
+    @Override
+    public boolean costLT(ICost iCost2) {
+        return this.costCompare(iCost2) == COST_LT;
+    }
+
+    @Override
+    public boolean costGT(ICost iCost2) {
+        return this.costCompare(iCost2) == COST_GT;
+    }
+
+    @Override
+    public boolean costLE(ICost iCost2) {
+        return this.costLT(iCost2) || this.costEQ(iCost2);
+    }
+
+    @Override
+    public boolean costGE(ICost iCost2) {
+        return this.costGT(iCost2) || this.costEQ(iCost2);
+    }
+
+    @Override
+    public double computeTotalCost() {
+        return this.cost;
+    }
+}
diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/cost/CostMethods.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/cost/CostMethods.java
new file mode 100644
index 0000000..5dafa54
--- /dev/null
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/cost/CostMethods.java
@@ -0,0 +1,118 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.asterix.optimizer.cost;
+
+import org.apache.asterix.metadata.declared.MetadataProvider;
+import org.apache.asterix.optimizer.rules.cbo.JoinNode;
+import org.apache.hyracks.algebricks.core.algebra.base.IOptimizationContext;
+import org.apache.hyracks.algebricks.core.rewriter.base.PhysicalOptimizationConfig;
+
+public class CostMethods implements ICostMethods {
+
+    protected IOptimizationContext optCtx;
+    protected PhysicalOptimizationConfig physOptConfig;
+    protected long blockSize;
+    protected long DOP;
+    protected double maxMemorySize;
+
+    public CostMethods(IOptimizationContext context) {
+        optCtx = context;
+        physOptConfig = context.getPhysicalOptimizationConfig();
+        blockSize = getBufferCachePageSize();
+        DOP = getDOP();
+        maxMemorySize = getMaxMemorySize();
+    }
+
+    public long getBufferCacheSize() {
+        MetadataProvider metadataProvider = (MetadataProvider) optCtx.getMetadataProvider();
+        return metadataProvider.getStorageProperties().getBufferCacheSize();
+    }
+
+    public long getBufferCachePageSize() {
+        MetadataProvider metadataProvider = (MetadataProvider) optCtx.getMetadataProvider();
+        return metadataProvider.getStorageProperties().getBufferCachePageSize();
+    }
+
+    public long getDOP() {
+        return optCtx.getComputationNodeDomain().cardinality();
+    }
+
+    public double getMaxMemorySize() {
+        return physOptConfig.getMaxFramesForJoin() * physOptConfig.getFrameSize();
+    }
+
+    // These cost methods are very simple and rudimentary for now. These can be improved by asterixdb developers as needed.
+    public Cost costFullScan(JoinNode jn) {
+        return new Cost(jn.computeJoinCardinality());
+    }
+
+    public Cost costIndexScan(JoinNode jn) {
+        return new Cost(jn.computeJoinCardinality());
+    }
+
+    public Cost costHashJoin(JoinNode jn) {
+        JoinNode leftJn = jn.getLeftJn();
+        JoinNode rightJn = jn.getRightJn();
+        return new Cost(leftJn.computeJoinCardinality() + rightJn.computeJoinCardinality());
+    }
+
+    public Cost computeHJProbeExchangeCost(JoinNode jn) {
+        JoinNode leftJn = jn.getLeftJn();
+        return new Cost(leftJn.computeJoinCardinality());
+    }
+
+    public Cost computeHJBuildExchangeCost(JoinNode jn) {
+        JoinNode rightJn = jn.getRightJn();
+        return new Cost(rightJn.computeJoinCardinality());
+    }
+
+    public Cost costBroadcastHashJoin(JoinNode jn) {
+        JoinNode leftJn = jn.getLeftJn();
+        JoinNode rightJn = jn.getRightJn();
+        return new Cost(leftJn.computeJoinCardinality() + DOP * rightJn.computeJoinCardinality());
+    }
+
+    public Cost computeBHJBuildExchangeCost(JoinNode jn) {
+        JoinNode rightJn = jn.getRightJn();
+        return new Cost(DOP * rightJn.computeJoinCardinality());
+    }
+
+    public Cost costIndexNLJoin(JoinNode jn) {
+        JoinNode leftJn = jn.getLeftJn();
+        JoinNode rightJn = jn.getRightJn();
+        return new Cost(leftJn.computeJoinCardinality());
+    }
+
+    public Cost computeNLJOuterExchangeCost(JoinNode jn) {
+        JoinNode leftJn = jn.getLeftJn();
+        return new Cost(DOP * leftJn.computeJoinCardinality());
+    }
+
+    public Cost costCartesianProductJoin(JoinNode jn) {
+        JoinNode leftJn = jn.getLeftJn();
+        JoinNode rightJn = jn.getRightJn();
+        return new Cost(leftJn.computeJoinCardinality() * rightJn.computeJoinCardinality());
+    }
+
+    public Cost computeCPRightExchangeCost(JoinNode jn) {
+        JoinNode rightJn = jn.getRightJn();
+        return new Cost(DOP * rightJn.computeJoinCardinality());
+    }
+}
diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/cost/ICost.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/cost/ICost.java
new file mode 100644
index 0000000..6f4c7d7
--- /dev/null
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/cost/ICost.java
@@ -0,0 +1,45 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.asterix.optimizer.cost;
+
+public interface ICost {
+
+    ICost zeroCost();
+
+    ICost maxCost();
+
+    ICost costAdd(ICost cost2);
+
+    ICost costAdd(ICost cost2, ICost cost3);
+
+    int costCompare(ICost cost2);
+
+    boolean costEQ(ICost cost2);
+
+    boolean costLT(ICost cost2);
+
+    boolean costGT(ICost cost2);
+
+    boolean costLE(ICost cost2);
+
+    boolean costGE(ICost cost2);
+
+    double computeTotalCost();
+}
diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/cost/ICostMethods.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/cost/ICostMethods.java
new file mode 100644
index 0000000..47ef617
--- /dev/null
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/cost/ICostMethods.java
@@ -0,0 +1,36 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.asterix.optimizer.cost;
+
+import org.apache.asterix.optimizer.rules.cbo.JoinNode;
+
+public interface ICostMethods {
+    Cost costFullScan(JoinNode jn);
+
+    Cost costIndexScan(JoinNode jn);
+
+    Cost costHashJoin(JoinNode currentJn);
+
+    Cost costBroadcastHashJoin(JoinNode currentJn);
+
+    Cost costIndexNLJoin(JoinNode currentJn);
+
+    Cost costCartesianProductJoin(JoinNode currentJn);
+}
diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/AnnotateOperatorCostCardinalityRule.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/AnnotateOperatorCostCardinalityRule.java
new file mode 100644
index 0000000..b253a1d
--- /dev/null
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/AnnotateOperatorCostCardinalityRule.java
@@ -0,0 +1,55 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.asterix.optimizer.rules;
+
+import org.apache.asterix.optimizer.rules.cbo.EstimatedCostComputationVisitor;
+import org.apache.commons.lang3.mutable.Mutable;
+import org.apache.hyracks.algebricks.common.exceptions.AlgebricksException;
+import org.apache.hyracks.algebricks.core.algebra.base.ILogicalOperator;
+import org.apache.hyracks.algebricks.core.algebra.base.IOptimizationContext;
+import org.apache.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
+
+/**
+ * This rule annotates the operators with their estimated cardinality and estimated cost.
+ */
+public class AnnotateOperatorCostCardinalityRule implements IAlgebraicRewriteRule {
+
+    private boolean hasApplied = false;
+
+    public AnnotateOperatorCostCardinalityRule() {
+    }
+
+    @Override
+    public boolean rewritePre(Mutable<ILogicalOperator> opRef, IOptimizationContext context)
+            throws AlgebricksException {
+        if (hasApplied) {
+            return false;
+        }
+        hasApplied = true;
+        EstimatedCostComputationVisitor estCostCompVisitor = new EstimatedCostComputationVisitor();
+        opRef.getValue().accept(estCostCompVisitor, null);
+        return true;
+    }
+
+    @Override
+    public boolean rewritePost(Mutable<ILogicalOperator> opRef, IOptimizationContext context)
+            throws AlgebricksException {
+        return false;
+    }
+}
diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/AbstractIntroduceAccessMethodRule.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/AbstractIntroduceAccessMethodRule.java
index 5be9d66..52f0279 100644
--- a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/AbstractIntroduceAccessMethodRule.java
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/AbstractIntroduceAccessMethodRule.java
@@ -120,11 +120,10 @@
      * @param analyzedAMs
      * @param context
      * @param isJoinLeftBranch
-     * @param isArbitraryFormOfSubtree
-     *            if the given subtree is in an arbitrary form that OptimizableSubTree class can't initialize, we try
-     *            to fill the field type of each variable that is used in the optimizable function expressions.
-     *            This way, an index-nested-loop-join transformation can be conducted properly since the transformation
-     *            process skips an optimzable function expression if the field type of one of its variable is unknown.
+     * @param isArbitraryFormOfSubtree if the given subtree is in an arbitrary form that OptimizableSubTree class can't initialize, we try
+     *                                 to fill the field type of each variable that is used in the optimizable function expressions.
+     *                                 This way, an index-nested-loop-join transformation can be conducted properly since the transformation
+     *                                 process skips an optimzable function expression if the field type of one of its variable is unknown.
      * @throws AlgebricksException
      */
     protected void fillSubTreeIndexExprs(OptimizableOperatorSubTree subTree,
@@ -174,13 +173,14 @@
     }
 
     protected void pruneIndexCandidates(Map<IAccessMethod, AccessMethodAnalysisContext> analyzedAMs,
-            IOptimizationContext context, IVariableTypeEnvironment typeEnvironment) throws AlgebricksException {
+            IOptimizationContext context, IVariableTypeEnvironment typeEnvironment, boolean checkApplicableOnly)
+            throws AlgebricksException {
         Iterator<Map.Entry<IAccessMethod, AccessMethodAnalysisContext>> amIt = analyzedAMs.entrySet().iterator();
         // Check applicability of indexes by access method type.
         while (amIt.hasNext()) {
             Map.Entry<IAccessMethod, AccessMethodAnalysisContext> entry = amIt.next();
             AccessMethodAnalysisContext amCtx = entry.getValue();
-            pruneIndexCandidates(entry.getKey(), amCtx, context, typeEnvironment);
+            pruneIndexCandidates(entry.getKey(), amCtx, context, typeEnvironment, checkApplicableOnly);
             // Remove access methods for which there are definitely no
             // applicable indexes.
             if (amCtx.isIndexExprsAndVarsEmpty()) {
@@ -194,7 +194,8 @@
      * process by making it more systematic.
      */
     protected Pair<IAccessMethod, Index> chooseBestIndex(Map<IAccessMethod, AccessMethodAnalysisContext> analyzedAMs) {
-        List<Pair<IAccessMethod, Index>> list = chooseAllIndexes(analyzedAMs);
+        List<Pair<IAccessMethod, Index>> list = new ArrayList<>();
+        chooseAllIndexes(analyzedAMs, list);
         return list.isEmpty() ? null : list.get(0);
     }
 
@@ -206,9 +207,8 @@
      * [InvertedIndexAccessMethod, IndexType.SINGLE_PARTITION_WORD_INVIX || SINGLE_PARTITION_NGRAM_INVIX ||
      * LENGTH_PARTITIONED_WORD_INVIX || LENGTH_PARTITIONED_NGRAM_INVIX]
      */
-    protected List<Pair<IAccessMethod, Index>> chooseAllIndexes(
-            Map<IAccessMethod, AccessMethodAnalysisContext> analyzedAMs) {
-        List<Pair<IAccessMethod, Index>> result = new ArrayList<>();
+    protected void chooseAllIndexes(Map<IAccessMethod, AccessMethodAnalysisContext> analyzedAMs,
+            List<Pair<IAccessMethod, Index>> result) {
         // Use variables (fields) to the index types map to check which type of indexes are applied for the vars.
         Map<List<Pair<Integer, Integer>>, List<IndexType>> resultVarsToIndexTypesMap = new HashMap<>();
         Iterator<Map.Entry<IAccessMethod, AccessMethodAnalysisContext>> amIt = analyzedAMs.entrySet().iterator();
@@ -265,7 +265,6 @@
                 }
             }
         }
-        return result;
     }
 
     private boolean isSameFullTextConfigInIndexAndQuery(AccessMethodAnalysisContext analysisCtx,
@@ -305,7 +304,8 @@
      * @throws AlgebricksException
      */
     public void pruneIndexCandidates(IAccessMethod accessMethod, AccessMethodAnalysisContext analysisCtx,
-            IOptimizationContext context, IVariableTypeEnvironment typeEnvironment) throws AlgebricksException {
+            IOptimizationContext context, IVariableTypeEnvironment typeEnvironment, boolean checkApplicableOnly)
+            throws AlgebricksException {
         Iterator<Map.Entry<Index, List<Pair<Integer, Integer>>>> indexExprAndVarIt =
                 analysisCtx.getIteratorForIndexExprsAndVars();
         boolean hasIndexPreferences = false;
@@ -363,7 +363,7 @@
                     final IOptimizableFuncExpr optFuncExpr = analysisCtx.getMatchedFuncExpr(exprAndVarIdx.first);
                     // If expr is not optimizable by concrete index then remove
                     // expr and continue.
-                    if (!accessMethod.exprIsOptimizable(index, optFuncExpr)) {
+                    if (!accessMethod.exprIsOptimizable(index, optFuncExpr, checkApplicableOnly)) {
                         exprsAndVarIter.remove();
                         continue;
                     }
@@ -662,7 +662,7 @@
      * optimizable function expression.
      *
      * @return true if a candidate index was added to foundIndexExprs, false
-     *         otherwise
+     * otherwise
      * @throws AlgebricksException
      */
     protected boolean fillIndexExprs(List<Index> datasetIndexes, List<String> fieldName, IAType fieldType,
diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/AccessMethodUtils.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/AccessMethodUtils.java
index ddc4964..0196d91 100644
--- a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/AccessMethodUtils.java
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/AccessMethodUtils.java
@@ -1736,10 +1736,10 @@
      * false positive results, we can apply instantTryLock() on PK optimization since a result from these indexes
      * doesn't have to be verified by the primary index-lookup and a subsequent SELECT operator.
      * (i.e., we can guarantee the correctness of the result.)
-     *
+     * <p>
      * Case A) non-index-only plan
      * sidx-search -> (optional) sort -> (optional) distinct -> pdix-search
-     *
+     * <p>
      * Case B) index-only plan
      * left path (an instantTryLock() on the PK fail path):
      * right path(an instantTryLock() on the PK success path):
@@ -2359,10 +2359,9 @@
      * unless the variables are produced after the SELECT (JOIN) operator.
      *
      * @return Pair<Boolean, Boolean>: the first boolean value tells whether the given plan is an index-only plan.
-     *         The second boolean value tells whether the secondary key field variable(s) are used after the given
-     *         SELECT (JOIN) operator.
+     * The second boolean value tells whether the secondary key field variable(s) are used after the given
+     * SELECT (JOIN) operator.
      * @throws AlgebricksException
-     *
      */
     private static void checkVarUsageAfterSelectOp(List<Mutable<ILogicalOperator>> afterSelectOpRefs,
             List<LogicalVariable> liveVarsAfterSelJoinOp, List<LogicalVariable> dataScanPKVars,
@@ -2849,12 +2848,9 @@
     /**
      * Checks whether a LogicalVariable exists in a list of Triple<LogicalVariable, LogicalVariable, LogicalVariable>.
      *
-     * @param varsList
-     *            list that contains triples of LogicalVariable.
-     * @param varToFind
-     *            a LogicalVariable to find
-     * @param checkOnlyFirst
-     *            specifies whether it is required to check only the first variable in the given triple.
+     * @param varsList       list that contains triples of LogicalVariable.
+     * @param varToFind      a LogicalVariable to find
+     * @param checkOnlyFirst specifies whether it is required to check only the first variable in the given triple.
      * @return
      */
     public static boolean findVarInTripleVarList(
diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/BTreeAccessMethod.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/BTreeAccessMethod.java
index 2eebe5b..7c09b59 100644
--- a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/BTreeAccessMethod.java
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/BTreeAccessMethod.java
@@ -1020,7 +1020,8 @@
     }
 
     @Override
-    public boolean exprIsOptimizable(Index index, IOptimizableFuncExpr optFuncExpr) throws AlgebricksException {
+    public boolean exprIsOptimizable(Index index, IOptimizableFuncExpr optFuncExpr, boolean checkApplicableOnly)
+            throws AlgebricksException {
         // If we are optimizing a join, check for the indexed nested-loop join hint.
         if (optFuncExpr.getNumLogicalVars() == 2) {
             if (optFuncExpr.getOperatorSubTree(0) == optFuncExpr.getOperatorSubTree(1)) {
@@ -1033,7 +1034,8 @@
                     //And we were unable to determine its type
                     return false;
                 }
-            } else if (!optFuncExpr.getFuncExpr().hasAnnotation(IndexedNLJoinExpressionAnnotation.class)) {
+            } else if (!checkApplicableOnly
+                    && !optFuncExpr.getFuncExpr().hasAnnotation(IndexedNLJoinExpressionAnnotation.class)) {
                 return false;
             }
         }
diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/IAccessMethod.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/IAccessMethod.java
index 5688a70..bac1a0b 100644
--- a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/IAccessMethod.java
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/IAccessMethod.java
@@ -47,8 +47,8 @@
 
     /**
      * @return A list of function identifiers that are optimizable by this
-     *         access method. Also, the second boolean tells whether that
-     *         function can generate a false-positive result.
+     * access method. Also, the second boolean tells whether that
+     * function can generate a false-positive result.
      */
     public List<Pair<FunctionIdentifier, Boolean>> getOptimizableFunctions();
 
@@ -61,7 +61,7 @@
      * OptimizableFunction to analysisCtx.matchedFuncExprs for further analysis.
      *
      * @return true if funcExpr is optimizable by this access method, false
-     *         otherwise
+     * otherwise
      * @throws AlgebricksException
      */
     boolean analyzeFuncExprArgsAndUpdateAnalysisCtx(AbstractFunctionCallExpression funcExpr,
@@ -71,8 +71,8 @@
     /**
      * Indicates whether this access method is applicable for the given index type.
      *
-     * @return boolean
      * @param indexType
+     * @return boolean
      */
     public boolean matchIndexType(IndexType indexType);
 
@@ -80,8 +80,8 @@
      * Indicates whether all index expressions must be matched in order for this
      * index to be applicable.
      *
-     * @return boolean
      * @param index
+     * @return boolean
      */
     public boolean matchAllIndexExprs(Index index);
 
@@ -89,8 +89,8 @@
      * Indicates whether this index is applicable if only a prefix of the index
      * expressions are matched.
      *
-     * @return boolean
      * @param index
+     * @return boolean
      */
     public boolean matchPrefixIndexExprs(Index index);
 
@@ -127,7 +127,8 @@
      *
      * @throws AlgebricksException
      */
-    public boolean exprIsOptimizable(Index index, IOptimizableFuncExpr optFuncExpr) throws AlgebricksException;
+    public boolean exprIsOptimizable(Index index, IOptimizableFuncExpr optFuncExpr, boolean checkApplicableOnly)
+            throws AlgebricksException;
 
     public Collection<String> getSecondaryIndexPreferences(IOptimizableFuncExpr optFuncExpr);
 
@@ -136,12 +137,11 @@
     /**
      * Checks whether the function applied to an indexed field is acceptable by the access method.
      *
-     * @param functionExpr applied function
-     * @param index the index definition
+     * @param functionExpr     applied function
+     * @param index            the index definition
      * @param indexedFieldType the type of the indexed field in the index definition
-     * @param defaultNull true if the candidate index has CAST (DEFAULT NULL) modifier
-     * @param finalStep true if the functionExpr is the final function applied
-     *
+     * @param defaultNull      true if the candidate index has CAST (DEFAULT NULL) modifier
+     * @param finalStep        true if the functionExpr is the final function applied
      * @return true if the access method accepts the argument function. False, otherwise.
      */
     public boolean acceptsFunction(AbstractFunctionCallExpression functionExpr, Index index, IAType indexedFieldType,
diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/IntroduceJoinAccessMethodRule.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/IntroduceJoinAccessMethodRule.java
index 751e216..b2b5e7c 100644
--- a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/IntroduceJoinAccessMethodRule.java
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/IntroduceJoinAccessMethodRule.java
@@ -58,21 +58,21 @@
  * The order of the join inputs matters (left branch - outer relation, right branch - inner relation).
  * This rule tries to utilize an index on the inner relation.
  * If that's not possible, it stops transforming the given join into an index-nested-loop join.
- *
+ * <p>
  * This rule replaces the above pattern with the following simplified plan:
  * select <-- assign+ <-- unnest-map(pidx) <-- sort <-- unnest-map(sidx) <-- assign+ <-- (datasource scan|unnest-map)
  * The sorting PK process is optional, and some access methods may choose not to sort.
  * Note that for some index-based optimizations we do not remove the triggering
  * condition from the join, since the secondary index may only act as a filter, and the
  * final verification must still be done with the original join condition.
- *
+ * <p>
  * The basic outline of this rule is:
  * 1. Match operator pattern.
  * 2. Analyze join condition to see if there are optimizable functions (delegated to IAccessMethods).
  * 3. Check metadata to see if there are applicable indexes.
  * 4. Choose an index to apply (for now only a single index will be chosen).
  * 5. Rewrite plan using index (delegated to IAccessMethods).
- *
+ * <p>
  * For left-outer-join, additional patterns are checked and additional treatment is needed as follows:
  * 1. First it checks if there is a groupByOp above the join: groupby <-- leftouterjoin
  * 2. Inherently, only the right-subtree of the lojOp can be used as indexSubtree.
@@ -81,7 +81,7 @@
  * Here, the primary key variable from datasourceScanOp replaces the introduced null placeholder variable.
  * If the primary key is a composite key, then the first variable of the primary key variables becomes the
  * null place holder variable. This null placeholder variable works for all three types of indexes.
- *
+ * <p>
  * If the inner-branch can be transformed as an index-only plan, this rule creates an index-only-plan path
  * that is similar to one described in IntroduceSelectAccessMethod Rule.
  */
@@ -140,7 +140,7 @@
         afterJoinRefs = new ArrayList<>();
         // Recursively checks the given plan whether the desired pattern exists in it.
         // If so, try to optimize the plan.
-        boolean planTransformed = checkAndApplyJoinTransformation(opRef, context);
+        boolean planTransformed = checkAndApplyJoinTransformation(opRef, context, false);
 
         if (joinOp != null) {
             // We found an optimization here. Don't need to optimize this operator again.
@@ -156,6 +156,27 @@
         return planTransformed;
     }
 
+    public boolean checkApplicable(Mutable<ILogicalOperator> opRef, IOptimizationContext context)
+            throws AlgebricksException {
+        clear();
+        setMetadataDeclarations(context);
+
+        AbstractLogicalOperator op = (AbstractLogicalOperator) opRef.getValue();
+
+        afterJoinRefs = new ArrayList<>();
+        // Recursively checks the given plan whether the desired pattern exists in it.
+        // If so, try to optimize the plan.
+        boolean planTransformed = checkAndApplyJoinTransformation(opRef, context, true);
+
+        if (!planTransformed) {
+            return false;
+        } else {
+            OperatorPropertiesUtil.typeOpRec(opRef, context);
+        }
+
+        return planTransformed;
+    }
+
     /**
      * Removes indexes from the outer branch from the optimizer's consideration for this rule,
      * since we only use indexes from the inner branch.
@@ -234,8 +255,8 @@
      * optimize the path from the given join operator to the EMPTY_TUPLE_SOURCE operator
      * if it is not already optimized.
      */
-    protected boolean checkAndApplyJoinTransformation(Mutable<ILogicalOperator> opRef, IOptimizationContext context)
-            throws AlgebricksException {
+    protected boolean checkAndApplyJoinTransformation(Mutable<ILogicalOperator> opRef, IOptimizationContext context,
+            boolean checkApplicableOnly) throws AlgebricksException {
         AbstractLogicalOperator op = (AbstractLogicalOperator) opRef.getValue();
         boolean joinFoundAndOptimizationApplied;
 
@@ -246,7 +267,7 @@
         // Recursively check the plan and try to optimize it. We first check the children of the given operator
         // to make sure an earlier join in the path is optimized first.
         for (Mutable<ILogicalOperator> inputOpRef : op.getInputs()) {
-            joinFoundAndOptimizationApplied = checkAndApplyJoinTransformation(inputOpRef, context);
+            joinFoundAndOptimizationApplied = checkAndApplyJoinTransformation(inputOpRef, context, checkApplicableOnly);
             if (joinFoundAndOptimizationApplied) {
                 return true;
             }
@@ -313,7 +334,7 @@
                 // the subplan into the index branch and giving the join a condition for this rule to optimize.
                 // *No nodes* from this rewrite will be used beyond this point.
                 joinFromSubplanRewrite.findAfterSubplanSelectOperator(afterJoinRefs);
-                if (rewriteLocallyAndTransform(joinRef, context, joinFromSubplanRewrite)) {
+                if (rewriteLocallyAndTransform(joinRef, context, joinFromSubplanRewrite, checkApplicableOnly)) {
                     // Connect the after-join operators to the index subtree root before this rewrite. This also avoids
                     // performing the secondary index validation step twice.
                     ILogicalOperator lastAfterJoinOp = afterJoinRefs.get(afterJoinRefs.size() - 1).getValue();
@@ -364,7 +385,7 @@
                 fillSubTreeIndexExprs(rightSubTree, analyzedAMs, context, false);
 
                 // Prunes the access methods based on the function expression and access methods.
-                pruneIndexCandidates(analyzedAMs, context, typeEnvironment);
+                pruneIndexCandidates(analyzedAMs, context, typeEnvironment, checkApplicableOnly);
 
                 // If the right subtree (inner branch) has indexes, one of those indexes will be used.
                 // Removes the indexes from the outer branch in the optimizer's consideration list for this rule.
@@ -426,6 +447,10 @@
                         return false;
                     }
 
+                    if (checkApplicableOnly) {
+                        return true;
+                    }
+
                     // Finally, tries to apply plan transformation using the chosen index.
                     boolean res = chosenIndex.first.applyJoinPlanTransformation(afterJoinRefs, joinRef, leftSubTree,
                             rightSubTree, chosenIndex.second, analysisCtx, context, isLeftOuterJoin,
@@ -487,12 +512,13 @@
     }
 
     private boolean rewriteLocallyAndTransform(Mutable<ILogicalOperator> opRef, IOptimizationContext context,
-            IIntroduceAccessMethodRuleLocalRewrite<AbstractBinaryJoinOperator> rewriter) throws AlgebricksException {
+            IIntroduceAccessMethodRuleLocalRewrite<AbstractBinaryJoinOperator> rewriter, boolean checkApplicableOnly)
+            throws AlgebricksException {
         AbstractBinaryJoinOperator joinRewrite = rewriter.createOperator(joinOp, context);
         boolean transformationResult = false;
         if (joinRewrite != null) {
             Mutable<ILogicalOperator> joinRuleInput = new MutableObject<>(joinRewrite);
-            transformationResult = checkAndApplyJoinTransformation(joinRuleInput, context);
+            transformationResult = checkAndApplyJoinTransformation(joinRuleInput, context, checkApplicableOnly);
         }
 
         // Restore our state, so we can look for more optimizations if this transformation failed.
diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/IntroduceSelectAccessMethodRule.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/IntroduceSelectAccessMethodRule.java
index 1cf4b0c..69b7d56 100644
--- a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/IntroduceSelectAccessMethodRule.java
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/IntroduceSelectAccessMethodRule.java
@@ -54,6 +54,7 @@
 import org.apache.hyracks.algebricks.core.algebra.operators.logical.OrderOperator;
 import org.apache.hyracks.algebricks.core.algebra.operators.logical.SelectOperator;
 import org.apache.hyracks.algebricks.core.algebra.operators.logical.visitors.VariableUtilities;
+import org.apache.hyracks.algebricks.core.algebra.prettyprint.IPlanPrettyPrinter;
 import org.apache.hyracks.algebricks.core.algebra.util.OperatorPropertiesUtil;
 
 /**
@@ -176,7 +177,44 @@
         afterSelectRefs = new ArrayList<>();
         // Recursively check the given plan whether the desired pattern exists in it.
         // If so, try to optimize the plan.
-        boolean planTransformed = checkAndApplyTheSelectTransformation(opRef, context);
+        List<Pair<IAccessMethod, Index>> chosenIndexes = new ArrayList<>();
+        Map<IAccessMethod, AccessMethodAnalysisContext> analyzedAMs = null;
+        boolean planTransformed =
+                checkAndApplyTheSelectTransformation(opRef, context, false, chosenIndexes, analyzedAMs);
+
+        if (selectOp != null) {
+            // We found an optimization here. Don't need to optimize this operator again.
+            context.addToDontApplySet(this, selectOp);
+        }
+
+        if (!planTransformed) {
+            return false;
+        } else {
+            OperatorPropertiesUtil.typeOpRec(opRef, context);
+        }
+
+        return planTransformed;
+    }
+
+    public boolean checkApplicable(Mutable<ILogicalOperator> opRef, IOptimizationContext context,
+            List<Pair<IAccessMethod, Index>> chosenIndexes, Map<IAccessMethod, AccessMethodAnalysisContext> analyzedAMs)
+            throws AlgebricksException {
+        clear();
+        setMetadataDeclarations(context);
+
+        AbstractLogicalOperator op = (AbstractLogicalOperator) opRef.getValue();
+
+        // Already checked?
+        if (context.checkIfInDontApplySet(this, op)) {
+            return false;
+        }
+
+        afterSelectRefs = new ArrayList<>();
+        // Recursively check the given plan whether the desired pattern exists in it.
+        // If so, try to optimize the plan.
+
+        boolean planTransformed =
+                checkAndApplyTheSelectTransformation(opRef, context, true, chosenIndexes, analyzedAMs);
 
         if (selectOp != null) {
             // We found an optimization here. Don't need to optimize this operator again.
@@ -256,7 +294,7 @@
      *
      * @param chosenIndexes
      * @return Pair<IAccessMethod, Index> for the primary index
-     *         null otherwise
+     * null otherwise
      * @throws AlgebricksException
      */
     private Pair<IAccessMethod, Index> fetchPrimaryIndexAmongChosenIndexes(
@@ -328,11 +366,13 @@
      * if it is not already optimized.
      */
     protected boolean checkAndApplyTheSelectTransformation(Mutable<ILogicalOperator> opRef,
-            IOptimizationContext context) throws AlgebricksException {
+            IOptimizationContext context, boolean checkApplicableOnly, List<Pair<IAccessMethod, Index>> chosenIndexes,
+            Map<IAccessMethod, AccessMethodAnalysisContext> analyzedAMs) throws AlgebricksException {
         AbstractLogicalOperator op = (AbstractLogicalOperator) opRef.getValue();
         boolean selectFoundAndOptimizationApplied;
         boolean isSelectOp = false;
 
+        IPlanPrettyPrinter pp = context.getPrettyPrinter();
         Mutable<ILogicalOperator> selectRefFromThisOp = null;
         SelectOperator selectOpFromThisOp = null;
 
@@ -351,7 +391,8 @@
         // Recursively check the plan and try to optimize it. We first check the children of the given operator
         // to make sure an earlier select in the path is optimized first.
         for (Mutable<ILogicalOperator> inputOpRef : op.getInputs()) {
-            selectFoundAndOptimizationApplied = checkAndApplyTheSelectTransformation(inputOpRef, context);
+            selectFoundAndOptimizationApplied = checkAndApplyTheSelectTransformation(inputOpRef, context,
+                    checkApplicableOnly, chosenIndexes, analyzedAMs);
             if (selectFoundAndOptimizationApplied) {
                 return true;
             }
@@ -376,8 +417,7 @@
 
             // For each access method, contains the information about
             // whether an available index can be applicable or not.
-            Map<IAccessMethod, AccessMethodAnalysisContext> analyzedAMs = null;
-            if (continueCheck) {
+            if (!checkApplicableOnly && continueCheck) {
                 analyzedAMs = new TreeMap<>();
             }
 
@@ -386,14 +426,14 @@
                 // If there exists a composite atomic-array index, our conjuncts will be split across multiple
                 // SELECTs. This rewrite is to be used **solely** for the purpose of changing a DATA-SCAN into a
                 // non-index-only plan branch. No nodes introduced from this rewrite will be used beyond this point.
-                if (rewriteLocallyAndTransform(selectRef, context, mergedSelectRewrite)) {
+                if (!checkApplicableOnly && rewriteLocallyAndTransform(selectRef, context, mergedSelectRewrite)) {
                     return true;
                 }
 
                 // If there exists a SUBPLAN in our plan, and we are conditioning on a variable, attempt to rewrite
                 // this subplan to allow an array-index AM to be introduced. Again, this rewrite is to be used
                 // **solely** for the purpose of changing a DATA-SCAN into a non-index-only plan branch.
-                if (rewriteLocallyAndTransform(selectRef, context, selectFromSubplanRewrite)) {
+                if (!checkApplicableOnly && rewriteLocallyAndTransform(selectRef, context, selectFromSubplanRewrite)) {
                     return true;
                 }
             }
@@ -426,20 +466,22 @@
                 fillSubTreeIndexExprs(subTree, analyzedAMs, context, false);
 
                 // Prune the access methods based on the function expression and access methods.
-                pruneIndexCandidates(analyzedAMs, context, typeEnvironment);
+                pruneIndexCandidates(analyzedAMs, context, typeEnvironment, false);
 
                 // Choose all indexes that will be applied.
-                List<Pair<IAccessMethod, Index>> chosenIndexes = chooseAllIndexes(analyzedAMs);
+                chooseAllIndexes(analyzedAMs, chosenIndexes);
 
                 if (chosenIndexes == null || chosenIndexes.isEmpty()) {
                     // We can't apply any index for this SELECT operator
                     context.addToDontApplySet(this, selectRef.getValue());
                     return false;
                 }
+                if (checkApplicableOnly) {
+                    return true;
+                }
 
                 // Apply plan transformation using chosen index.
                 boolean res;
-
                 // Primary index applicable?
                 Pair<IAccessMethod, Index> chosenPrimaryIndex = fetchPrimaryIndexAmongChosenIndexes(chosenIndexes);
                 if (chosenPrimaryIndex != null) {
@@ -497,7 +539,10 @@
         boolean transformationResult = false;
         if (selectRewrite != null) {
             Mutable<ILogicalOperator> selectRuleInput = new MutableObject<>(selectRewrite);
-            transformationResult = checkAndApplyTheSelectTransformation(selectRuleInput, context);
+            List<Pair<IAccessMethod, Index>> chosenIndexes = new ArrayList<>();
+            Map<IAccessMethod, AccessMethodAnalysisContext> analyzedAMs = null;
+            transformationResult =
+                    checkAndApplyTheSelectTransformation(selectRuleInput, context, false, chosenIndexes, analyzedAMs);
         }
 
         // Restore our state, so we can look for more optimizations if this transformation failed.
diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/InvertedIndexAccessMethod.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/InvertedIndexAccessMethod.java
index 62812aa..031bc74 100644
--- a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/InvertedIndexAccessMethod.java
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/InvertedIndexAccessMethod.java
@@ -949,7 +949,8 @@
     }
 
     @Override
-    public boolean exprIsOptimizable(Index index, IOptimizableFuncExpr optFuncExpr) throws AlgebricksException {
+    public boolean exprIsOptimizable(Index index, IOptimizableFuncExpr optFuncExpr, boolean checkApplicableOnly)
+            throws AlgebricksException {
         if (AccessMethodUtils.skipSecondaryIndexRequestedByAnnotation(index, optFuncExpr)) {
             return false;
         }
diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/RTreeAccessMethod.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/RTreeAccessMethod.java
index 6959543..3de78f7 100644
--- a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/RTreeAccessMethod.java
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/RTreeAccessMethod.java
@@ -381,7 +381,7 @@
     }
 
     @Override
-    public boolean exprIsOptimizable(Index index, IOptimizableFuncExpr optFuncExpr) {
+    public boolean exprIsOptimizable(Index index, IOptimizableFuncExpr optFuncExpr, boolean checkApplicableOnly) {
         if (AccessMethodUtils.skipSecondaryIndexRequestedByAnnotation(index, optFuncExpr)) {
             return false;
         }
diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/cbo/EnumerateJoinsRule.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/cbo/EnumerateJoinsRule.java
new file mode 100644
index 0000000..f389c8e
--- /dev/null
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/cbo/EnumerateJoinsRule.java
@@ -0,0 +1,582 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.asterix.optimizer.rules.cbo;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import org.apache.asterix.common.annotations.IndexedNLJoinExpressionAnnotation;
+import org.apache.asterix.metadata.entities.Index;
+import org.apache.commons.lang3.mutable.Mutable;
+import org.apache.commons.lang3.mutable.MutableInt;
+import org.apache.commons.lang3.mutable.MutableObject;
+import org.apache.hyracks.algebricks.common.exceptions.AlgebricksException;
+import org.apache.hyracks.algebricks.common.utils.Pair;
+import org.apache.hyracks.algebricks.core.algebra.base.ILogicalExpression;
+import org.apache.hyracks.algebricks.core.algebra.base.ILogicalOperator;
+import org.apache.hyracks.algebricks.core.algebra.base.IOptimizationContext;
+import org.apache.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
+import org.apache.hyracks.algebricks.core.algebra.base.LogicalVariable;
+import org.apache.hyracks.algebricks.core.algebra.base.OperatorAnnotations;
+import org.apache.hyracks.algebricks.core.algebra.expressions.AbstractFunctionCallExpression;
+import org.apache.hyracks.algebricks.core.algebra.expressions.BroadcastExpressionAnnotation;
+import org.apache.hyracks.algebricks.core.algebra.expressions.ConstantExpression;
+import org.apache.hyracks.algebricks.core.algebra.expressions.HashJoinExpressionAnnotation;
+import org.apache.hyracks.algebricks.core.algebra.expressions.IExpressionAnnotation;
+import org.apache.hyracks.algebricks.core.algebra.expressions.VariableReferenceExpression;
+import org.apache.hyracks.algebricks.core.algebra.functions.AlgebricksBuiltinFunctions;
+import org.apache.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.AbstractBinaryJoinOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.AssignOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.DataSourceScanOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.EmptyTupleSourceOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.visitors.VariableUtilities;
+import org.apache.hyracks.algebricks.core.algebra.prettyprint.IPlanPrettyPrinter;
+import org.apache.hyracks.algebricks.core.rewriter.base.CardHints;
+import org.apache.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
+import org.apache.hyracks.algebricks.core.rewriter.base.PhysicalOptimizationConfig;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+public class EnumerateJoinsRule implements IAlgebraicRewriteRule {
+
+    private static final Logger LOGGER = LogManager.getLogger();
+
+    protected final JoinEnum joinEnum;
+
+    public EnumerateJoinsRule(JoinEnum joinEnum) {
+        this.joinEnum = joinEnum;
+    }
+
+    @Override
+    public boolean rewritePost(Mutable<ILogicalOperator> opRef, IOptimizationContext context) {
+        return false;
+    }
+
+    /**
+     * If this method returns false, that means CBO code will not be used to optimize the part of the join graph that
+     * was passed in. Currently, we do not optimize query graphs with outer joins in them. If the CBO code is activated
+     * a new join graph (with inputs possibly switched) will be created and the return value will be true.
+     */
+    @Override
+    public boolean rewritePre(Mutable<ILogicalOperator> opRef, IOptimizationContext context)
+            throws AlgebricksException {
+        boolean cboMode = this.getCBOMode(context);
+        boolean cboTestMode = this.getCBOTestMode(context);
+        if (!(cboMode || cboTestMode)) {
+            return false;
+        }
+        // If we reach here, then either cboMode or cboTestMode is true.
+        // If cboTestMode is true, then we use predefined cardinalities for datasets for asterixdb regression tests.
+        // If cboMode is true, then all datasets need to have samples, otherwise the check in doAllDataSourcesHaveSamples()
+        // further below will return false.
+        ILogicalOperator op = opRef.getValue();
+        if (op.getOperatorTag() != LogicalOperatorTag.INNERJOIN) {
+            return false;
+        }
+
+        // if this join has already been seen before, no need to apply the rule again
+        if (context.checkIfInDontApplySet(this, op)) {
+            return false;
+        }
+
+        List<ILogicalOperator> joinOps = new ArrayList<>();
+        List<ILogicalOperator> internalEdges = new ArrayList<>();
+        HashMap<EmptyTupleSourceOperator, ILogicalOperator> joinLeafInputsHashMap = new HashMap<>();
+        // The data scan operators. Will be in the order of the from clause.
+        // Important for position ordering when assigning bits to join expressions.
+        List<Pair<EmptyTupleSourceOperator, DataSourceScanOperator>> emptyTupleAndDataSourceOps = new ArrayList<>();
+        HashMap<DataSourceScanOperator, EmptyTupleSourceOperator> dataSourceEmptyTupleHashMap = new HashMap<>();
+
+        IPlanPrettyPrinter pp = context.getPrettyPrinter();
+        printPlan(pp, (AbstractLogicalOperator) op, "Original Whole plan1");
+        boolean canTransform = getJoinOpsAndLeafInputs(op, emptyTupleAndDataSourceOps, joinLeafInputsHashMap,
+                dataSourceEmptyTupleHashMap, internalEdges, joinOps);
+
+        if (!canTransform) {
+            return false;
+        }
+
+        // if this happens, something in the input plan is not acceptable to the new code.
+        if (emptyTupleAndDataSourceOps.size() != joinLeafInputsHashMap.size()) {
+            throw new IllegalStateException(
+                    "ETS " + emptyTupleAndDataSourceOps.size() + " != LI " + joinLeafInputsHashMap.size());
+        }
+
+        printPlan(pp, (AbstractLogicalOperator) op, "Original Whole plan2");
+
+        int numberOfFromTerms = emptyTupleAndDataSourceOps.size();
+        Map<String, Object> querySpecificConfig = context.getMetadataProvider().getConfig();
+        CardHints cardHints = CardHints.getCardHintsInfo((String) querySpecificConfig.get("cardinality"));
+
+        joinEnum.initEnum((AbstractLogicalOperator) op, cboMode, cboTestMode, numberOfFromTerms,
+                emptyTupleAndDataSourceOps, joinLeafInputsHashMap, dataSourceEmptyTupleHashMap, internalEdges, joinOps,
+                cardHints, context);
+
+        if (cboMode) {
+            if (!doAllDataSourcesHaveSamples(emptyTupleAndDataSourceOps, context)) {
+                return false;
+            }
+        }
+
+        printPlan(pp, (AbstractLogicalOperator) op, "Before calling new code. same plan still??");
+        int cheapestPlan = joinEnum.enumerateJoins();
+        printPlan(pp, (AbstractLogicalOperator) op, "After join enumeration. Must return same plan??");
+        if (cheapestPlan == PlanNode.NO_PLAN) {
+            return false;
+        }
+
+        PlanNode cheapestPlanNode = joinEnum.allPlans.get(cheapestPlan);
+        checkForMultipleUsesOfVariablesInJoinPreds(cheapestPlanNode, joinLeafInputsHashMap, context);
+        buildNewTree(cheapestPlanNode, joinLeafInputsHashMap, joinOps, new MutableInt(0));
+        ILogicalOperator root = addConstantInternalEdgesAtTheTop(joinOps.get(0), internalEdges);
+
+        printPlan(pp, (AbstractLogicalOperator) joinOps.get(0), "New Whole Plan after buildNewTree");
+        printPlan(pp, (AbstractLogicalOperator) root, "New Whole Plan after buildNewTree");
+
+        // this will be the new root
+        opRef.setValue(root);
+
+        if (LOGGER.isTraceEnabled()) {
+            LOGGER.trace("---------------------------- Printing Leaf Inputs");
+            printLeafPlans(pp, joinLeafInputsHashMap);
+            // print joins starting from the bottom
+            for (int i = joinOps.size() - 1; i >= 0; i--) {
+                printPlan(pp, (AbstractLogicalOperator) joinOps.get(i), "join " + i);
+            }
+            printPlan(pp, (AbstractLogicalOperator) joinOps.get(0), "New Whole Plan");
+            printPlan(pp, (AbstractLogicalOperator) root, "New Whole Plan");
+        }
+
+        // turn of this rule for all joins in this set (subtree)
+        for (ILogicalOperator joinOp : joinOps) {
+            context.addToDontApplySet(this, joinOp);
+        }
+        return true;
+    }
+
+    private boolean getCBOMode(IOptimizationContext context) {
+        PhysicalOptimizationConfig physOptConfig = context.getPhysicalOptimizationConfig();
+        return physOptConfig.getCBOMode();
+    }
+
+    private boolean getCBOTestMode(IOptimizationContext context) {
+        PhysicalOptimizationConfig physOptConfig = context.getPhysicalOptimizationConfig();
+        return physOptConfig.getCBOTestMode();
+    }
+
+    /**
+     * Should not see any kind of joins here. store the emptyTupeSourceOp and DataSource operators.
+     * Each leaf input will normally have both, but sometimes only emptyTupeSourceOp will be present (in lists)
+     */
+    private Pair<EmptyTupleSourceOperator, DataSourceScanOperator> containsLeafInputOnly(ILogicalOperator op) {
+        DataSourceScanOperator dataSourceOp = null;
+        ILogicalOperator currentOp = op;
+        while (currentOp.getInputs().size() == 1) {
+            if (currentOp.getOperatorTag() == LogicalOperatorTag.DATASOURCESCAN) {
+                // we should not see two data scans in the same path
+                if (dataSourceOp != null) {
+                    return null;
+                }
+                dataSourceOp = (DataSourceScanOperator) currentOp;
+            }
+            currentOp = currentOp.getInputs().get(0).getValue();
+        }
+        if (currentOp.getOperatorTag() == LogicalOperatorTag.EMPTYTUPLESOURCE) {
+            return new Pair<>((EmptyTupleSourceOperator) currentOp, dataSourceOp);
+        }
+        return null;
+    }
+
+    /**
+     * Check to see if there is only one assign here and nothing below that other than a join.
+     * have not seen cases where there is more than one assign in a leafinput.
+    */
+    private boolean onlyOneAssign(ILogicalOperator nextOp) {
+        if (nextOp.getOperatorTag() != LogicalOperatorTag.ASSIGN) {
+            return false;
+        }
+        List<Mutable<ILogicalOperator>> nextOpInputs = nextOp.getInputs();
+        return nextOpInputs.get(0).getValue().getOperatorTag() == LogicalOperatorTag.INNERJOIN;
+    }
+
+    /**
+     * This is the main routines that stores all the join operators and the leafInputs. We will later reuse the same
+     * join operators but switch the leafInputs (see buildNewTree). The whole scheme is based on the assumption that the
+     * leafInputs can be switched. The various data structures make the leafInputs accessible efficiently.
+     */
+    private boolean getJoinOpsAndLeafInputs(ILogicalOperator op,
+            List<Pair<EmptyTupleSourceOperator, DataSourceScanOperator>> emptyTupleAndDataSourceOps,
+            HashMap<EmptyTupleSourceOperator, ILogicalOperator> joinLeafInputsHashMap,
+            HashMap<DataSourceScanOperator, EmptyTupleSourceOperator> dataSourceEmptyTupleHashMap,
+            List<ILogicalOperator> internalEdges, List<ILogicalOperator> joinOps) {
+        if (op.getOperatorTag() == LogicalOperatorTag.LEFTOUTERJOIN) {
+            return false;
+        }
+        for (Mutable<ILogicalOperator> nextOp : op.getInputs()) {
+            boolean canTransform = getJoinOpsAndLeafInputs(nextOp.getValue(), emptyTupleAndDataSourceOps,
+                    joinLeafInputsHashMap, dataSourceEmptyTupleHashMap, internalEdges, joinOps);
+            if (!canTransform) {
+                return false;
+            }
+        }
+        if (op.getOperatorTag() == LogicalOperatorTag.INNERJOIN) {
+            joinOps.add(op);
+            // follow the inputs and see if they reach a datascan operator
+            for (int i = 0; i < 2; i++) {
+                ILogicalOperator nextOp = op.getInputs().get(i).getValue();
+                Pair<EmptyTupleSourceOperator, DataSourceScanOperator> etsDataSource = containsLeafInputOnly(nextOp);
+                if (etsDataSource == null) {
+                    // this means that we did not find a emptyTupleSourceOp operator. Could be an internal edge
+                    if (nextOp.getOperatorTag() != LogicalOperatorTag.INNERJOIN) {
+                        if (onlyOneAssign(nextOp)) {
+                            // currently, will handle only assign statement and nothing else in an internal Edge.
+                            // we can lift this restriction later if the need arises. This just makes some code easier.
+                            internalEdges.add(nextOp);
+                        } else {
+                            return false;
+                        }
+                    }
+                } else {
+                    EmptyTupleSourceOperator etsOp = etsDataSource.first;
+                    DataSourceScanOperator dataSourceOp = etsDataSource.second;
+                    emptyTupleAndDataSourceOps.add(new Pair<>(etsOp, dataSourceOp));
+                    joinLeafInputsHashMap.put(etsOp, nextOp);
+                    dataSourceEmptyTupleHashMap.put(dataSourceOp, etsOp);
+                }
+            }
+        }
+        return true;
+    }
+
+    private void addCardCostAnnotations(ILogicalOperator op, PlanNode plan) {
+        op.getAnnotations().put(OperatorAnnotations.OP_OUTPUT_CARDINALITY,
+                (double) Math.round(plan.getJoinNode().getCardinality() * 100) / 100);
+        op.getAnnotations().put(OperatorAnnotations.OP_COST_TOTAL,
+                (double) Math.round(plan.computeTotalCost() * 100) / 100);
+        if (plan.IsScanNode()) {
+            op.getAnnotations().put(OperatorAnnotations.OP_INPUT_CARDINALITY,
+                    (double) Math.round(plan.getJoinNode().getOrigCardinality() * 100) / 100);
+            op.getAnnotations().put(OperatorAnnotations.OP_COST_LOCAL,
+                    (double) Math.round(plan.computeOpCost() * 100) / 100);
+        } else {
+            op.getAnnotations().put(OperatorAnnotations.OP_LEFT_EXCHANGE_COST,
+                    (double) Math.round(plan.getLeftExchangeCost() * 100) / 100);
+            op.getAnnotations().put(OperatorAnnotations.OP_RIGHT_EXCHANGE_COST,
+                    (double) Math.round(plan.getRightExchangeCost() * 100) / 100);
+            op.getAnnotations().put(OperatorAnnotations.OP_COST_LOCAL,
+                    (double) Math.round(
+                            (plan.computeOpCost() - plan.getLeftExchangeCost() - plan.getRightExchangeCost()) * 100)
+                            / 100);
+        }
+
+        if (op.getOperatorTag().equals(LogicalOperatorTag.SELECT)) {
+            op.getAnnotations().put(OperatorAnnotations.OP_COST_LOCAL, 0.0);
+        }
+    }
+
+    /**
+     * Finds the DataSourceScanOperator given a leafInput
+     */
+    private ILogicalOperator findDataSourceScanOperator(ILogicalOperator op) {
+        ILogicalOperator origOp = op;
+        while (op != null && op.getOperatorTag() != LogicalOperatorTag.EMPTYTUPLESOURCE) {
+            if (op.getOperatorTag().equals(LogicalOperatorTag.DATASOURCESCAN)) {
+                return op;
+            }
+            op = op.getInputs().get(0).getValue();
+        }
+        return origOp;
+    }
+
+    private void removeJoinAnnotations(AbstractFunctionCallExpression afcExpr) {
+        afcExpr.removeAnnotation(BroadcastExpressionAnnotation.class);
+        afcExpr.removeAnnotation(IndexedNLJoinExpressionAnnotation.class);
+        afcExpr.removeAnnotation(HashJoinExpressionAnnotation.class);
+    }
+
+    private void setAnnotation(AbstractFunctionCallExpression afcExpr, IExpressionAnnotation anno) {
+        FunctionIdentifier fi = afcExpr.getFunctionIdentifier();
+        List<Mutable<ILogicalExpression>> arguments = afcExpr.getArguments();
+        int argumentCount = arguments.size();
+
+        if (fi.equals(AlgebricksBuiltinFunctions.AND)) {
+            for (int i = 0; i < argumentCount; i++) {
+                ILogicalExpression argument = arguments.get(i).getValue();
+                AbstractFunctionCallExpression expr = (AbstractFunctionCallExpression) argument;
+                expr.putAnnotation(anno);
+            }
+        } else {
+            afcExpr.putAnnotation(anno);
+        }
+    }
+
+    private void buildNewTree(PlanNode plan, HashMap<EmptyTupleSourceOperator, ILogicalOperator> joinLeafInputsHashMap,
+            List<ILogicalOperator> joinOps, MutableInt totalNumberOfJoins) {
+        // we have to move the inputs in op around so that they match the tree structure in pn
+        // we use the existing joinOps and switch the leafInputs appropriately.
+        List<PlanNode> allPlans = joinEnum.getAllPlans();
+        int leftIndex = plan.getLeftPlanIndex();
+        int rightIndex = plan.getRightPlanIndex();
+        PlanNode leftPlan = allPlans.get(leftIndex);
+        PlanNode rightPlan = allPlans.get(rightIndex);
+        ILogicalOperator joinOp = joinOps.get(totalNumberOfJoins.intValue());
+
+        if (plan.IsJoinNode()) {
+            AbstractBinaryJoinOperator abJoinOp = (AbstractBinaryJoinOperator) joinOp;
+            ILogicalExpression expr = plan.getJoinExpr();
+            abJoinOp.getCondition().setValue(expr);
+            // add the annotations
+            if (plan.getJoinOp() == PlanNode.JoinMethod.INDEX_NESTED_LOOP_JOIN) {
+                // this annotation is needed for the physical optimizer to replace this with the unnest operator later
+                AbstractFunctionCallExpression afcExpr = (AbstractFunctionCallExpression) expr;
+                removeJoinAnnotations(afcExpr);
+                setAnnotation(afcExpr, IndexedNLJoinExpressionAnnotation.INSTANCE_ANY_INDEX);
+            } else if (plan.getJoinOp() == PlanNode.JoinMethod.HYBRID_HASH_JOIN
+                    || plan.getJoinOp() == PlanNode.JoinMethod.BROADCAST_HASH_JOIN
+                    || plan.getJoinOp() == PlanNode.JoinMethod.CARTESIAN_PRODUCT_JOIN) {
+                if (plan.getJoinOp() == PlanNode.JoinMethod.BROADCAST_HASH_JOIN) {
+                    // Broadcast the right branch.
+                    BroadcastExpressionAnnotation bcast =
+                            new BroadcastExpressionAnnotation(plan.side == HashJoinExpressionAnnotation.BuildSide.RIGHT
+                                    ? BroadcastExpressionAnnotation.BroadcastSide.RIGHT
+                                    : BroadcastExpressionAnnotation.BroadcastSide.LEFT);
+                    AbstractFunctionCallExpression afcExpr = (AbstractFunctionCallExpression) expr;
+                    removeJoinAnnotations(afcExpr);
+                    setAnnotation(afcExpr, bcast);
+                } else if (plan.getJoinOp() == PlanNode.JoinMethod.HYBRID_HASH_JOIN) {
+                    HashJoinExpressionAnnotation hjAnnotation = new HashJoinExpressionAnnotation(plan.side);
+                    AbstractFunctionCallExpression afcExpr = (AbstractFunctionCallExpression) expr;
+                    removeJoinAnnotations(afcExpr);
+                    setAnnotation(afcExpr, hjAnnotation);
+                } else {
+                    if (expr != ConstantExpression.TRUE) {
+                        AbstractFunctionCallExpression afcExpr = (AbstractFunctionCallExpression) expr;
+                        removeJoinAnnotations(afcExpr);
+                    }
+                }
+            }
+            addCardCostAnnotations(joinOp, plan);
+        }
+
+        if (leftPlan.IsScanNode()) {
+            // leaf
+            ILogicalOperator leftInput = joinLeafInputsHashMap.get(leftPlan.getEmptyTupleSourceOp());
+            if (leftInput.getOperatorTag() == LogicalOperatorTag.SELECT) {
+                addCardCostAnnotations(leftInput, leftPlan);
+            }
+            joinOp.getInputs().get(0).setValue(leftInput);
+            addCardCostAnnotations(findDataSourceScanOperator(leftInput), leftPlan);
+        } else {
+            // join
+            totalNumberOfJoins.increment();
+            ILogicalOperator leftInput = joinOps.get(totalNumberOfJoins.intValue());
+            joinOp.getInputs().get(0).setValue(leftInput);
+            buildNewTree(allPlans.get(leftIndex), joinLeafInputsHashMap, joinOps, totalNumberOfJoins);
+        }
+
+        if (rightPlan.IsScanNode()) {
+            // leaf
+            ILogicalOperator rightInput = joinLeafInputsHashMap.get(rightPlan.getEmptyTupleSourceOp());
+            if (rightInput.getOperatorTag() == LogicalOperatorTag.SELECT) {
+                addCardCostAnnotations(rightInput, rightPlan);
+            }
+            joinOp.getInputs().get(1).setValue(rightInput);
+            addCardCostAnnotations(findDataSourceScanOperator(rightInput), rightPlan);
+        } else {
+            // join
+            totalNumberOfJoins.increment();
+            ILogicalOperator rightInput = joinOps.get(totalNumberOfJoins.intValue());
+            joinOp.getInputs().get(1).setValue(rightInput);
+            buildNewTree(allPlans.get(rightIndex), joinLeafInputsHashMap, joinOps, totalNumberOfJoins);
+        }
+    }
+
+    // in some very rare cases, there is an internal edge that has an assign statement such as $$var = 20 but this variable
+    // is not used anywhere in the current join graph but is used outside the current join graph. So we add this assign to the top of
+    // our plan, so the rest of the code will be happy. Strange that this assign appears in the join graph.
+    private ILogicalOperator addConstantInternalEdgesAtTheTop(ILogicalOperator op,
+            List<ILogicalOperator> internalEdges) {
+        ILogicalOperator root = op;
+        for (ILogicalOperator ie : internalEdges) {
+            // this will be an Assign, so no need to check
+            AssignOperator aOp = (AssignOperator) ie;
+            aOp.getInputs().get(0).setValue(root);
+            root = aOp;
+        }
+        return root;
+    }
+
+    public static void printPlan(IPlanPrettyPrinter pp, AbstractLogicalOperator op, String text)
+            throws AlgebricksException {
+        if (LOGGER.isTraceEnabled()) {
+            LOGGER.trace("---------------------------- " + text);
+            pp.reset();
+            pp.printOperator(op, true);
+            LOGGER.trace(pp);
+            LOGGER.trace("---------------------------- ");
+        }
+    }
+
+    private void printLeafPlans(IPlanPrettyPrinter pp,
+            HashMap<EmptyTupleSourceOperator, ILogicalOperator> joinLeafInputsHashMap) throws AlgebricksException {
+        Iterator<Map.Entry<EmptyTupleSourceOperator, ILogicalOperator>> li =
+                joinLeafInputsHashMap.entrySet().iterator();
+        int i = 0;
+        while (li.hasNext()) {
+            Map.Entry<EmptyTupleSourceOperator, ILogicalOperator> pair = li.next();
+            ILogicalOperator element = pair.getValue();
+            printPlan(pp, (AbstractLogicalOperator) element, "Printing Leaf Input" + i);
+            i++;
+        }
+    }
+
+    private boolean allEqualityPreds(ILogicalExpression expr) {
+        List<Mutable<ILogicalExpression>> conjs = new ArrayList<>();
+        // check that the expr is AND(EQ(), EQ(),..)
+        if (expr.splitIntoConjuncts(conjs)) {
+            for (Mutable<ILogicalExpression> conj : conjs) {
+                if (!(((AbstractFunctionCallExpression) conj.getValue()).getFunctionIdentifier()
+                        .equals(AlgebricksBuiltinFunctions.EQ))) {
+                    return false;
+                }
+            }
+            return true;
+        }
+        return false;
+    }
+
+    // This routine should not be needed! When the same variable is used multiple times in a join predicate as in
+    // AND(eq($$25, $$27), eq($$25, $$34)), JoinUtils.isHashJoinCondition() returns false which makes no sense.
+    // Tried changing the above routine but it always lead to some failures. Unable to figure out what the problem was,
+    // we just replace the duplicate occurrence of every variable with a new variable following by appropriate assign.
+    // We do this only once just once before we construct the final plan.
+    private void checkForMultipleUsesOfVariablesInJoinPreds(PlanNode plan,
+            HashMap<EmptyTupleSourceOperator, ILogicalOperator> joinLeafInputsHashMap, IOptimizationContext context)
+            throws AlgebricksException {
+        List<PlanNode> allPlans = joinEnum.getAllPlans();
+        if (plan.IsJoinNode()) {
+            ILogicalExpression exp = plan.getJoinExpr();
+            if (!allEqualityPreds(exp)) {
+                return;
+            }
+            boolean changes = true;
+            while (changes) {
+                changes = false;
+                List<LogicalVariable> vars = new ArrayList<>();
+                exp.getUsedVariables(vars);
+                Set<LogicalVariable> set = new LinkedHashSet<>();
+                set.addAll(vars);
+                if (set.size() < vars.size()) {
+                    // walk thru vars and find the first instance of the duplicate
+                    for (int i = 0; i < vars.size() - 1; i++) {
+                        for (int j = i + 1; j < vars.size(); j++) {
+                            if (vars.get(i) == vars.get(j)) {
+                                /// find the leafInout that contains this vars(i)
+                                for (Map.Entry<EmptyTupleSourceOperator, ILogicalOperator> mapElement : joinLeafInputsHashMap
+                                        .entrySet()) {
+                                    ILogicalOperator joinLeafInput = mapElement.getValue();
+                                    EmptyTupleSourceOperator ets = mapElement.getKey();
+                                    HashSet<LogicalVariable> vars2 = new HashSet<>();
+                                    VariableUtilities.getLiveVariables(joinLeafInput, vars2);
+                                    if (vars2.contains(vars.get(i))) {
+                                        LogicalVariable newVar = context.newVar();
+                                        // replace one occurrence of vars(i) in exp
+                                        substituteVarOnce(exp, vars.get(i), newVar);
+                                        VariableReferenceExpression oldvarExpr =
+                                                new VariableReferenceExpression(vars.get(i));
+                                        AssignOperator assign =
+                                                new AssignOperator(newVar, new MutableObject<>(oldvarExpr));
+                                        // Now add an assign to the joinLeafInput : newvar <-- oldvar
+                                        assign.getInputs().add(new MutableObject<>(joinLeafInput));
+                                        context.computeAndSetTypeEnvironmentForOperator(assign);
+                                        context.addNotToBeInlinedVar(newVar);
+                                        context.addNotToBeInlinedVar(vars.get(i));
+
+                                        // also update the joinLeafInputsHashMap
+                                        joinLeafInputsHashMap.put(ets, assign);
+                                        changes = true;
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+            // now traverse left and right side plans
+            int leftIndex = plan.getLeftPlanIndex();
+            int rightIndex = plan.getRightPlanIndex();
+            PlanNode leftPlan = allPlans.get(leftIndex);
+            PlanNode rightPlan = allPlans.get(rightIndex);
+            if (leftPlan.IsJoinNode()) {
+                checkForMultipleUsesOfVariablesInJoinPreds(leftPlan, joinLeafInputsHashMap, context);
+            }
+            if (rightPlan.IsJoinNode()) {
+                checkForMultipleUsesOfVariablesInJoinPreds(rightPlan, joinLeafInputsHashMap, context);
+            }
+        }
+    }
+
+    private boolean substituteVarOnce(ILogicalExpression exp, LogicalVariable oldVar, LogicalVariable newVar) {
+        switch (exp.getExpressionTag()) {
+            case FUNCTION_CALL:
+                AbstractFunctionCallExpression fun = (AbstractFunctionCallExpression) exp;
+                for (int i = 0; i < fun.getArguments().size(); i++) {
+                    ILogicalExpression arg = fun.getArguments().get(i).getValue();
+                    if (substituteVarOnce(arg, oldVar, newVar)) {
+                        return true;
+                    }
+                }
+                return false;
+            case VARIABLE:
+                VariableReferenceExpression varExpr = (VariableReferenceExpression) exp;
+                if (varExpr.getVariableReference().equals(oldVar)) {
+                    varExpr.setVariable(newVar);
+                    return true;
+                }
+                return false;
+            default:
+                return false;
+        }
+    }
+
+    // check to see if every dataset has a sample. If not, CBO code cannot run. A warning message must be issued as well.
+    private boolean doAllDataSourcesHaveSamples(
+            List<Pair<EmptyTupleSourceOperator, DataSourceScanOperator>> emptyTupleAndDataSourceOps,
+            IOptimizationContext context) throws AlgebricksException {
+        for (int i = 0; i < emptyTupleAndDataSourceOps.size(); i++) {
+            if (emptyTupleAndDataSourceOps.get(i).getSecond() != null) {
+                DataSourceScanOperator scanOp = emptyTupleAndDataSourceOps.get(i).getSecond();
+                Index index = joinEnum.getStatsHandle().findSampleIndex(scanOp, context);
+                if (index == null) {
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+}
diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/cbo/EstimatedCostComputationVisitor.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/cbo/EstimatedCostComputationVisitor.java
new file mode 100644
index 0000000..9b9fd28
--- /dev/null
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/cbo/EstimatedCostComputationVisitor.java
@@ -0,0 +1,352 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.asterix.optimizer.rules.cbo;
+
+import java.util.Map;
+
+import org.apache.hyracks.algebricks.common.exceptions.AlgebricksException;
+import org.apache.hyracks.algebricks.common.utils.Pair;
+import org.apache.hyracks.algebricks.core.algebra.base.ILogicalOperator;
+import org.apache.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
+import org.apache.hyracks.algebricks.core.algebra.base.OperatorAnnotations;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.AggregateOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.AssignOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.DataSourceScanOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.DelegateOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.DistinctOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.DistributeResultOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.EmptyTupleSourceOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.ExchangeOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.ForwardOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.GroupByOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.IndexInsertDeleteUpsertOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.InnerJoinOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.InsertDeleteUpsertOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.IntersectOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.LeftOuterJoinOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.LeftOuterUnnestMapOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.LeftOuterUnnestOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.LimitOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.MaterializeOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.NestedTupleSourceOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.OrderOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.ProjectOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.ReplicateOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.RunningAggregateOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.ScriptOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.SelectOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.SinkOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.SplitOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.SubplanOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.TokenizeOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.UnionAllOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.UnnestMapOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.UnnestOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.WindowOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.WriteOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.WriteResultOperator;
+import org.apache.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
+
+/**
+ * A visitor that annotates an operator with its estimated cardinality and estimated cost.
+ */
+public class EstimatedCostComputationVisitor implements ILogicalOperatorVisitor<Pair<Double, Double>, Double> {
+
+    public EstimatedCostComputationVisitor() {
+    }
+
+    @Override
+    public Pair<Double, Double> visitAggregateOperator(AggregateOperator op, Double arg) throws AlgebricksException {
+        return annotate(this, op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitRunningAggregateOperator(RunningAggregateOperator op, Double arg)
+            throws AlgebricksException {
+        return annotate(this, op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitEmptyTupleSourceOperator(EmptyTupleSourceOperator op, Double arg)
+            throws AlgebricksException {
+        // Empty tuple source operator sends an empty tuple to downstream operators.
+        return new Pair<>(1.0, 1.0);
+    }
+
+    @Override
+    public Pair<Double, Double> visitGroupByOperator(GroupByOperator op, Double arg) throws AlgebricksException {
+        // Needs more work in the cardinality estimation code to estimate group by cardinality and cost.
+        return annotate(this, op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitLimitOperator(LimitOperator op, Double arg) throws AlgebricksException {
+        return annotate(this, op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitInnerJoinOperator(InnerJoinOperator op, Double arg) throws AlgebricksException {
+        return visitInnerJoin(op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitLeftOuterJoinOperator(LeftOuterJoinOperator op, Double arg)
+            throws AlgebricksException {
+        return visitLeftOuterUnnest(op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitNestedTupleSourceOperator(NestedTupleSourceOperator op, Double arg)
+            throws AlgebricksException {
+        Pair<Double, Double> cardCost = annotate(this, op, arg);
+        return op.getDataSourceReference().getValue().getOperatorTag() == LogicalOperatorTag.SUBPLAN ? cardCost
+                : new Pair<>(0.0, 0.0);
+    }
+
+    @Override
+    public Pair<Double, Double> visitOrderOperator(OrderOperator op, Double arg) throws AlgebricksException {
+        return annotate(this, op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitAssignOperator(AssignOperator op, Double arg) throws AlgebricksException {
+        return annotate(this, op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitWindowOperator(WindowOperator op, Double arg) throws AlgebricksException {
+        return annotate(this, op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitSelectOperator(SelectOperator op, Double arg) throws AlgebricksException {
+        Pair<Double, Double> cardCost = op.getInputs().get(0).getValue().accept(this, arg);
+        for (Map.Entry<String, Object> anno : op.getAnnotations().entrySet()) {
+            if (anno.getValue() != null && anno.getKey().equals(OperatorAnnotations.OP_OUTPUT_CARDINALITY)) {
+                cardCost.setFirst((Double) anno.getValue());
+            } else if (anno.getValue() != null && anno.getKey().equals(OperatorAnnotations.OP_COST_TOTAL)) {
+                cardCost.setSecond((Double) anno.getValue());
+            }
+        }
+
+        return cardCost;
+    }
+
+    @Override
+    public Pair<Double, Double> visitDelegateOperator(DelegateOperator op, Double arg) throws AlgebricksException {
+        return annotate(this, op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitProjectOperator(ProjectOperator op, Double arg) throws AlgebricksException {
+        return annotate(this, op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitReplicateOperator(ReplicateOperator op, Double arg) throws AlgebricksException {
+        return annotate(this, op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitSplitOperator(SplitOperator op, Double arg) throws AlgebricksException {
+        return annotate(this, op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitMaterializeOperator(MaterializeOperator op, Double arg)
+            throws AlgebricksException {
+        return annotate(this, op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitScriptOperator(ScriptOperator op, Double arg) throws AlgebricksException {
+        return annotate(this, op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitSubplanOperator(SubplanOperator op, Double arg) throws AlgebricksException {
+        return annotate(this, op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitSinkOperator(SinkOperator op, Double arg) throws AlgebricksException {
+        return annotate(this, op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitUnionOperator(UnionAllOperator op, Double arg) throws AlgebricksException {
+        // Needs more work.
+        return annotate(this, op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitUnnestOperator(UnnestOperator op, Double arg) throws AlgebricksException {
+        return annotate(this, op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitLeftOuterUnnestOperator(LeftOuterUnnestOperator op, Double arg)
+            throws AlgebricksException {
+        return visitLeftOuterUnnest(op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitUnnestMapOperator(UnnestMapOperator op, Double arg) throws AlgebricksException {
+        return annotate(this, op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitLeftOuterUnnestMapOperator(LeftOuterUnnestMapOperator op, Double arg)
+            throws AlgebricksException {
+        return visitLeftOuterUnnest(op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitDataScanOperator(DataSourceScanOperator op, Double arg)
+            throws AlgebricksException {
+        Pair<Double, Double> cardCost = new Pair<>(1.0, 1.0);
+
+        for (Map.Entry<String, Object> anno : op.getAnnotations().entrySet()) {
+            if (anno.getValue() != null && anno.getKey().equals(OperatorAnnotations.OP_INPUT_CARDINALITY)) {
+                cardCost.setFirst((Double) anno.getValue());
+            } else if (anno.getValue() != null && anno.getKey().equals(OperatorAnnotations.OP_COST_TOTAL)) {
+                cardCost.setSecond((Double) anno.getValue());
+            }
+        }
+
+        return cardCost;
+    }
+
+    @Override
+    public Pair<Double, Double> visitDistinctOperator(DistinctOperator op, Double arg) throws AlgebricksException {
+        return annotate(this, op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitExchangeOperator(ExchangeOperator op, Double arg) throws AlgebricksException {
+        double exchCost = 0;
+        if (arg != null) {
+            exchCost = arg;
+        }
+
+        Pair<Double, Double> cardCost = op.getInputs().get(0).getValue().accept(this, arg);
+        if (exchCost != 0) {
+            op.getAnnotations().put(OperatorAnnotations.OP_COST_LOCAL, exchCost);
+            op.getAnnotations().put(OperatorAnnotations.OP_COST_TOTAL, exchCost + cardCost.getSecond());
+        } else {
+            op.getAnnotations().put(OperatorAnnotations.OP_COST_LOCAL, cardCost.getSecond());
+            op.getAnnotations().put(OperatorAnnotations.OP_COST_TOTAL, cardCost.getSecond());
+        }
+        op.getAnnotations().put(OperatorAnnotations.OP_OUTPUT_CARDINALITY, cardCost.getFirst());
+        return cardCost;
+    }
+
+    @Override
+    public Pair<Double, Double> visitWriteOperator(WriteOperator op, Double arg) throws AlgebricksException {
+        return annotate(this, op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitDistributeResultOperator(DistributeResultOperator op, Double arg)
+            throws AlgebricksException {
+        return annotate(this, op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitWriteResultOperator(WriteResultOperator op, Double arg)
+            throws AlgebricksException {
+        return annotate(this, op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitInsertDeleteUpsertOperator(InsertDeleteUpsertOperator op, Double arg)
+            throws AlgebricksException {
+        return annotate(this, op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitIndexInsertDeleteUpsertOperator(IndexInsertDeleteUpsertOperator op, Double arg)
+            throws AlgebricksException {
+        return annotate(this, op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitTokenizeOperator(TokenizeOperator op, Double arg) throws AlgebricksException {
+        return annotate(this, op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitForwardOperator(ForwardOperator op, Double arg) throws AlgebricksException {
+        return annotate(this, op, arg);
+    }
+
+    @Override
+    public Pair<Double, Double> visitIntersectOperator(IntersectOperator op, Double arg) throws AlgebricksException {
+        // Needs more work.
+        return annotate(this, op, arg);
+    }
+
+    private static Pair<Double, Double> annotate(EstimatedCostComputationVisitor visitor, ILogicalOperator op,
+            Double arg) throws AlgebricksException {
+        if (op.getInputs().isEmpty()) {
+            return new Pair<>(1.0, 1.0);
+        }
+        Pair<Double, Double> cardCost = op.getInputs().get(0).getValue().accept(visitor, arg);
+        op.getAnnotations().put(OperatorAnnotations.OP_OUTPUT_CARDINALITY, cardCost.getFirst());
+        op.getAnnotations().put(OperatorAnnotations.OP_COST_TOTAL, cardCost.getSecond());
+        op.getAnnotations().put(OperatorAnnotations.OP_COST_LOCAL, cardCost.getSecond());
+        return cardCost;
+    }
+
+    // Visits an operator that has the left outer semantics, e.g.,
+    // left outer join, left outer unnest, left outer unnest map.
+    private Pair<Double, Double> visitLeftOuterUnnest(ILogicalOperator operator, Double arg)
+            throws AlgebricksException {
+        // Needs more work.
+        return operator.getInputs().get(0).getValue().accept(this, arg);
+    }
+
+    // Visits an inner join operator, particularly, deals with the case the join is a cartesian product.
+    private Pair<Double, Double> visitInnerJoin(InnerJoinOperator joinOperator, Double arg) throws AlgebricksException {
+        Pair<Double, Double> cardCost = new Pair<>(1.0, 1.0);
+
+        ILogicalOperator left = joinOperator.getInputs().get(0).getValue();
+        ILogicalOperator right = joinOperator.getInputs().get(1).getValue();
+        double leftExchangeCost = 0;
+        double rightExchangeCost = 0;
+
+        for (Map.Entry<String, Object> anno : joinOperator.getAnnotations().entrySet()) {
+            if (anno.getValue() != null && anno.getKey().equals(OperatorAnnotations.OP_OUTPUT_CARDINALITY)) {
+                cardCost.setFirst((Double) anno.getValue());
+            } else if (anno.getValue() != null && anno.getKey().equals(OperatorAnnotations.OP_COST_TOTAL)) {
+                cardCost.setSecond((Double) anno.getValue());
+            } else if (anno.getValue() != null && anno.getKey().equals(OperatorAnnotations.OP_LEFT_EXCHANGE_COST)) {
+                leftExchangeCost = (double) anno.getValue();
+            } else if (anno.getValue() != null && anno.getKey().equals(OperatorAnnotations.OP_RIGHT_EXCHANGE_COST)) {
+                rightExchangeCost = (double) anno.getValue();
+            }
+        }
+
+        // Visit the left and right branches.
+        left.accept(this, leftExchangeCost);
+        right.accept(this, rightExchangeCost);
+
+        return cardCost;
+    }
+}
diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/cbo/JoinCondition.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/cbo/JoinCondition.java
new file mode 100644
index 0000000..bc7ea3f
--- /dev/null
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/cbo/JoinCondition.java
@@ -0,0 +1,49 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.asterix.optimizer.rules.cbo;
+
+import org.apache.hyracks.algebricks.core.algebra.base.ILogicalExpression;
+
+public class JoinCondition {
+
+    public static final int NO_JC = -1;
+
+    public ILogicalExpression joinCondition;
+    public boolean derived = false;
+    public boolean partOfComposite = false;
+    public int numberOfVars = 0; // how many variables
+    public int componentNumber = 0; // for identifying if join graph is connected
+    public int datasetBits;
+    // used for triangle detection; we strictly do not mean left and right here.
+    // first and second sides would be more appropriate
+    public int leftSideBits;
+    public int rightSideBits;
+    public double selectivity;
+    public comparisonOp comparisonType;
+
+    public enum comparisonOp {
+        OP_EQ,
+        OP_OTHER
+    }
+
+    public ILogicalExpression getJoinCondition() {
+        return joinCondition;
+    }
+}
diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/cbo/JoinEnum.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/cbo/JoinEnum.java
new file mode 100644
index 0000000..f47e577
--- /dev/null
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/cbo/JoinEnum.java
@@ -0,0 +1,781 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.asterix.optimizer.rules.cbo;
+
+import java.time.LocalDateTime;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import org.apache.asterix.common.annotations.IndexedNLJoinExpressionAnnotation;
+import org.apache.asterix.metadata.declared.DataSource;
+import org.apache.asterix.metadata.declared.DataSourceId;
+import org.apache.asterix.metadata.entities.Index;
+import org.apache.asterix.om.base.AOrderedList;
+import org.apache.asterix.om.base.IAObject;
+import org.apache.asterix.om.constants.AsterixConstantValue;
+import org.apache.asterix.om.functions.BuiltinFunctions;
+import org.apache.asterix.om.types.ATypeTag;
+import org.apache.asterix.optimizer.cost.Cost;
+import org.apache.asterix.optimizer.cost.CostMethods;
+import org.apache.asterix.optimizer.cost.ICost;
+import org.apache.asterix.optimizer.cost.ICostMethods;
+import org.apache.commons.lang3.mutable.Mutable;
+import org.apache.commons.lang3.mutable.MutableObject;
+import org.apache.hyracks.algebricks.common.exceptions.AlgebricksException;
+import org.apache.hyracks.algebricks.common.utils.Pair;
+import org.apache.hyracks.algebricks.core.algebra.base.ILogicalExpression;
+import org.apache.hyracks.algebricks.core.algebra.base.ILogicalOperator;
+import org.apache.hyracks.algebricks.core.algebra.base.IOptimizationContext;
+import org.apache.hyracks.algebricks.core.algebra.base.LogicalExpressionTag;
+import org.apache.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
+import org.apache.hyracks.algebricks.core.algebra.base.LogicalVariable;
+import org.apache.hyracks.algebricks.core.algebra.expressions.AbstractFunctionCallExpression;
+import org.apache.hyracks.algebricks.core.algebra.expressions.BroadcastExpressionAnnotation;
+import org.apache.hyracks.algebricks.core.algebra.expressions.ConstantExpression;
+import org.apache.hyracks.algebricks.core.algebra.expressions.HashJoinExpressionAnnotation;
+import org.apache.hyracks.algebricks.core.algebra.expressions.ScalarFunctionCallExpression;
+import org.apache.hyracks.algebricks.core.algebra.expressions.UnnestingFunctionCallExpression;
+import org.apache.hyracks.algebricks.core.algebra.functions.AlgebricksBuiltinFunctions;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.AbstractBinaryJoinOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.AssignOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.DataSourceScanOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.EmptyTupleSourceOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.InnerJoinOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.UnnestOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.visitors.VariableUtilities;
+import org.apache.hyracks.algebricks.core.algebra.prettyprint.IPlanPrettyPrinter;
+import org.apache.hyracks.algebricks.core.algebra.util.OperatorManipulationUtil;
+import org.apache.hyracks.algebricks.core.rewriter.base.CardHints;
+import org.apache.hyracks.algebricks.core.rewriter.base.PhysicalOptimizationConfig;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+public class JoinEnum {
+
+    private static final Logger LOGGER = LogManager.getLogger();
+
+    protected List<JoinCondition> joinConditions; // "global" list of join conditions
+    protected List<PlanNode> allPlans; // list of all plans
+    protected JoinNode[] jnArray; // array of all join nodes
+    protected int jnArraySize;
+    protected CardHints cardHints; // cardinality hints
+    protected List<Pair<EmptyTupleSourceOperator, DataSourceScanOperator>> emptyTupleAndDataSourceOps;
+    protected Map<EmptyTupleSourceOperator, ILogicalOperator> joinLeafInputsHashMap;
+    protected Map<DataSourceScanOperator, EmptyTupleSourceOperator> dataSourceEmptyTupleHashMap;
+    protected List<ILogicalExpression> singleDatasetPreds;
+    protected List<ILogicalOperator> internalEdges;
+    protected List<ILogicalOperator> joinOps;
+    protected ILogicalOperator localJoinOp; // used in nestedLoopsApplicable code.
+    protected IOptimizationContext optCtx;
+    protected Stats stats;
+    protected PhysicalOptimizationConfig physOptConfig;
+    protected boolean cboMode;
+    protected boolean cboTestMode;
+    protected int numberOfTerms;
+    protected AbstractLogicalOperator op;
+    protected boolean connectedJoinGraph;
+    protected boolean forceJoinOrderMode;
+    protected String queryPlanShape;
+    protected ICost cost;
+    protected ICostMethods costMethods;
+
+    public JoinEnum() {
+        singleDatasetPreds = new ArrayList<>();
+    }
+
+    public void initEnum(AbstractLogicalOperator op, boolean cboMode, boolean cboTestMode, int numberOfFromTerms,
+            List<Pair<EmptyTupleSourceOperator, DataSourceScanOperator>> emptyTupleAndDataSourceOps,
+            Map<EmptyTupleSourceOperator, ILogicalOperator> joinLeafInputsHashMap,
+            Map<DataSourceScanOperator, EmptyTupleSourceOperator> dataSourceEmptyTupleHashMap,
+            List<ILogicalOperator> internalEdges, List<ILogicalOperator> joinOps, CardHints cardHints,
+            IOptimizationContext context) {
+        this.joinConditions = new ArrayList<>();
+        this.internalEdges = new ArrayList<>();
+        this.allPlans = new ArrayList<>();
+        this.numberOfTerms = numberOfFromTerms;
+        this.cboMode = cboMode;
+        this.cboTestMode = cboTestMode;
+        this.cardHints = cardHints;
+        this.connectedJoinGraph = true;
+        this.optCtx = context;
+        this.physOptConfig = context.getPhysicalOptimizationConfig();
+        this.emptyTupleAndDataSourceOps = emptyTupleAndDataSourceOps;
+        this.joinLeafInputsHashMap = joinLeafInputsHashMap;
+        this.dataSourceEmptyTupleHashMap = dataSourceEmptyTupleHashMap;
+        this.internalEdges = internalEdges;
+        this.joinOps = joinOps;
+        this.op = op;
+        this.forceJoinOrderMode = getForceJoinOrderMode(context);
+        this.queryPlanShape = getQueryPlanShape(context);
+        initCostHandleAndJoinNodes(context);
+    }
+
+    protected void initCostHandleAndJoinNodes(IOptimizationContext context) {
+        this.cost = new Cost();
+        this.costMethods = new CostMethods(context);
+        this.stats = new Stats(optCtx, this);
+        this.jnArraySize = (int) Math.pow(2.0, this.numberOfTerms);
+        this.jnArray = new JoinNode[this.jnArraySize];
+        // initialize all the join nodes
+        for (int i = 0; i < this.jnArraySize; i++) {
+            this.jnArray[i] = new JoinNode(i, this);
+        }
+    }
+
+    public List<JoinCondition> getJoinConditions() {
+        return joinConditions;
+    }
+
+    public List<PlanNode> getAllPlans() {
+        return allPlans;
+    }
+
+    public JoinNode[] getJnArray() {
+        return jnArray;
+    }
+
+    public Cost getCostHandle() {
+        return (Cost) cost;
+    }
+
+    public CostMethods getCostMethodsHandle() {
+        return (CostMethods) costMethods;
+    }
+
+    public Stats getStatsHandle() {
+        return stats;
+    }
+
+    public Map<EmptyTupleSourceOperator, ILogicalOperator> getJoinLeafInputsHashMap() {
+        return joinLeafInputsHashMap;
+    }
+
+    public Map<DataSourceScanOperator, EmptyTupleSourceOperator> getDataSourceEmptyTupleHashMap() {
+        return dataSourceEmptyTupleHashMap;
+    }
+
+    public ILogicalOperator findLeafInput(List<LogicalVariable> logicalVars) throws AlgebricksException {
+        Set<LogicalVariable> vars = new HashSet<>();
+        for (int pos = 0; pos < emptyTupleAndDataSourceOps.size(); pos++) {
+            EmptyTupleSourceOperator emptyOp = emptyTupleAndDataSourceOps.get(pos).getFirst();
+            ILogicalOperator op = joinLeafInputsHashMap.get(emptyOp);
+            vars.clear();
+            // this is expensive to do. So store this once and reuse
+            VariableUtilities.getLiveVariables(op, vars);
+            if (vars.containsAll(logicalVars)) {
+                return op;
+            }
+        }
+        // this will never happen, but keep compiler happy
+        return null;
+    }
+
+    public ILogicalExpression combineAllConditions(List<Integer> newJoinConditions) {
+        if (newJoinConditions.size() == 0) {
+            // this is a cartesian product
+            return ConstantExpression.TRUE;
+        }
+        if (newJoinConditions.size() == 1) {
+            JoinCondition jc = joinConditions.get(newJoinConditions.get(0));
+            return jc.joinCondition;
+        }
+        ScalarFunctionCallExpression andExpr = new ScalarFunctionCallExpression(
+                BuiltinFunctions.getBuiltinFunctionInfo(AlgebricksBuiltinFunctions.AND));
+
+        for (int joinNum : newJoinConditions) {
+            // Need to AND all the expressions.
+            JoinCondition jc = joinConditions.get(joinNum);
+            andExpr.getArguments().add(new MutableObject<>(jc.joinCondition));
+        }
+        return andExpr;
+    }
+
+    public ILogicalExpression getNestedLoopJoinExpr(List<Integer> newJoinConditions) {
+        if (newJoinConditions.size() != 1) {
+            // may remove this restriction later if possible
+            return null;
+        }
+        JoinCondition jc = joinConditions.get(newJoinConditions.get(0));
+        return jc.joinCondition;
+    }
+
+    public ILogicalExpression getHashJoinExpr(List<Integer> newJoinConditions) {
+        if (newJoinConditions.size() == 0) {
+            // this is a cartesian product
+            return ConstantExpression.TRUE;
+        }
+        if (newJoinConditions.size() == 1) {
+            JoinCondition jc = joinConditions.get(newJoinConditions.get(0));
+            if (jc.comparisonType == JoinCondition.comparisonOp.OP_EQ) {
+                return jc.joinCondition;
+            }
+            return null;
+        }
+        ScalarFunctionCallExpression andExpr = new ScalarFunctionCallExpression(
+                BuiltinFunctions.getBuiltinFunctionInfo(AlgebricksBuiltinFunctions.AND));
+
+        // at least one equality predicate needs to be present for a hash join to be possible.
+        boolean eqPredFound = false;
+        for (int joinNum : newJoinConditions) {
+            // need to AND all the expressions.
+            JoinCondition jc = joinConditions.get(joinNum);
+            if (jc.comparisonType == JoinCondition.comparisonOp.OP_EQ) {
+                eqPredFound = true;
+            }
+            andExpr.getArguments().add(new MutableObject<>(jc.joinCondition));
+        }
+        // return null if no equality predicates were found
+        return eqPredFound ? andExpr : null;
+    }
+
+    public HashJoinExpressionAnnotation.BuildSide findHashJoinHint(List<Integer> newJoinConditions) {
+        for (int i : newJoinConditions) {
+            JoinCondition jc = joinConditions.get(i);
+            if (jc.comparisonType != JoinCondition.comparisonOp.OP_EQ) {
+                return null;
+            }
+            ILogicalExpression expr = jc.joinCondition;
+            if (expr.getExpressionTag().equals(LogicalExpressionTag.FUNCTION_CALL)) {
+                AbstractFunctionCallExpression AFCexpr = (AbstractFunctionCallExpression) expr;
+                HashJoinExpressionAnnotation hjea = AFCexpr.getAnnotation(HashJoinExpressionAnnotation.class);
+                if (hjea != null) {
+                    return hjea.getBuildSide();
+                }
+            }
+        }
+        return null;
+    }
+
+    public BroadcastExpressionAnnotation.BroadcastSide findBroadcastHashJoinHint(List<Integer> newJoinConditions) {
+        for (int i : newJoinConditions) {
+            JoinCondition jc = joinConditions.get(i);
+            if (jc.comparisonType != JoinCondition.comparisonOp.OP_EQ) {
+                return null;
+            }
+            ILogicalExpression expr = jc.joinCondition;
+            if (expr.getExpressionTag().equals(LogicalExpressionTag.FUNCTION_CALL)) {
+                AbstractFunctionCallExpression AFCexpr = (AbstractFunctionCallExpression) expr;
+                BroadcastExpressionAnnotation bcasthjea = AFCexpr.getAnnotation(BroadcastExpressionAnnotation.class);
+                if (bcasthjea != null) {
+                    return bcasthjea.getBroadcastSide();
+                }
+            }
+        }
+        return null;
+    }
+
+    public boolean findNLJoinHint(List<Integer> newJoinConditions) {
+        for (int i : newJoinConditions) {
+            JoinCondition jc = joinConditions.get(i);
+            ILogicalExpression expr = jc.joinCondition;
+            if (expr.getExpressionTag().equals(LogicalExpressionTag.FUNCTION_CALL)) {
+                AbstractFunctionCallExpression AFCexpr = (AbstractFunctionCallExpression) expr;
+                IndexedNLJoinExpressionAnnotation inljea =
+                        AFCexpr.getAnnotation(IndexedNLJoinExpressionAnnotation.class);
+                if (inljea != null) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+
+    public int findJoinNodeIndexByName(String name) {
+        for (int i = 1; i <= this.numberOfTerms; i++) {
+            if (name.equals(jnArray[i].datasetNames.get(0))) {
+                return i;
+            } else if (name.equals(jnArray[i].alias)) {
+                return i;
+            }
+        }
+        // should never happen; keep compiler happy.
+        return JoinNode.NO_JN;
+    }
+
+    public int findJoinNodeIndex(LogicalVariable lv) throws AlgebricksException {
+        List<Pair<EmptyTupleSourceOperator, DataSourceScanOperator>> emptyTupleAndDataSourceOps =
+                this.emptyTupleAndDataSourceOps;
+        Map<EmptyTupleSourceOperator, ILogicalOperator> joinLeafInputsHashMap = this.joinLeafInputsHashMap;
+
+        for (Map.Entry<EmptyTupleSourceOperator, ILogicalOperator> mapElement : joinLeafInputsHashMap.entrySet()) {
+            ILogicalOperator joinLeafInput = mapElement.getValue();
+            HashSet<LogicalVariable> vars = new HashSet<>();
+            // this should get the variables from the inputs only, since the join condition is itself set to null
+            VariableUtilities.getLiveVariables(joinLeafInput, vars);
+            if (vars.contains(lv)) {
+                EmptyTupleSourceOperator key = mapElement.getKey();
+                for (int i = 0; i < emptyTupleAndDataSourceOps.size(); i++) {
+                    if (key.equals(emptyTupleAndDataSourceOps.get(i).getFirst())) {
+                        return i;
+                    }
+                }
+            }
+        }
+        return JoinNode.NO_JN;
+    }
+
+    private int findBits(LogicalVariable lv) throws AlgebricksException {
+        int idx = findJoinNodeIndex(lv);
+        if (idx >= 0) {
+            return 1 << idx;
+        }
+
+        // so this variable must be in an internal edge in an assign statement. Find the RHS variables there
+        for (ILogicalOperator op : this.internalEdges) {
+            if (op.getOperatorTag() == LogicalOperatorTag.ASSIGN) {
+                List<LogicalVariable> vars2 = new ArrayList<>();
+                VariableUtilities.getUsedVariables(op, vars2);
+                int bits = 0;
+                for (LogicalVariable lv2 : vars2) {
+                    bits |= findBits(lv2);
+                }
+                return bits;
+            }
+        }
+        // should never reach this because every variable must exist in some leaf input.
+        return JoinNode.NO_JN;
+    }
+
+    // This finds all the join Conditions in the whole query. This is a global list of all join predicates.
+    // It also fills in the dataset Bits for each join predicate.
+    protected void findJoinConditions() throws AlgebricksException {
+        List<Mutable<ILogicalExpression>> conjs = new ArrayList<>();
+        for (ILogicalOperator jOp : joinOps) {
+            AbstractBinaryJoinOperator joinOp = (AbstractBinaryJoinOperator) jOp;
+            ILogicalExpression expr = joinOp.getCondition().getValue();
+            conjs.clear();
+            if (expr.splitIntoConjuncts(conjs)) {
+                conjs.remove(new MutableObject<ILogicalExpression>(ConstantExpression.TRUE));
+                for (Mutable<ILogicalExpression> conj : conjs) {
+                    JoinCondition jc = new JoinCondition();
+                    jc.joinCondition = conj.getValue().cloneExpression();
+                    joinConditions.add(jc);
+                    jc.selectivity = stats.getSelectivityFromAnnotationMain(jc.joinCondition, true);
+                }
+            } else {
+                if ((expr.getExpressionTag().equals(LogicalExpressionTag.FUNCTION_CALL))) {
+                    JoinCondition jc = new JoinCondition();
+                    // change to not a true condition
+                    jc.joinCondition = expr.cloneExpression();
+                    joinConditions.add(jc);
+                    jc.selectivity = stats.getSelectivityFromAnnotationMain(jc.joinCondition, true);
+                }
+            }
+        }
+
+        // now patch up any join conditions that have variables referenced in any internal assign statements.
+        List<LogicalVariable> usedVars = new ArrayList<>();
+        for (JoinCondition jc : joinConditions) {
+            usedVars.clear();
+            ILogicalExpression expr = jc.joinCondition;
+            expr.getUsedVariables(usedVars);
+            for (ILogicalOperator ie : internalEdges) {
+                AssignOperator aOp = (AssignOperator) ie;
+                for (int i = 0; i < aOp.getVariables().size(); i++) {
+                    if (usedVars.contains(aOp.getVariables().get(i))) {
+                        OperatorManipulationUtil.replaceVarWithExpr((AbstractFunctionCallExpression) expr,
+                                aOp.getVariables().get(i), aOp.getExpressions().get(i).getValue());
+                        jc.joinCondition = expr;
+                        jc.selectivity = stats.getSelectivityFromAnnotationMain(jc.joinCondition, true);
+                    }
+                }
+            }
+        }
+
+        // now fill the datasetBits for each join condition.
+        for (JoinCondition jc : joinConditions) {
+            ILogicalExpression joinExpr = jc.joinCondition;
+            /*
+            if (joinExpr.getExpressionTag().equals(LogicalExpressionTag.FUNCTION_CALL)) {
+                AbstractFunctionCallExpression afce = (AbstractFunctionCallExpression) joinExpr;
+                // remove all the join method type annotations.
+                afce.removeAnnotation(BroadcastExpressionAnnotation.class);
+                afce.removeAnnotation(IndexedNLJoinExpressionAnnotation.class);
+                afce.removeAnnotation(HashJoinExpressionAnnotation.class);
+            }
+             */
+            usedVars.clear();
+            joinExpr.getUsedVariables(usedVars);
+            // We only set these for join predicates that have exactly two tables
+            jc.leftSideBits = jc.rightSideBits = JoinCondition.NO_JC;
+            if (((AbstractFunctionCallExpression) joinExpr).getFunctionIdentifier()
+                    .equals(AlgebricksBuiltinFunctions.EQ)) {
+                jc.comparisonType = JoinCondition.comparisonOp.OP_EQ;
+            } else {
+                jc.comparisonType = JoinCondition.comparisonOp.OP_OTHER;
+            }
+            jc.numberOfVars = usedVars.size();
+
+            for (int i = 0; i < jc.numberOfVars; i++) {
+                int bits = findBits(usedVars.get(i)); // rename to findInWhichLeaf
+                if (bits != JoinCondition.NO_JC) {
+                    if (i == 0) {
+                        jc.leftSideBits = bits;
+                    } else if (i == 1) {
+                        jc.rightSideBits = bits;
+                    } else {
+                        // have to deal with preds such as r.a + s.a = 5 OR r.a + s.a = t.a
+                    }
+                    jc.datasetBits |= bits;
+                }
+            }
+        }
+    }
+
+    // in case we have l.partkey = ps.partkey and l.suppkey = ps.suppkey, we will only use the first one for cardinality computations.
+    // treat it like a Pk-Fk join; simplifies cardinality computation
+    private void markCompositeJoinPredicates() {
+        // can use dataSetBits??? This will be simpler.
+        for (int i = 0; i < joinConditions.size() - 1; i++) {
+            for (int j = i + 1; j < joinConditions.size(); j++) {
+                if (joinConditions.get(i).datasetBits == joinConditions.get(j).datasetBits) {
+                    joinConditions.get(j).partOfComposite = true;
+                }
+            }
+        }
+    }
+
+    private boolean verticesMatch(JoinCondition jc1, JoinCondition jc2) {
+        return jc1.leftSideBits == jc2.leftSideBits || jc1.leftSideBits == jc2.rightSideBits
+                || jc1.rightSideBits == jc2.leftSideBits || jc1.rightSideBits == jc2.rightSideBits;
+    }
+
+    private void markComponents(int startingJoinCondition) {
+        List<JoinCondition> joinConditions = this.getJoinConditions();
+        // see if all the joinCondition can be reached starting with the first.
+        JoinCondition jc1 = joinConditions.get(startingJoinCondition);
+        for (int i = 0; i < joinConditions.size(); i++) {
+            JoinCondition jc2 = joinConditions.get(i);
+            if (i != startingJoinCondition && jc2.componentNumber == 0) {
+                // a new edge not visited before
+                if (verticesMatch(jc1, jc2)) {
+                    jc2.componentNumber = 1;
+                    markComponents(i);
+                }
+            }
+        }
+    }
+
+    private void findIfJoinGraphIsConnected() {
+        int numJoinConditions = joinConditions.size();
+        if (numJoinConditions < numberOfTerms - 1) {
+            /// not enough join predicates
+            connectedJoinGraph = false;
+            return;
+        }
+        if (numJoinConditions > 0) {
+            joinConditions.get(0).componentNumber = 1;
+            markComponents(0);
+            for (int i = 1; i < numJoinConditions; i++) {
+                if (joinConditions.get(i).componentNumber == 0) {
+                    connectedJoinGraph = false;
+                    return;
+                }
+            }
+        }
+    }
+
+    private double findInListCard(ILogicalOperator op) {
+        if (op.getOperatorTag() == LogicalOperatorTag.ASSIGN) {
+            return 1.0;
+        }
+
+        if (op.getOperatorTag() == LogicalOperatorTag.UNNEST) {
+            UnnestOperator unnestOp = (UnnestOperator) op;
+            ILogicalExpression unnestExpr = unnestOp.getExpressionRef().getValue();
+            UnnestingFunctionCallExpression unnestingFuncExpr = (UnnestingFunctionCallExpression) unnestExpr;
+
+            if (unnestingFuncExpr.getFunctionIdentifier().equals(BuiltinFunctions.SCAN_COLLECTION)) {
+                if (unnestingFuncExpr.getArguments().get(0).getValue()
+                        .getExpressionTag() == LogicalExpressionTag.CONSTANT) {
+                    ConstantExpression constantExpr =
+                            (ConstantExpression) unnestingFuncExpr.getArguments().get(0).getValue();
+                    AsterixConstantValue constantValue = (AsterixConstantValue) constantExpr.getValue();
+                    IAObject v = constantValue.getObject();
+                    if (v.getType().getTypeTag() == ATypeTag.ARRAY) {
+                        AOrderedList array = (AOrderedList) v;
+                        return array.size();
+                    }
+                }
+            }
+        }
+        // just a guess
+        return 10.0;
+    }
+
+    private String findAlias(DataSourceScanOperator scanOp) {
+        DataSource ds = (DataSource) scanOp.getDataSource();
+        List<LogicalVariable> allVars = scanOp.getVariables();
+        LogicalVariable dataRecVarInScan = ds.getDataRecordVariable(allVars);
+        return dataRecVarInScan.toString().substring(2);
+    }
+
+    private int addNonBushyJoinNodes(int level, int jnNumber, int[] startJnAtLevel) throws AlgebricksException {
+        // adding joinNodes of level (2, 3, ..., numberOfTerms)
+        int startJnSecondLevel = startJnAtLevel[2];
+        int startJnPrevLevel = startJnAtLevel[level - 1];
+        int startJnNextLevel = startJnAtLevel[level];
+        int i, j, addPlansToThisJn;
+
+        // walking thru the previous level
+        for (i = startJnPrevLevel; i < startJnNextLevel; i++) {
+            JoinNode jnI = jnArray[i];
+            jnI.jnArrayIndex = i;
+            if (jnI.highestDatasetId == 0) {
+                // this jn can be skipped
+                continue;
+            }
+
+            // walk thru the first level here
+            for (j = 1; j < startJnSecondLevel; j++) {
+                if (level == 2 && i > j) {
+                    // don't want to generate x y and y x. we will do this in plan generation.
+                    continue;
+                }
+                JoinNode jnJ = jnArray[j];
+                jnJ.jnArrayIndex = j;
+                if ((jnI.datasetBits & jnJ.datasetBits) > 0) {
+                    // these already have some common table
+                    continue;
+                }
+                int newBits = jnI.datasetBits | jnJ.datasetBits;
+                JoinNode jnNewBits = jnArray[newBits];
+                jnNewBits.jnArrayIndex = newBits;
+                // visiting this join node for the first time
+                if (jnNewBits.jnIndex == 0) {
+                    jnNumber++;
+                    JoinNode jn = jnArray[jnNumber];
+                    jn.jnArrayIndex = jnNumber;
+                    // if we want to locate the joinNode num (say 33) which has tables 1, 2, and 5.
+                    // if these bits are turned on, we get 19. Then jn[19].jn_index will equal 33.
+                    // Then jn[33].highestKeyspaceId will equal 5
+                    // if this joinNode ever gets removed, then set jn[19].highestKeyspaceId = 0
+                    jn.datasetBits = newBits;
+                    jnNewBits.jnIndex = addPlansToThisJn = jnNumber;
+                    jn.level = level;
+                    jn.highestDatasetId = Math.max(jnI.highestDatasetId, j);
+
+                    jn.datasetIndexes = new ArrayList<>();
+                    jn.datasetIndexes.addAll(jnI.datasetIndexes);
+                    jn.datasetIndexes.addAll(jnJ.datasetIndexes);
+                    Collections.sort(jn.datasetIndexes);
+
+                    jn.datasetNames = new ArrayList<>();
+                    jn.datasetNames.addAll(jnI.datasetNames);
+                    jn.datasetNames.addAll(jnJ.datasetNames);
+                    Collections.sort(jn.datasetNames);
+                    jn.size = jnI.size + jnJ.size;
+                    jn.cardinality = jn.computeJoinCardinality();
+
+                } else {
+                    addPlansToThisJn = jnNewBits.jnIndex;
+                }
+
+                JoinNode jnIJ = jnArray[addPlansToThisJn];
+                jnIJ.jnArrayIndex = addPlansToThisJn;
+                jnIJ.addMultiDatasetPlans(jnI, jnJ, level);
+                if (forceJoinOrderMode) {
+                    break;
+                }
+            }
+            if (forceJoinOrderMode) {
+                break;
+            }
+        }
+
+        return jnNumber;
+    }
+
+    private int enumerateHigherLevelJoinNodes() throws AlgebricksException {
+        int jnNumber = this.numberOfTerms;
+        int[] firstJnAtLevel;
+        firstJnAtLevel = new int[numberOfTerms + 1];
+        firstJnAtLevel[1] = 1;
+        IPlanPrettyPrinter pp = optCtx.getPrettyPrinter();
+        // after implementing greedy plan, we can start at level 3;
+        int startLevel = 2;
+        if (LOGGER.isTraceEnabled()) {
+            EnumerateJoinsRule.printPlan(pp, op, "Original Whole plan in JN 4");
+        }
+        for (int level = startLevel; level <= numberOfTerms; level++) {
+            firstJnAtLevel[level] = jnNumber + 1;
+            jnNumber = addNonBushyJoinNodes(level, jnNumber, firstJnAtLevel);
+        }
+        if (LOGGER.isTraceEnabled()) {
+            EnumerateJoinsRule.printPlan(pp, op, "Original Whole plan in JN 5");
+        }
+        return jnNumber;
+    }
+
+    protected int enumerateBaseLevelJoinNodes() throws AlgebricksException {
+        int lastBaseLevelJnNum = initializeBaseLevelJoinNodes();
+        if (lastBaseLevelJnNum == PlanNode.NO_PLAN) {
+            return PlanNode.NO_PLAN;
+        }
+        int dataScanPlan = PlanNode.NO_PLAN;
+        for (int i = 1; i <= numberOfTerms; i++) {
+            JoinNode jn = jnArray[i];
+            EmptyTupleSourceOperator ets = emptyTupleAndDataSourceOps.get(i - 1).getFirst();
+            ILogicalOperator leafInput = joinLeafInputsHashMap.get(ets);
+            dataScanPlan = jn.addSingleDatasetPlans();
+            if (dataScanPlan == PlanNode.NO_PLAN) {
+                return PlanNode.NO_PLAN;
+            }
+            // We may not add any index plans, so need to check for NO_PLAN
+            jn.addIndexAccessPlans(leafInput);
+        }
+        return numberOfTerms;
+    }
+
+    protected int initializeBaseLevelJoinNodes() throws AlgebricksException {
+        // join nodes have been allocated in the JoinEnum
+        // add a dummy Plan Node; we do not want planNode at position 0 to be a valid plan
+        PlanNode pn = new PlanNode(0, this);
+        pn.jn = null;
+        pn.jnIndexes[0] = pn.jnIndexes[1] = JoinNode.NO_JN;
+        pn.planIndexes[0] = pn.planIndexes[1] = PlanNode.NO_PLAN;
+        pn.opCost = pn.totalCost = new Cost(0);
+        allPlans.add(pn);
+
+        boolean noCards = false;
+        // initialize the level 1 join nodes
+        for (int i = 1; i <= numberOfTerms; i++) {
+            JoinNode jn = jnArray[i];
+            jn.jnArrayIndex = i;
+            jn.datasetBits = 1 << (i - 1);
+            jn.datasetIndexes = new ArrayList<>(Collections.singleton(i));
+            EmptyTupleSourceOperator ets = emptyTupleAndDataSourceOps.get(i - 1).getFirst();
+            ILogicalOperator leafInput = joinLeafInputsHashMap.get(ets);
+
+            DataSourceScanOperator scanOp = emptyTupleAndDataSourceOps.get(i - 1).getSecond();
+            if (scanOp != null) {
+                DataSourceId id = (DataSourceId) scanOp.getDataSource().getId();
+                jn.alias = findAlias(scanOp);
+                jn.datasetNames = new ArrayList<>(Collections.singleton(id.getDatasourceName()));
+                Index.SampleIndexDetails idxDetails;
+                Index index = stats.findSampleIndex(scanOp, optCtx);
+                if (index != null) {
+                    idxDetails = (Index.SampleIndexDetails) index.getIndexDetails();
+                } else {
+                    idxDetails = null;
+                }
+
+                jn.idxDetails = idxDetails;
+                if (cboTestMode) {
+                    // to make asterix tests run
+                    jn.origCardinality = 1000000;
+                    jn.size = 500;
+                } else {
+                    if (idxDetails == null) {
+                        return PlanNode.NO_PLAN;
+                    }
+                    jn.setOrigCardinality(idxDetails.getSourceCardinality());
+                    jn.setAvgDocSize(idxDetails.getSourceAvgItemSize());
+                }
+                // multiply by the respective predicate selectivities
+                jn.cardinality = jn.origCardinality * stats.getSelectivity(leafInput, false);
+            } else {
+                // could be unnest or assign
+                jn.datasetNames = new ArrayList<>(Collections.singleton("unnestOrAssign"));
+                jn.origCardinality = jn.cardinality = findInListCard(leafInput);
+                // just a guess
+                jn.size = 10;
+            }
+
+            if (jn.origCardinality >= Cost.MAX_CARD) {
+                noCards = true;
+            }
+            jn.correspondingEmptyTupleSourceOp = emptyTupleAndDataSourceOps.get(i - 1).getFirst();
+            jn.highestDatasetId = i;
+            jn.level = 1;
+        }
+        if (noCards) {
+            return PlanNode.NO_PLAN;
+        }
+        return numberOfTerms;
+    }
+
+    // main entry point in this file
+    public int enumerateJoins() throws AlgebricksException {
+        // create a localJoinOp for use in calling existing nested loops code.
+        InnerJoinOperator dummyInput = new InnerJoinOperator(null, null, null);
+        localJoinOp = new InnerJoinOperator(new MutableObject<>(ConstantExpression.TRUE),
+                new MutableObject<>(dummyInput), new MutableObject<>(dummyInput));
+
+        int lastBaseLevelJnNum = enumerateBaseLevelJoinNodes();
+        if (lastBaseLevelJnNum == PlanNode.NO_PLAN) {
+            return PlanNode.NO_PLAN;
+        }
+
+        IPlanPrettyPrinter pp = optCtx.getPrettyPrinter();
+        if (LOGGER.isTraceEnabled()) {
+            EnumerateJoinsRule.printPlan(pp, op, "Original Whole plan in JN 1");
+        }
+
+        findJoinConditions();
+        findIfJoinGraphIsConnected();
+
+        if (LOGGER.isTraceEnabled()) {
+            EnumerateJoinsRule.printPlan(pp, op, "Original Whole plan in JN 2");
+        }
+
+        markCompositeJoinPredicates();
+        int lastJnNum = enumerateHigherLevelJoinNodes();
+        JoinNode lastJn = jnArray[lastJnNum];
+        if (LOGGER.isTraceEnabled()) {
+            EnumerateJoinsRule.printPlan(pp, op, "Original Whole plan in JN END");
+            dumpJoinNodes(lastJnNum);
+        }
+
+        // find the cheapest plan
+        int cheapestPlanIndex = lastJn.cheapestPlanIndex;
+        if (LOGGER.isTraceEnabled() && cheapestPlanIndex > 0) {
+            LOGGER.trace("Cheapest Plan is " + cheapestPlanIndex + " number of terms is " + numberOfTerms
+                    + " joinNodes " + lastJnNum);
+        }
+
+        return cheapestPlanIndex;
+    }
+
+    private void dumpJoinNodes(int numJoinNodes) {
+        LOGGER.trace(LocalDateTime.now());
+        for (int i = 1; i <= numJoinNodes; i++) {
+            JoinNode jn = jnArray[i];
+            LOGGER.trace(jn);
+        }
+        LOGGER.trace("Printing cost of all Final Plans");
+        jnArray[numJoinNodes].printCostOfAllPlans();
+    }
+
+    public static boolean getForceJoinOrderMode(IOptimizationContext context) {
+        PhysicalOptimizationConfig physOptConfig = context.getPhysicalOptimizationConfig();
+        return physOptConfig.getForceJoinOrderMode();
+    }
+
+    public static String getQueryPlanShape(IOptimizationContext context) {
+        PhysicalOptimizationConfig physOptConfig = context.getPhysicalOptimizationConfig();
+        return physOptConfig.getQueryPlanShapeMode();
+    }
+}
diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/cbo/JoinNode.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/cbo/JoinNode.java
new file mode 100644
index 0000000..d560a13
--- /dev/null
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/cbo/JoinNode.java
@@ -0,0 +1,879 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.asterix.optimizer.rules.cbo;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.TreeMap;
+
+import org.apache.asterix.common.annotations.SkipSecondaryIndexSearchExpressionAnnotation;
+import org.apache.asterix.metadata.entities.Index;
+import org.apache.asterix.om.functions.BuiltinFunctions;
+import org.apache.asterix.optimizer.cost.Cost;
+import org.apache.asterix.optimizer.cost.ICost;
+import org.apache.asterix.optimizer.rules.am.AccessMethodAnalysisContext;
+import org.apache.asterix.optimizer.rules.am.IAccessMethod;
+import org.apache.asterix.optimizer.rules.am.IOptimizableFuncExpr;
+import org.apache.asterix.optimizer.rules.am.IntroduceJoinAccessMethodRule;
+import org.apache.asterix.optimizer.rules.am.IntroduceSelectAccessMethodRule;
+import org.apache.commons.lang3.mutable.MutableObject;
+import org.apache.hyracks.algebricks.common.exceptions.AlgebricksException;
+import org.apache.hyracks.algebricks.common.utils.Pair;
+import org.apache.hyracks.algebricks.core.algebra.base.ILogicalExpression;
+import org.apache.hyracks.algebricks.core.algebra.base.ILogicalOperator;
+import org.apache.hyracks.algebricks.core.algebra.base.LogicalExpressionTag;
+import org.apache.hyracks.algebricks.core.algebra.base.LogicalVariable;
+import org.apache.hyracks.algebricks.core.algebra.expressions.AbstractFunctionCallExpression;
+import org.apache.hyracks.algebricks.core.algebra.expressions.BroadcastExpressionAnnotation;
+import org.apache.hyracks.algebricks.core.algebra.expressions.ConstantExpression;
+import org.apache.hyracks.algebricks.core.algebra.expressions.HashJoinExpressionAnnotation;
+import org.apache.hyracks.algebricks.core.algebra.expressions.PredicateCardinalityAnnotation;
+import org.apache.hyracks.algebricks.core.algebra.expressions.ScalarFunctionCallExpression;
+import org.apache.hyracks.algebricks.core.algebra.functions.AlgebricksBuiltinFunctions;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.AbstractBinaryJoinOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.EmptyTupleSourceOperator;
+import org.apache.hyracks.algebricks.core.config.AlgebricksConfig;
+import org.apache.hyracks.algebricks.core.rewriter.base.CardHints;
+import org.apache.hyracks.api.exceptions.ErrorCode;
+import org.apache.hyracks.api.exceptions.IWarningCollector;
+import org.apache.hyracks.api.exceptions.Warning;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+public class JoinNode {
+    private static final Logger LOGGER = LogManager.getLogger();
+
+    protected JoinEnum joinEnum;
+    protected int jnArrayIndex;
+    protected int datasetBits; // this is bitmap of all the keyspaceBits present in this joinNode
+    protected List<Integer> datasetIndexes;
+    protected List<String> datasetNames;
+    protected String alias;
+    protected int cheapestPlanIndex;
+    protected ICost cheapestPlanCost;
+    protected double origCardinality; // without any selections
+    protected double cardinality;
+    protected double size;
+    protected List<Integer> planIndexesArray; // indexes into the PlanNode array in enumerateJoins
+    protected int jnIndex, level, highestDatasetId;
+    protected JoinNode rightJn, leftJn;
+    protected List<Integer> applicableJoinConditions;
+    protected EmptyTupleSourceOperator correspondingEmptyTupleSourceOp; // There is a 1-1 relationship between the LVs and the dataSourceScanOps and the leafInputs.
+    protected List<Pair<IAccessMethod, Index>> chosenIndexes;
+    protected Map<IAccessMethod, AccessMethodAnalysisContext> analyzedAMs;
+    protected Index.SampleIndexDetails idxDetails;
+    protected static int NO_JN = -1;
+    protected static int NO_CARDS = -2;
+
+    public JoinNode(int i) {
+        this.jnArrayIndex = i;
+        planIndexesArray = new ArrayList<>();
+        cheapestPlanIndex = PlanNode.NO_PLAN;
+        size = 1; // for now, will be the size of the doc for this joinNode
+    }
+
+    public JoinNode(int i, JoinEnum joinE) {
+        this(i);
+        joinEnum = joinE;
+        cheapestPlanCost = joinEnum.getCostHandle().maxCost();
+    }
+
+    public boolean IsBaseLevelJoinNode() {
+        if (this.jnArrayIndex <= joinEnum.numberOfTerms) {
+            return true;
+        }
+        return false;
+    }
+
+    public boolean IsHigherLevelJoinNode() {
+        return !IsBaseLevelJoinNode();
+    }
+
+    protected double findCardinality() {
+        CardHints ch = joinEnum.cardHints;
+        if (ch == null) {
+            return Cost.MAX_CARD;
+        }
+        List<String> ls = CardHints.isolateVariables(this.datasetNames);
+        return ch.findCardinality(ls);
+    }
+
+    protected double findSize() {
+        CardHints ch = joinEnum.cardHints;
+        if (ch == null) {
+            return Cost.MAX_CARD;
+        }
+        List<String> ls = CardHints.isolateVariables(this.datasetNames);
+        return ch.findSize(ls);
+    }
+
+    public double computeJoinCardinality() {
+        JoinNode[] jnArray = joinEnum.getJnArray();
+        List<JoinCondition> joinConditions = joinEnum.getJoinConditions();
+
+        this.applicableJoinConditions = new ArrayList<>();
+        findApplicableJoinConditions();
+
+        if (LOGGER.isTraceEnabled() && this.applicableJoinConditions.size() == 0) {
+            LOGGER.trace("applicable Join Conditions size is 0 in join Node " + this.jnArrayIndex);
+        }
+
+        // Wonder if this computation will result in an overflow exception. Better to multiply them with selectivities also.
+        double productJoinCardinality = 1.0;
+        for (int idx : this.datasetIndexes) {
+            productJoinCardinality *= jnArray[idx].cardinality;
+        }
+
+        double productJoinSels = 1.0;
+        for (int idx : this.applicableJoinConditions) {
+            if (!joinConditions.get(idx).partOfComposite) {
+                productJoinSels *= joinConditions.get(idx).selectivity;
+            }
+        }
+        return productJoinCardinality * productJoinSels;
+    }
+
+    public double getCardinality() {
+        return cardinality;
+    }
+
+    public void setCardinality(double card) {
+        cardinality = card;
+    }
+
+    public double getOrigCardinality() {
+        return origCardinality;
+    }
+
+    public void setOrigCardinality(double card) {
+        origCardinality = card;
+    }
+
+    public void setAvgDocSize(double avgDocSize) {
+        size = avgDocSize;
+    }
+
+    public double getInputSize() {
+        return size;
+    }
+
+    public double getOutputSize() {
+        return size; // need to change this to account for projections
+    }
+
+    public JoinNode getLeftJn() {
+        return leftJn;
+    }
+
+    public JoinNode getRightJn() {
+        return rightJn;
+    }
+
+    public String getAlias() {
+        return alias;
+    }
+
+    public List<String> getDatasetNames() {
+        return datasetNames;
+    }
+
+    public Index.SampleIndexDetails getIdxDetails() {
+        return idxDetails;
+    }
+
+    protected boolean nestedLoopsApplicable(ILogicalExpression joinExpr) throws AlgebricksException {
+
+        List<LogicalVariable> usedVarList = new ArrayList<>();
+        joinExpr.getUsedVariables(usedVarList);
+        if (usedVarList.size() != 2) {
+            return false;
+        }
+
+        if (joinExpr.getExpressionTag() != LogicalExpressionTag.FUNCTION_CALL) {
+            return false;
+        }
+
+        LogicalVariable var0 = usedVarList.get(0);
+        LogicalVariable var1 = usedVarList.get(1);
+
+        // Find which joinLeafInput these vars belong to.
+        // go thru the leaf inputs and see where these variables came from
+        ILogicalOperator joinLeafInput0 = joinEnum.findLeafInput(Collections.singletonList(var0));
+        if (joinLeafInput0 == null) {
+            return false; // this should not happen unless an assignment is between two joins.
+        }
+
+        ILogicalOperator joinLeafInput1 = joinEnum.findLeafInput(Collections.singletonList(var1));
+        if (joinLeafInput1 == null) {
+            return false;
+        }
+
+        // We need to find out which one of these is the inner joinLeafInput. So for that get the joinLeafInput of this join node.
+        ILogicalOperator innerLeafInput = joinEnum.joinLeafInputsHashMap.get(this.correspondingEmptyTupleSourceOp);
+
+        // This must equal one of the two joinLeafInputsHashMap found above. check for sanity!!
+        if (innerLeafInput != joinLeafInput1 && innerLeafInput != joinLeafInput0) {
+            return false; // This should not happen. So debug to find out why this happened.
+        }
+
+        if (innerLeafInput == joinLeafInput0) {
+            joinEnum.localJoinOp.getInputs().get(0).setValue(joinLeafInput1);
+        } else {
+            joinEnum.localJoinOp.getInputs().get(0).setValue(joinLeafInput0);
+        }
+
+        joinEnum.localJoinOp.getInputs().get(1).setValue(innerLeafInput);
+
+        // We will always use the first join Op to provide the joinOp input for invoking rewritePre
+        AbstractBinaryJoinOperator joinOp = (AbstractBinaryJoinOperator) joinEnum.localJoinOp;
+        joinOp.getCondition().setValue(joinExpr);
+
+        // Now call the rewritePre code
+        IntroduceJoinAccessMethodRule tmp = new IntroduceJoinAccessMethodRule();
+        boolean temp = tmp.checkApplicable(new MutableObject<>(joinEnum.localJoinOp), joinEnum.optCtx);
+
+        return temp;
+    }
+
+    /** one is a subset of two */
+    private boolean subset(int one, int two) {
+        return (one & two) == one;
+    }
+
+    protected void findApplicableJoinConditions() {
+        List<JoinCondition> joinConditions = joinEnum.getJoinConditions();
+
+        int i = 0;
+        for (JoinCondition jc : joinConditions) {
+            if (subset(jc.datasetBits, this.datasetBits)) {
+                this.applicableJoinConditions.add(i);
+            }
+            i++;
+        }
+    }
+
+    protected List<Integer> getNewJoinConditionsOnly() {
+        List<Integer> newJoinConditions = new ArrayList<>();
+        JoinNode leftJn = this.leftJn;
+        JoinNode rightJn = this.rightJn;
+        // find the new table being added. This assume only zig zag trees for now.
+        int newTableBits = 0;
+        if (leftJn.jnArrayIndex <= joinEnum.numberOfTerms) {
+            newTableBits = leftJn.datasetBits;
+        } else if (rightJn.jnArrayIndex <= joinEnum.numberOfTerms) {
+            newTableBits = rightJn.datasetBits;
+        }
+
+        if (LOGGER.isTraceEnabled() && newTableBits == 0) {
+            LOGGER.trace("newTable Bits == 0");
+        }
+
+        // All the new join predicates will have these bits turned on
+        for (int idx : this.applicableJoinConditions) {
+            if ((joinEnum.joinConditions.get(idx).datasetBits & newTableBits) > 0) {
+                newJoinConditions.add(idx);
+            }
+        }
+
+        return newJoinConditions; // this can be of size 0 because this may be a cartesian join
+    }
+
+    public int addSingleDatasetPlans() {
+        List<PlanNode> allPlans = joinEnum.allPlans;
+        ICost opCost, totalCost;
+
+        opCost = joinEnum.getCostMethodsHandle().costFullScan(this);
+        totalCost = opCost;
+        if (this.cheapestPlanIndex == PlanNode.NO_PLAN || opCost.costLT(this.cheapestPlanCost)) {
+            // for now just add one plan
+            PlanNode pn = new PlanNode(allPlans.size(), joinEnum);
+            pn.jn = this;
+            pn.datasetName = this.datasetNames.get(0);
+            pn.correspondingEmptyTupleSourceOp = this.correspondingEmptyTupleSourceOp;
+            pn.jnIndexes[0] = this.jnArrayIndex;
+            pn.jnIndexes[1] = JoinNode.NO_JN;
+            pn.planIndexes[0] = PlanNode.NO_PLAN; // There ane no plans below this plan.
+            pn.planIndexes[1] = PlanNode.NO_PLAN; // There ane no plans below this plan.
+            pn.opCost = opCost;
+            pn.scanOp = PlanNode.ScanMethod.TABLE_SCAN;
+            pn.totalCost = totalCost;
+
+            allPlans.add(pn);
+            this.planIndexesArray.add(allPlans.size() - 1);
+            this.cheapestPlanCost = totalCost;
+            this.cheapestPlanIndex = allPlans.size() - 1;
+            return this.cheapestPlanIndex;
+        }
+        return PlanNode.NO_PLAN;
+    }
+
+    protected void buildIndexPlan() {
+        List<PlanNode> allPlans = joinEnum.allPlans;
+        ICost opCost, totalCost;
+
+        opCost = joinEnum.getCostMethodsHandle().costIndexScan(this);
+        totalCost = opCost;
+        if (this.cheapestPlanIndex == PlanNode.NO_PLAN || opCost.costLT(this.cheapestPlanCost)) {
+            // for now just add one plan
+            PlanNode pn = new PlanNode(allPlans.size(), joinEnum);
+            pn.jn = this;
+            pn.datasetName = this.datasetNames.get(0);
+            pn.correspondingEmptyTupleSourceOp = this.correspondingEmptyTupleSourceOp;
+            pn.jnIndexes[0] = this.jnArrayIndex;
+            pn.jnIndexes[1] = JoinNode.NO_JN;
+            pn.planIndexes[0] = PlanNode.NO_PLAN; // There ane no plans below this plan.
+            pn.planIndexes[1] = PlanNode.NO_PLAN; // There ane no plans below this plan.
+            pn.opCost = opCost;
+            pn.scanOp = PlanNode.ScanMethod.INDEX_SCAN;
+            pn.totalCost = totalCost;
+
+            allPlans.add(pn);
+            this.planIndexesArray.add(allPlans.size() - 1);
+            this.cheapestPlanCost = totalCost;
+            this.cheapestPlanIndex = allPlans.size() - 1;
+        }
+    }
+
+    protected void costAndChooseIndexPlans(ILogicalOperator leafInput,
+            Map<IAccessMethod, AccessMethodAnalysisContext> analyzedAMs) throws AlgebricksException {
+        // Skip indexes with selectivity greater than 0.1, add the SKIP_SECONDARY_INDEX annotation to its expression.
+        double sel;
+        Iterator<Map.Entry<IAccessMethod, AccessMethodAnalysisContext>> amIt = analyzedAMs.entrySet().iterator();
+        while (amIt.hasNext()) {
+            Map.Entry<IAccessMethod, AccessMethodAnalysisContext> amEntry = amIt.next();
+            AccessMethodAnalysisContext analysisCtx = amEntry.getValue();
+            Iterator<Map.Entry<Index, List<Pair<Integer, Integer>>>> indexIt =
+                    analysisCtx.getIteratorForIndexExprsAndVars();
+            List<IOptimizableFuncExpr> exprs = analysisCtx.getMatchedFuncExprs();
+            int exprIndex = 0;
+            while (indexIt.hasNext()) {
+                Map.Entry<Index, List<Pair<Integer, Integer>>> indexEntry = indexIt.next();
+                Index chosenIndex = indexEntry.getKey();
+                IOptimizableFuncExpr expr = exprs.get(exprIndex++);
+                AbstractFunctionCallExpression afce = expr.getFuncExpr();
+                PredicateCardinalityAnnotation selectivityAnnotation =
+                        afce.getAnnotation(PredicateCardinalityAnnotation.class);
+                if (selectivityAnnotation != null) {
+                    sel = selectivityAnnotation.getSelectivity();
+                    if (sel >= joinEnum.stats.SELECTIVITY_FOR_SECONDARY_INDEX_SELECTION) {
+                        afce.putAnnotation(SkipSecondaryIndexSearchExpressionAnnotation
+                                .newInstance(Collections.singleton(chosenIndex.getIndexName())));
+                    } else {
+                        buildIndexPlan();
+                    }
+                }
+            }
+        }
+    }
+
+    public void addIndexAccessPlans(ILogicalOperator leafInput) throws AlgebricksException {
+        IntroduceSelectAccessMethodRule tmp = new IntroduceSelectAccessMethodRule();
+        List<Pair<IAccessMethod, Index>> chosenIndexes = new ArrayList<>();
+        Map<IAccessMethod, AccessMethodAnalysisContext> analyzedAMs = new TreeMap<>();
+        boolean index_access_possible =
+                tmp.checkApplicable(new MutableObject<>(leafInput), joinEnum.optCtx, chosenIndexes, analyzedAMs);
+        this.chosenIndexes = chosenIndexes;
+        this.analyzedAMs = analyzedAMs;
+        if (index_access_possible) {
+            costAndChooseIndexPlans(leafInput, analyzedAMs);
+        }
+    }
+
+    protected int buildHashJoinPlan(JoinNode leftJn, JoinNode rightJn, ILogicalExpression hashJoinExpr) {
+        List<PlanNode> allPlans = joinEnum.allPlans;
+        PlanNode pn;
+        ICost hjCost, childCosts, totalCost;
+
+        this.leftJn = leftJn;
+        this.rightJn = rightJn;
+        int leftPlan = leftJn.cheapestPlanIndex;
+        int rightPlan = rightJn.cheapestPlanIndex;
+
+        if (hashJoinExpr == null || hashJoinExpr == ConstantExpression.TRUE) {
+            return PlanNode.NO_PLAN;
+        }
+
+        if (joinEnum.queryPlanShape.equals(AlgebricksConfig.QUERY_PLAN_SHAPE_LEFTDEEP)
+                && !leftJn.IsBaseLevelJoinNode()) {
+            return PlanNode.NO_PLAN;
+        }
+
+        if (joinEnum.queryPlanShape.equals(AlgebricksConfig.QUERY_PLAN_SHAPE_RIGHTDEEP)
+                && !rightJn.IsBaseLevelJoinNode()) {
+            return PlanNode.NO_PLAN;
+        }
+
+        if (rightJn.cardinality * rightJn.size <= leftJn.cardinality * leftJn.size || joinEnum.forceJoinOrderMode
+                || !joinEnum.queryPlanShape.equals(AlgebricksConfig.QUERY_PLAN_SHAPE_ZIGZAG)) {
+            // We want to build with the smaller side.
+            hjCost = joinEnum.getCostMethodsHandle().costHashJoin(this);
+            childCosts = allPlans.get(leftPlan).totalCost.costAdd(allPlans.get(rightPlan).totalCost);
+            totalCost = hjCost.costAdd(childCosts);
+            if (this.cheapestPlanIndex == PlanNode.NO_PLAN || totalCost.costLT(this.cheapestPlanCost)) {
+                pn = new PlanNode(allPlans.size(), joinEnum);
+                pn.jn = this;
+                pn.jnIndexes[0] = leftJn.jnArrayIndex;
+                pn.jnIndexes[1] = rightJn.jnArrayIndex;
+                pn.planIndexes[0] = leftPlan;
+                pn.planIndexes[1] = rightPlan;
+                pn.joinOp = PlanNode.JoinMethod.HYBRID_HASH_JOIN; // need to check that all the conditions have equality predicates ONLY.
+                pn.side = HashJoinExpressionAnnotation.BuildSide.RIGHT;
+                pn.joinExpr = hashJoinExpr;
+                pn.opCost = hjCost;
+                pn.totalCost = totalCost;
+                pn.leftExchangeCost = joinEnum.getCostMethodsHandle().computeHJProbeExchangeCost(this);
+                pn.rightExchangeCost = joinEnum.getCostMethodsHandle().computeHJBuildExchangeCost(this);
+
+                allPlans.add(pn);
+                this.planIndexesArray.add(allPlans.size() - 1);
+                this.cheapestPlanCost = totalCost;
+                this.cheapestPlanIndex = allPlans.size() - 1;
+                return this.cheapestPlanIndex;
+            }
+        }
+
+        return PlanNode.NO_PLAN;
+    }
+
+    protected int buildBroadcastHashJoinPlan(JoinNode leftJn, JoinNode rightJn, ILogicalExpression hashJoinExpr) {
+        List<PlanNode> allPlans = joinEnum.allPlans;
+        PlanNode pn;
+        ICost bcastHjCost, childCosts, totalCost;
+
+        this.leftJn = leftJn;
+        this.rightJn = rightJn;
+        int leftPlan = leftJn.cheapestPlanIndex;
+        int rightPlan = rightJn.cheapestPlanIndex;
+
+        if (hashJoinExpr == null || hashJoinExpr == ConstantExpression.TRUE) {
+            return PlanNode.NO_PLAN;
+        }
+
+        if (joinEnum.queryPlanShape.equals(AlgebricksConfig.QUERY_PLAN_SHAPE_LEFTDEEP)
+                && !leftJn.IsBaseLevelJoinNode()) {
+            return PlanNode.NO_PLAN;
+        }
+
+        if (joinEnum.queryPlanShape.equals(AlgebricksConfig.QUERY_PLAN_SHAPE_RIGHTDEEP)
+                && !rightJn.IsBaseLevelJoinNode()) {
+            return PlanNode.NO_PLAN;
+        }
+
+        if (rightJn.cardinality * rightJn.size <= leftJn.cardinality * leftJn.size || joinEnum.forceJoinOrderMode
+                || !joinEnum.queryPlanShape.equals(AlgebricksConfig.QUERY_PLAN_SHAPE_ZIGZAG)) {
+            // We want to broadcast and build with the smaller side.
+            bcastHjCost = joinEnum.getCostMethodsHandle().costBroadcastHashJoin(this);
+            childCosts = allPlans.get(leftPlan).totalCost.costAdd(allPlans.get(rightPlan).totalCost);
+            totalCost = bcastHjCost.costAdd(childCosts);
+            if (this.cheapestPlanIndex == PlanNode.NO_PLAN || totalCost.costLT(this.cheapestPlanCost)) {
+                pn = new PlanNode(allPlans.size(), joinEnum);
+                pn.jn = this;
+                pn.jnIndexes[0] = leftJn.jnArrayIndex;
+                pn.jnIndexes[1] = rightJn.jnArrayIndex;
+                pn.planIndexes[0] = leftPlan;
+                pn.planIndexes[1] = rightPlan;
+                pn.joinOp = PlanNode.JoinMethod.BROADCAST_HASH_JOIN; // need to check that all the conditions have equality predicates ONLY.
+                pn.side = HashJoinExpressionAnnotation.BuildSide.RIGHT;
+                pn.joinExpr = hashJoinExpr;
+                pn.opCost = bcastHjCost;
+                pn.totalCost = totalCost;
+                pn.leftExchangeCost = joinEnum.getCostHandle().zeroCost();
+                pn.rightExchangeCost = joinEnum.getCostMethodsHandle().computeBHJBuildExchangeCost(this);
+
+                allPlans.add(pn);
+                this.planIndexesArray.add(allPlans.size() - 1);
+                this.cheapestPlanCost = totalCost;
+                this.cheapestPlanIndex = allPlans.size() - 1;
+                return this.cheapestPlanIndex;
+            }
+        }
+
+        return PlanNode.NO_PLAN;
+    }
+
+    protected int buildNLJoinPlan(JoinNode leftJn, JoinNode rightJn, ILogicalExpression nestedLoopJoinExpr)
+            throws AlgebricksException {
+        // Build a nested loops plan, first check if it is possible
+        // left right order must be preserved and right side should be a single data set
+        List<PlanNode> allPlans = joinEnum.allPlans;
+        int numberOfTerms = joinEnum.numberOfTerms;
+        PlanNode pn;
+        ICost nljCost, childCosts, totalCost;
+
+        this.leftJn = leftJn;
+        this.rightJn = rightJn;
+        int leftPlan = leftJn.cheapestPlanIndex;
+        int rightPlan = rightJn.cheapestPlanIndex;
+        if (rightJn.jnArrayIndex > numberOfTerms) {
+            // right side consists of more than one table
+            return PlanNode.NO_PLAN; // nested loop plan not possible.
+        }
+
+        if (nestedLoopJoinExpr == null || !rightJn.nestedLoopsApplicable(nestedLoopJoinExpr)) {
+            return PlanNode.NO_PLAN;
+        }
+
+        nljCost = joinEnum.getCostMethodsHandle().costIndexNLJoin(this);
+        childCosts = allPlans.get(leftPlan).totalCost;
+        totalCost = nljCost.costAdd(childCosts);
+        if (this.cheapestPlanIndex == PlanNode.NO_PLAN || totalCost.costLT(this.cheapestPlanCost)) {
+            pn = new PlanNode(allPlans.size(), joinEnum);
+            pn.jn = this;
+            pn.jnIndexes[0] = leftJn.jnArrayIndex;
+            pn.jnIndexes[1] = rightJn.jnArrayIndex;
+            pn.planIndexes[0] = leftPlan;
+            pn.planIndexes[1] = rightPlan;
+            pn.joinOp = PlanNode.JoinMethod.INDEX_NESTED_LOOP_JOIN;
+            pn.joinExpr = nestedLoopJoinExpr; // save it so can be used to add the NESTED annotation in getNewTree.
+            pn.opCost = nljCost;
+            pn.totalCost = totalCost;
+            pn.leftExchangeCost = joinEnum.getCostMethodsHandle().computeNLJOuterExchangeCost(this);
+            pn.rightExchangeCost = joinEnum.getCostHandle().zeroCost();
+
+            allPlans.add(pn);
+            this.planIndexesArray.add(allPlans.size() - 1);
+            this.cheapestPlanCost = totalCost;
+            this.cheapestPlanIndex = allPlans.size() - 1;
+            return allPlans.size() - 1;
+        }
+        return PlanNode.NO_PLAN;
+    }
+
+    protected int buildCPJoinPlan(JoinNode leftJn, JoinNode rightJn, ILogicalExpression hashJoinExpr,
+            ILogicalExpression nestedLoopJoinExpr) {
+        // Now build a cartesian product nested loops plan
+        List<PlanNode> allPlans = joinEnum.allPlans;
+        PlanNode pn;
+        ICost cpCost, childCosts, totalCost;
+
+        this.leftJn = leftJn;
+        this.rightJn = rightJn;
+        int leftPlan = leftJn.cheapestPlanIndex;
+        int rightPlan = rightJn.cheapestPlanIndex;
+
+        ILogicalExpression cpJoinExpr = null;
+        List<Integer> newJoinConditions = this.getNewJoinConditionsOnly();
+        if (hashJoinExpr == null && nestedLoopJoinExpr == null) {
+            cpJoinExpr = joinEnum.combineAllConditions(newJoinConditions);
+        } else if (hashJoinExpr != null && nestedLoopJoinExpr == null) {
+            cpJoinExpr = hashJoinExpr;
+        } else if (hashJoinExpr == null && nestedLoopJoinExpr != null) {
+            cpJoinExpr = nestedLoopJoinExpr;
+        } else if (Objects.equals(hashJoinExpr, nestedLoopJoinExpr) == true) {
+            cpJoinExpr = hashJoinExpr;
+        } else if (Objects.equals(hashJoinExpr, nestedLoopJoinExpr) == false) {
+            ScalarFunctionCallExpression andExpr = new ScalarFunctionCallExpression(
+                    BuiltinFunctions.getBuiltinFunctionInfo(AlgebricksBuiltinFunctions.AND));
+            andExpr.getArguments().add(new MutableObject<>(hashJoinExpr));
+            andExpr.getArguments().add(new MutableObject<>(nestedLoopJoinExpr));
+            cpJoinExpr = andExpr;
+        }
+
+        cpCost = joinEnum.getCostMethodsHandle().costCartesianProductJoin(this);
+        childCosts = allPlans.get(leftPlan).totalCost.costAdd(allPlans.get(rightPlan).totalCost);
+        totalCost = cpCost.costAdd(childCosts);
+        if (this.cheapestPlanIndex == PlanNode.NO_PLAN || totalCost.costLT(this.cheapestPlanCost)) {
+            pn = new PlanNode(allPlans.size(), joinEnum);
+            pn.jn = this;
+            pn.jnIndexes[0] = leftJn.jnArrayIndex;
+            pn.jnIndexes[1] = rightJn.jnArrayIndex;
+            pn.planIndexes[0] = leftPlan;
+            pn.planIndexes[1] = rightPlan;
+            pn.joinOp = PlanNode.JoinMethod.CARTESIAN_PRODUCT_JOIN;
+            pn.joinExpr = Objects.requireNonNullElse(cpJoinExpr, ConstantExpression.TRUE);
+            pn.opCost = cpCost;
+            pn.totalCost = totalCost;
+            pn.leftExchangeCost = joinEnum.getCostHandle().zeroCost();
+            pn.rightExchangeCost = joinEnum.getCostMethodsHandle().computeCPRightExchangeCost(this);
+
+            allPlans.add(pn);
+            this.planIndexesArray.add(allPlans.size() - 1);
+            this.cheapestPlanCost = totalCost;
+            this.cheapestPlanIndex = allPlans.size() - 1;
+            return allPlans.size() - 1;
+        }
+        return PlanNode.NO_PLAN;
+    }
+
+    protected Pair<Integer, ICost> addMultiDatasetPlans(JoinNode leftJn, JoinNode rightJn, int level)
+            throws AlgebricksException {
+        this.leftJn = leftJn;
+        this.rightJn = rightJn;
+        ICost noJoinCost = joinEnum.getCostHandle().maxCost();
+
+        if (leftJn.planIndexesArray.size() == 0 || rightJn.planIndexesArray.size() == 0) {
+            return new Pair<>(PlanNode.NO_PLAN, noJoinCost);
+        }
+
+        if (this.cardinality >= Cost.MAX_CARD) {
+            return new Pair<>(PlanNode.NO_PLAN, noJoinCost); // no card hint available, so do not add this plan
+        }
+
+        List<Integer> newJoinConditions = this.getNewJoinConditionsOnly(); // these will be a subset of applicable join conditions.
+        ILogicalExpression hashJoinExpr = joinEnum.getHashJoinExpr(newJoinConditions);
+        ILogicalExpression nestedLoopJoinExpr = joinEnum.getNestedLoopJoinExpr(newJoinConditions);
+
+        if ((newJoinConditions.size() == 0) && joinEnum.connectedJoinGraph) {
+            // at least one plan must be there at each level as the graph is fully connected.
+            if (leftJn.cardinality * rightJn.cardinality > 10000.0) {
+                return new Pair<>(PlanNode.NO_PLAN, noJoinCost);
+            }
+        }
+
+        double current_card = this.cardinality;
+        if (current_card >= Cost.MAX_CARD) {
+            return new Pair<>(PlanNode.NO_PLAN, noJoinCost); // no card hint available, so do not add this plan
+        }
+
+        int hjPlan, commutativeHjPlan, bcastHjPlan, commutativeBcastHjPlan, nljPlan, commutativeNljPlan, cpPlan,
+                commutativeCpPlan;
+        hjPlan = commutativeHjPlan = bcastHjPlan =
+                commutativeBcastHjPlan = nljPlan = commutativeNljPlan = cpPlan = commutativeCpPlan = PlanNode.NO_PLAN;
+
+        HashJoinExpressionAnnotation.BuildSide hintHashJoin = joinEnum.findHashJoinHint(newJoinConditions);
+        BroadcastExpressionAnnotation.BroadcastSide hintBroadcastHashJoin = null;
+        boolean hintNLJoin = false;
+        if (hintHashJoin == null) {
+            hintBroadcastHashJoin = joinEnum.findBroadcastHashJoinHint(newJoinConditions);
+            if (hintBroadcastHashJoin == null) {
+                hintNLJoin = joinEnum.findNLJoinHint(newJoinConditions);
+            }
+        }
+
+        if (leftJn.cheapestPlanIndex == PlanNode.NO_PLAN || rightJn.cheapestPlanIndex == PlanNode.NO_PLAN) {
+            return new Pair<>(PlanNode.NO_PLAN, noJoinCost);
+        }
+
+        if (hintHashJoin != null) {
+            hjPlan = buildHashJoinPlan(leftJn, rightJn, hashJoinExpr);
+            if (!joinEnum.forceJoinOrderMode && hintHashJoin != HashJoinExpressionAnnotation.BuildSide.RIGHT) {
+                commutativeHjPlan = buildHashJoinPlan(rightJn, leftJn, hashJoinExpr);
+            }
+            if (hjPlan == PlanNode.NO_PLAN && commutativeHjPlan == PlanNode.NO_PLAN) {
+                // Hints are attached to predicates, so newJoinConditions should not be empty, but adding the check to be safe.
+                if (!joinEnum.getJoinConditions().isEmpty() && !newJoinConditions.isEmpty()) {
+                    IWarningCollector warningCollector = joinEnum.optCtx.getWarningCollector();
+                    if (warningCollector.shouldWarn()) {
+                        warningCollector.warn(Warning.of(
+                                joinEnum.getJoinConditions().get(newJoinConditions.get(0)).joinCondition
+                                        .getSourceLocation(),
+                                ErrorCode.INAPPLICABLE_HINT, "Hash join hint not applicable and was ignored"));
+                    }
+                }
+                bcastHjPlan = buildBroadcastHashJoinPlan(leftJn, rightJn, hashJoinExpr);
+                if (!joinEnum.forceJoinOrderMode) {
+                    commutativeBcastHjPlan = buildBroadcastHashJoinPlan(rightJn, leftJn, hashJoinExpr);
+                }
+                nljPlan = buildNLJoinPlan(leftJn, rightJn, nestedLoopJoinExpr);
+                if (!joinEnum.forceJoinOrderMode) {
+                    commutativeNljPlan = buildNLJoinPlan(rightJn, leftJn, nestedLoopJoinExpr);
+                }
+                cpPlan = buildCPJoinPlan(leftJn, rightJn, hashJoinExpr, nestedLoopJoinExpr);
+                if (!joinEnum.forceJoinOrderMode) {
+                    commutativeCpPlan = buildCPJoinPlan(rightJn, leftJn, hashJoinExpr, nestedLoopJoinExpr);
+                }
+            }
+        } else if (hintBroadcastHashJoin != null) {
+            bcastHjPlan = buildBroadcastHashJoinPlan(leftJn, rightJn, hashJoinExpr);
+            if (!joinEnum.forceJoinOrderMode
+                    && hintBroadcastHashJoin != BroadcastExpressionAnnotation.BroadcastSide.RIGHT) {
+                commutativeBcastHjPlan = buildBroadcastHashJoinPlan(rightJn, leftJn, hashJoinExpr);
+            }
+            if (bcastHjPlan == PlanNode.NO_PLAN && commutativeBcastHjPlan == PlanNode.NO_PLAN) {
+                // Hints are attached to predicates, so newJoinConditions should not be empty, but adding the check to be safe.
+                if (!joinEnum.getJoinConditions().isEmpty() && !newJoinConditions.isEmpty()) {
+                    IWarningCollector warningCollector = joinEnum.optCtx.getWarningCollector();
+                    if (warningCollector.shouldWarn()) {
+                        warningCollector.warn(Warning.of(
+                                joinEnum.getJoinConditions().get(newJoinConditions.get(0)).joinCondition
+                                        .getSourceLocation(),
+                                ErrorCode.INAPPLICABLE_HINT,
+                                "Broadcast hash join hint not applicable and was ignored"));
+                    }
+                }
+
+                hjPlan = buildHashJoinPlan(leftJn, rightJn, hashJoinExpr);
+                if (!joinEnum.forceJoinOrderMode) {
+                    commutativeHjPlan = buildHashJoinPlan(rightJn, leftJn, hashJoinExpr);
+                }
+                nljPlan = buildNLJoinPlan(leftJn, rightJn, nestedLoopJoinExpr);
+                if (!joinEnum.forceJoinOrderMode) {
+                    commutativeNljPlan = buildNLJoinPlan(rightJn, leftJn, nestedLoopJoinExpr);
+                }
+                cpPlan = buildCPJoinPlan(leftJn, rightJn, hashJoinExpr, nestedLoopJoinExpr);
+                if (!joinEnum.forceJoinOrderMode) {
+                    commutativeCpPlan = buildCPJoinPlan(rightJn, leftJn, hashJoinExpr, nestedLoopJoinExpr);
+                }
+            }
+        } else if (hintNLJoin) {
+            nljPlan = buildNLJoinPlan(leftJn, rightJn, nestedLoopJoinExpr);
+            if (!joinEnum.forceJoinOrderMode) {
+                commutativeNljPlan = buildNLJoinPlan(rightJn, leftJn, nestedLoopJoinExpr);
+            }
+            if (nljPlan == PlanNode.NO_PLAN && commutativeNljPlan == PlanNode.NO_PLAN) {
+                // Hints are attached to predicates, so newJoinConditions should not be empty, but adding the check to be safe.
+                if (!joinEnum.getJoinConditions().isEmpty() && !newJoinConditions.isEmpty()) {
+                    IWarningCollector warningCollector = joinEnum.optCtx.getWarningCollector();
+                    if (warningCollector.shouldWarn()) {
+                        warningCollector.warn(Warning.of(
+                                joinEnum.getJoinConditions().get(newJoinConditions.get(0)).joinCondition
+                                        .getSourceLocation(),
+                                ErrorCode.INAPPLICABLE_HINT, "Index nested join hint not applicable and was ignored"));
+                    }
+                }
+                hjPlan = buildHashJoinPlan(leftJn, rightJn, hashJoinExpr);
+                if (!joinEnum.forceJoinOrderMode) {
+                    commutativeHjPlan = buildHashJoinPlan(rightJn, leftJn, hashJoinExpr);
+                }
+                bcastHjPlan = buildBroadcastHashJoinPlan(leftJn, rightJn, hashJoinExpr);
+                if (!joinEnum.forceJoinOrderMode) {
+                    commutativeBcastHjPlan = buildBroadcastHashJoinPlan(rightJn, leftJn, hashJoinExpr);
+                }
+                cpPlan = buildCPJoinPlan(leftJn, rightJn, hashJoinExpr, nestedLoopJoinExpr);
+                if (!joinEnum.forceJoinOrderMode) {
+                    commutativeCpPlan = buildCPJoinPlan(rightJn, leftJn, hashJoinExpr, nestedLoopJoinExpr);
+                }
+            }
+        } else {
+            hjPlan = buildHashJoinPlan(leftJn, rightJn, hashJoinExpr);
+            if (!joinEnum.forceJoinOrderMode) {
+                commutativeHjPlan = buildHashJoinPlan(rightJn, leftJn, hashJoinExpr);
+            }
+            bcastHjPlan = buildBroadcastHashJoinPlan(leftJn, rightJn, hashJoinExpr);
+            if (!joinEnum.forceJoinOrderMode) {
+                commutativeBcastHjPlan = buildBroadcastHashJoinPlan(rightJn, leftJn, hashJoinExpr);
+            }
+            nljPlan = buildNLJoinPlan(leftJn, rightJn, nestedLoopJoinExpr);
+            if (!joinEnum.forceJoinOrderMode) {
+                commutativeNljPlan = buildNLJoinPlan(rightJn, leftJn, nestedLoopJoinExpr);
+            }
+            cpPlan = buildCPJoinPlan(leftJn, rightJn, hashJoinExpr, nestedLoopJoinExpr);
+            if (!joinEnum.forceJoinOrderMode) {
+                commutativeCpPlan = buildCPJoinPlan(rightJn, leftJn, hashJoinExpr, nestedLoopJoinExpr);
+            }
+        }
+
+        if (hjPlan == PlanNode.NO_PLAN && commutativeHjPlan == PlanNode.NO_PLAN && bcastHjPlan == PlanNode.NO_PLAN
+                && commutativeBcastHjPlan == PlanNode.NO_PLAN && nljPlan == PlanNode.NO_PLAN
+                && commutativeNljPlan == PlanNode.NO_PLAN && cpPlan == PlanNode.NO_PLAN
+                && commutativeCpPlan == PlanNode.NO_PLAN) {
+            return new Pair<>(PlanNode.NO_PLAN, noJoinCost);
+        }
+
+        //Reset as these might have changed when we tried the commutative joins.
+        this.leftJn = leftJn;
+        this.rightJn = rightJn;
+
+        return new Pair<>(this.cheapestPlanIndex, this.cheapestPlanCost);
+    }
+
+    protected int findCheapestPlan() {
+        List<PlanNode> allPlans = joinEnum.allPlans;
+        ICost cheapestCost = joinEnum.getCostHandle().maxCost();
+        int cheapestIndex = PlanNode.NO_PLAN;
+
+        for (int planIndex : this.planIndexesArray) {
+            if (allPlans.get(planIndex).totalCost.costLT(cheapestCost)) {
+                cheapestCost = allPlans.get(planIndex).totalCost;
+                cheapestIndex = planIndex;
+            }
+        }
+        return cheapestIndex;
+    }
+
+    @Override
+    public String toString() {
+        if (planIndexesArray.isEmpty()) {
+            return "";
+        }
+        List<PlanNode> allPlans = joinEnum.allPlans;
+        StringBuilder sb = new StringBuilder(128);
+        // This will avoid printing JoinNodes that have no plans
+        sb.append("Printing Join Node ").append(jnArrayIndex).append('\n');
+        sb.append("datasetNames ").append('\n');
+        for (int j = 0; j < datasetNames.size(); j++) {
+            // Need to not print newline
+            sb.append(datasetNames.get(j)).append(' ');
+        }
+        sb.append("datasetIndex ").append('\n');
+        for (int j = 0; j < datasetIndexes.size(); j++) {
+            sb.append(j).append(datasetIndexes.get(j)).append('\n');
+        }
+        sb.append("datasetBits is ").append(datasetBits).append('\n');
+        if (IsBaseLevelJoinNode()) {
+            sb.append("orig cardinality is ").append((double) Math.round(origCardinality * 100) / 100).append('\n');
+        }
+        sb.append("cardinality is ").append((double) Math.round(cardinality * 100) / 100).append('\n');
+        if (planIndexesArray.size() == 0) {
+            sb.append("No plans considered for this join node").append('\n');
+        }
+        for (int j = 0; j < planIndexesArray.size(); j++) {
+            int k = planIndexesArray.get(j);
+            PlanNode pn = allPlans.get(k);
+            sb.append("planIndexesArray  [").append(j).append("] is ").append(k).append('\n');
+            sb.append("Printing PlanNode ").append(k);
+            if (IsBaseLevelJoinNode()) {
+                sb.append("DATA_SOURCE_SCAN").append('\n');
+            } else {
+                sb.append("\n");
+                sb.append(pn.joinMethod().getFirst()).append('\n');
+                sb.append("Printing Join expr ").append('\n');
+                if (pn.joinExpr != null) {
+                    sb.append(pn.joinExpr).append('\n');
+                } else {
+                    sb.append("null").append('\n');
+                }
+            }
+            sb.append("card ").append((double) Math.round(cardinality * 100) / 100).append('\n');
+            sb.append("operator cost ").append(pn.opCost.computeTotalCost()).append('\n');
+            sb.append("total cost ").append(pn.totalCost.computeTotalCost()).append('\n');
+            sb.append("jnIndexes ").append(pn.jnIndexes[0]).append(" ").append(pn.jnIndexes[1]).append('\n');
+            if (IsHigherLevelJoinNode()) {
+                PlanNode leftPlan = pn.getLeftPlanNode();
+                PlanNode rightPlan = pn.getRightPlanNode();
+                int l = leftPlan.allPlansIndex;
+                int r = rightPlan.allPlansIndex;
+                sb.append("planIndexes ").append(l).append(" ").append(r).append('\n');
+                sb.append("(lcost = ").append(leftPlan.totalCost.computeTotalCost()).append(") (rcost = ")
+                        .append(rightPlan.totalCost.computeTotalCost()).append(")").append('\n');
+            }
+            sb.append("\n");
+        }
+        sb.append("jnIndex ").append(jnIndex).append('\n');
+        sb.append("datasetBits ").append(datasetBits).append('\n');
+        sb.append("cardinality ").append((double) Math.round(cardinality * 100) / 100).append('\n');
+        sb.append("size ").append((double) Math.round(size * 100) / 100).append('\n');
+        sb.append("level ").append(level).append('\n');
+        sb.append("highestDatasetId ").append(highestDatasetId).append('\n');
+        sb.append("--------------------------------------").append('\n');
+        return sb.toString();
+    }
+
+    public void printCostOfAllPlans() {
+        List<PlanNode> allPlans = joinEnum.allPlans;
+        for (int planIndex : planIndexesArray) {
+            LOGGER.trace("plan " + planIndex + " cost is " + allPlans.get(planIndex).totalCost.computeTotalCost());
+        }
+    }
+}
diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/cbo/PlanNode.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/cbo/PlanNode.java
new file mode 100644
index 0000000..1dca15f
--- /dev/null
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/cbo/PlanNode.java
@@ -0,0 +1,176 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.asterix.optimizer.rules.cbo;
+
+import org.apache.asterix.optimizer.cost.ICost;
+import org.apache.hyracks.algebricks.common.utils.Pair;
+import org.apache.hyracks.algebricks.core.algebra.base.ILogicalExpression;
+import org.apache.hyracks.algebricks.core.algebra.expressions.HashJoinExpressionAnnotation;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.DataSourceScanOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.EmptyTupleSourceOperator;
+
+public class PlanNode {
+
+    public static int NO_PLAN = -1;
+
+    private final JoinEnum joinEnum;
+    int allPlansIndex;
+    int[] planIndexes;
+    int[] jnIndexes;
+    JoinNode jn;
+    String datasetName;
+    ICost opCost;
+    ICost totalCost;
+    ICost leftExchangeCost;
+    ICost rightExchangeCost;
+    JoinMethod joinOp;
+    // Used to indicate which side to build for HJ and which side to broadcast for BHJ.
+    HashJoinExpressionAnnotation.BuildSide side;
+    ScanMethod scanOp;
+    ILogicalExpression joinExpr;
+    DataSourceScanOperator correspondingDataSourceScanOp;
+    EmptyTupleSourceOperator correspondingEmptyTupleSourceOp;
+
+    public enum ScanMethod {
+        INDEX_SCAN,
+        TABLE_SCAN
+    }
+
+    public enum JoinMethod {
+        HYBRID_HASH_JOIN,
+        BROADCAST_HASH_JOIN,
+        INDEX_NESTED_LOOP_JOIN,
+        CARTESIAN_PRODUCT_JOIN
+    }
+
+    public PlanNode(int planIndex, JoinEnum joinE) {
+        this.allPlansIndex = planIndex;
+        joinEnum = joinE;
+        planIndexes = new int[2]; // 0 is for left, 1 is for right
+        jnIndexes = new int[2]; // join node index(es)
+    }
+
+    public int[] getPlanIndexes() {
+        return planIndexes;
+    }
+
+    public int getLeftPlanIndex() {
+        return planIndexes[0];
+    }
+
+    public PlanNode getLeftPlanNode() {
+        if (planIndexes[0] == NO_PLAN) {
+            return null;
+        }
+        return joinEnum.allPlans.get(planIndexes[0]);
+    }
+
+    public PlanNode getRightPlanNode() {
+        if (planIndexes[1] == NO_PLAN) {
+            return null;
+        }
+        return joinEnum.allPlans.get(planIndexes[1]);
+    }
+
+    public JoinNode getJoinNode() {
+        return jn;
+    }
+
+    public int getRightPlanIndex() {
+        return planIndexes[1];
+    }
+
+    public int getLeftJoinIndex() {
+        return jnIndexes[0];
+    }
+
+    public int getRightJoinIndex() {
+        return jnIndexes[1];
+    }
+
+    public boolean IsScanNode() {
+        return getLeftPlanIndex() == NO_PLAN && getRightPlanIndex() == NO_PLAN;
+    }
+
+    public boolean IsJoinNode() {
+        return getLeftPlanIndex() != NO_PLAN && getRightPlanIndex() != NO_PLAN;
+    }
+
+    Pair<String, String> joinMethod() {
+        if (this.joinOp == PlanNode.JoinMethod.HYBRID_HASH_JOIN) {
+            return new Pair<>("HASH JOIN", "HJ");
+        } else if (this.joinOp == PlanNode.JoinMethod.BROADCAST_HASH_JOIN) {
+            return new Pair<>("BROADCAST HASH JOIN", "BHJ");
+        } else if (this.joinOp == PlanNode.JoinMethod.INDEX_NESTED_LOOP_JOIN) {
+            return new Pair<>("INDEX NESTED LOOPS JOIN", "INLJ");
+        } else if (this.joinOp == PlanNode.JoinMethod.CARTESIAN_PRODUCT_JOIN) {
+            return new Pair<>("CARTESIAN PRODUCT JOIN", "CPJ");
+        }
+        return new Pair<>("", "");
+    }
+
+    public String getDatasetName() {
+        return datasetName;
+    }
+
+    public DataSourceScanOperator getDataSourceScanOp() {
+        return correspondingDataSourceScanOp; // This applies only to singleDataSetPlans
+    }
+
+    public EmptyTupleSourceOperator getEmptyTupleSourceOp() {
+        return correspondingEmptyTupleSourceOp; // This applies only to singleDataSetPlans
+    }
+
+    public ICost getOpCost() {
+        return opCost;
+    }
+
+    public double computeOpCost() {
+        return opCost.computeTotalCost();
+    }
+
+    public ICost getTotalCost() {
+        return totalCost;
+    }
+
+    public double getLeftExchangeCost() {
+        return leftExchangeCost.computeTotalCost();
+    }
+
+    public double getRightExchangeCost() {
+        return rightExchangeCost.computeTotalCost();
+    }
+
+    public double computeTotalCost() {
+        return totalCost.computeTotalCost();
+    }
+
+    public ScanMethod getScanOp() {
+        return scanOp;
+    }
+
+    public JoinMethod getJoinOp() {
+        return joinOp;
+    }
+
+    public ILogicalExpression getJoinExpr() {
+        return joinExpr;
+    }
+}
diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/cbo/Stats.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/cbo/Stats.java
new file mode 100644
index 0000000..96bc412
--- /dev/null
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/cbo/Stats.java
@@ -0,0 +1,218 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.asterix.optimizer.rules.cbo;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.asterix.common.metadata.DataverseName;
+import org.apache.asterix.metadata.declared.DataSource;
+import org.apache.asterix.metadata.declared.DataSourceId;
+import org.apache.asterix.metadata.declared.MetadataProvider;
+import org.apache.asterix.metadata.entities.Index;
+import org.apache.hyracks.algebricks.common.exceptions.AlgebricksException;
+import org.apache.hyracks.algebricks.core.algebra.base.ILogicalExpression;
+import org.apache.hyracks.algebricks.core.algebra.base.ILogicalOperator;
+import org.apache.hyracks.algebricks.core.algebra.base.IOptimizationContext;
+import org.apache.hyracks.algebricks.core.algebra.base.LogicalExpressionTag;
+import org.apache.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
+import org.apache.hyracks.algebricks.core.algebra.base.LogicalVariable;
+import org.apache.hyracks.algebricks.core.algebra.expressions.AbstractFunctionCallExpression;
+import org.apache.hyracks.algebricks.core.algebra.expressions.JoinProductivityAnnotation;
+import org.apache.hyracks.algebricks.core.algebra.expressions.PredicateCardinalityAnnotation;
+import org.apache.hyracks.algebricks.core.algebra.functions.AlgebricksBuiltinFunctions;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.DataSourceScanOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.SelectOperator;
+import org.apache.hyracks.algebricks.core.algebra.operators.logical.SubplanOperator;
+
+public class Stats {
+
+    public double SELECTIVITY_FOR_SECONDARY_INDEX_SELECTION = 0.1;
+
+    protected IOptimizationContext optCtx;
+    protected JoinEnum joinEnum;
+
+    public Stats(IOptimizationContext context, JoinEnum joinE) {
+        optCtx = context;
+        joinEnum = joinE;
+    }
+
+    public DataverseName findDataverseName(DataSourceScanOperator scanOp) {
+        if (scanOp == null) {
+            // this should rarely happen (IN lists may cause this)
+            return null;
+        }
+        DataSourceId dsid = (DataSourceId) scanOp.getDataSource().getId();
+        return dsid.getDataverseName();
+    }
+
+    public Index findSampleIndex(DataSourceScanOperator scanOp, IOptimizationContext context)
+            throws AlgebricksException {
+        DataverseName dataverseName = findDataverseName(scanOp);
+        DataSource ds = (DataSource) scanOp.getDataSource();
+        DataSourceId dsid = ds.getId();
+        MetadataProvider mdp = (MetadataProvider) context.getMetadataProvider();
+        return mdp.findSampleIndex(dataverseName, dsid.getDatasourceName());
+    }
+
+    private double findJoinSelectivity(JoinProductivityAnnotation anno, AbstractFunctionCallExpression joinExpr)
+            throws AlgebricksException {
+        List<LogicalVariable> exprUsedVars = new ArrayList<>();
+        joinExpr.getUsedVariables(exprUsedVars);
+        if (exprUsedVars.size() != 2) {
+            // Since there is a left and right dataset here, expecting only two variables.
+            return 1.0;
+        }
+        int idx1 = joinEnum.findJoinNodeIndex(exprUsedVars.get(0)) + 1;
+        int idx2 = joinEnum.findJoinNodeIndex(exprUsedVars.get(1)) + 1;
+        double card1 = joinEnum.getJnArray()[idx1].origCardinality;
+        double card2 = joinEnum.getJnArray()[idx2].origCardinality;
+        if (card1 == 0.0 || card2 == 0.0) // should not happen
+        {
+            return 1.0;
+        }
+
+        // join sel  = leftside * productivity/(card1 * card2);
+        if (anno != null) {
+            int leftIndex = joinEnum.findJoinNodeIndexByName(anno.getLeftSideDataSet());
+            if (leftIndex != idx1 && leftIndex != idx2) {
+                // should not happen
+                return 1.0;
+            }
+            if (leftIndex == idx1) {
+                return anno.getJoinProductivity() / card2;
+            } else {
+                return anno.getJoinProductivity() / card1;
+            }
+        } else {
+            if (card1 < card2) {
+                // we are assuming that the smaller side is the primary side and that the join is Pk-Fk join.
+                return 1.0 / card1;
+            }
+            return 1.0 / card2;
+        }
+    }
+
+    // The expression we get may not be a base condition. It could be comprised of ors and ands and nots. So have to
+    //recursively find the overall selectivity.
+    protected double getSelectivityFromAnnotation(AbstractFunctionCallExpression afcExpr, boolean join)
+            throws AlgebricksException {
+        double sel = 1.0;
+
+        if (afcExpr.getFunctionIdentifier().equals(AlgebricksBuiltinFunctions.OR)) {
+            double orSel = getSelectivityFromAnnotation(
+                    (AbstractFunctionCallExpression) afcExpr.getArguments().get(0).getValue(), join);
+            for (int i = 1; i < afcExpr.getArguments().size(); i++) {
+                ILogicalExpression lexpr = afcExpr.getArguments().get(i).getValue();
+                if (lexpr.getExpressionTag().equals(LogicalExpressionTag.FUNCTION_CALL)) {
+                    sel = getSelectivityFromAnnotation(
+                            (AbstractFunctionCallExpression) afcExpr.getArguments().get(i).getValue(), join);
+                    orSel = orSel + sel - orSel * sel;
+                }
+            }
+            return orSel;
+        } else if (afcExpr.getFunctionIdentifier().equals(AlgebricksBuiltinFunctions.AND)) {
+            double andSel = 1.0;
+            for (int i = 0; i < afcExpr.getArguments().size(); i++) {
+                ILogicalExpression lexpr = afcExpr.getArguments().get(i).getValue();
+                if (lexpr.getExpressionTag().equals(LogicalExpressionTag.FUNCTION_CALL)) {
+                    sel = getSelectivityFromAnnotation(
+                            (AbstractFunctionCallExpression) afcExpr.getArguments().get(i).getValue(), join);
+                    andSel *= sel;
+                }
+            }
+            return andSel;
+        } else if (afcExpr.getFunctionIdentifier().equals(AlgebricksBuiltinFunctions.NOT)) {
+            ILogicalExpression lexpr = afcExpr.getArguments().get(0).getValue();
+            if (lexpr.getExpressionTag().equals(LogicalExpressionTag.FUNCTION_CALL)) {
+                sel = getSelectivityFromAnnotation(
+                        (AbstractFunctionCallExpression) afcExpr.getArguments().get(0).getValue(), join);
+                return 1.0 - sel;
+            }
+        }
+
+        double s = 1.0;
+        PredicateCardinalityAnnotation pca = afcExpr.getAnnotation(PredicateCardinalityAnnotation.class);
+        if (pca != null) {
+            s = pca.getSelectivity();
+            sel *= s;
+        } else {
+            JoinProductivityAnnotation jpa = afcExpr.getAnnotation(JoinProductivityAnnotation.class);
+            s = findJoinSelectivity(jpa, afcExpr);
+            sel *= s;
+        }
+        if (join && s == 1.0) {
+            // assume no selectivity was assigned
+            joinEnum.singleDatasetPreds.add(afcExpr);
+        }
+        return sel;
+    }
+
+    public double getSelectivityFromAnnotationMain(ILogicalExpression leExpr, boolean join) throws AlgebricksException {
+        double sel = 1.0;
+
+        if (leExpr.getExpressionTag().equals(LogicalExpressionTag.FUNCTION_CALL)) {
+            AbstractFunctionCallExpression afcExpr = (AbstractFunctionCallExpression) leExpr;
+            sel = getSelectivityFromAnnotation(afcExpr, join);
+        }
+
+        return sel;
+    }
+
+    // The next two routines should be combined and made more general
+    protected double getSelectivity(ILogicalOperator op, boolean join) throws AlgebricksException {
+        double sel = 1.0; // safe to return 1 if there is no annotation
+
+        if (op == null) {
+            return sel;
+        }
+
+        // find all the selectOperators here.
+        while (op.getOperatorTag() != LogicalOperatorTag.EMPTYTUPLESOURCE) {
+            if (op.getOperatorTag() == LogicalOperatorTag.SELECT) {
+                SelectOperator selOper = (SelectOperator) op;
+                sel *= getSelectivityFromAnnotationMain(selOper.getCondition().getValue(), join);
+            }
+            if (op.getOperatorTag() == LogicalOperatorTag.SUBPLAN) {
+                sel *= getSelectivity((SubplanOperator) op);
+            }
+            op = op.getInputs().get(0).getValue();
+        }
+        return sel;
+    }
+
+    protected double getSelectivity(SubplanOperator subplanOp) throws AlgebricksException {
+        double sel = 1.0; // safe to return 1 if there is no annotation
+        //ILogicalOperator op = subplanOp;
+        ILogicalOperator op = subplanOp.getNestedPlans().get(0).getRoots().get(0).getValue();
+        while (true) {
+            if (op.getOperatorTag() == LogicalOperatorTag.SELECT) {
+                SelectOperator selOper = (SelectOperator) op;
+                sel *= getSelectivityFromAnnotationMain(selOper.getCondition().getValue(), false);
+            }
+            if (op.getInputs().size() > 0) {
+                op = op.getInputs().get(0).getValue();
+            } else {
+                break;
+            }
+        }
+        return sel;
+    }
+}
diff --git a/asterixdb/asterix-app/pom.xml b/asterixdb/asterix-app/pom.xml
index 8262ce6..6f03f67 100644
--- a/asterixdb/asterix-app/pom.xml
+++ b/asterixdb/asterix-app/pom.xml
@@ -267,6 +267,7 @@
               <excludes combine.children="append">
                 <exclude>src/test/resources/**/results_parser_sqlpp/**</exclude>
                 <exclude>src/test/resources/**/results/**</exclude>
+                <exclude>src/test/resources/**/results_cbo/**</exclude>
                 <exclude>src/test/resources/fuzzyjoin/pub/fuzzy-join-aql*.dot</exclude>
                 <exclude>src/test/resources/fuzzyjoin/pub/fuzzy-join-aql*.json</exclude>
                 <exclude>**/data/**</exclude>
diff --git a/asterixdb/asterix-app/src/main/resources/cc.conf b/asterixdb/asterix-app/src/main/resources/cc.conf
index 98ede89..dc6e5a2 100644
--- a/asterixdb/asterix-app/src/main/resources/cc.conf
+++ b/asterixdb/asterix-app/src/main/resources/cc.conf
@@ -52,6 +52,9 @@
 [common]
 log.dir = logs/
 log.level = INFO
+compiler.cbo=false
+compiler.cbotest=true
+compiler.queryplanshape=zigzag
 compiler.framesize=32KB
 compiler.sortmemory=320KB
 compiler.groupmemory=160KB
diff --git a/asterixdb/asterix-app/src/main/resources/cc2.conf b/asterixdb/asterix-app/src/main/resources/cc2.conf
index 016c485..c746198 100644
--- a/asterixdb/asterix-app/src/main/resources/cc2.conf
+++ b/asterixdb/asterix-app/src/main/resources/cc2.conf
@@ -48,6 +48,9 @@
 [common]
 log.dir = logs/
 log.level = WARN
+compiler.cbo=false
+compiler.cbotest=true
+compiler.queryplanshape=zigzag
 compiler.framesize=32KB
 compiler.sortmemory=320KB
 compiler.groupmemory=160KB
diff --git a/asterixdb/asterix-app/src/main/resources/cc3.conf b/asterixdb/asterix-app/src/main/resources/cc3.conf
index 88362aa..8e9b5ab 100644
--- a/asterixdb/asterix-app/src/main/resources/cc3.conf
+++ b/asterixdb/asterix-app/src/main/resources/cc3.conf
@@ -48,6 +48,9 @@
 [common]
 log.dir = logs/
 log.level = WARN
+compiler.cbo=false
+compiler.cbotest=true
+compiler.queryplanshape=zigzag
 compiler.framesize=32KB
 compiler.sortmemory=320KB
 compiler.groupmemory=160KB
diff --git a/asterixdb/asterix-app/src/main/resources/cc_no_cbo.conf b/asterixdb/asterix-app/src/main/resources/cc_no_cbo.conf
new file mode 100644
index 0000000..deb92e0
--- /dev/null
+++ b/asterixdb/asterix-app/src/main/resources/cc_no_cbo.conf
@@ -0,0 +1,66 @@
+; Licensed to the Apache Software Foundation (ASF) under one
+; or more contributor license agreements.  See the NOTICE file
+; distributed with this work for additional information
+; regarding copyright ownership.  The ASF licenses this file
+; to you under the Apache License, Version 2.0 (the
+; "License"); you may not use this file except in compliance
+; with the License.  You may obtain a copy of the License at
+;
+;   http://www.apache.org/licenses/LICENSE-2.0
+;
+; Unless required by applicable law or agreed to in writing,
+; software distributed under the License is distributed on an
+; "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+; KIND, either express or implied.  See the License for the
+; specific language governing permissions and limitations
+; under the License.
+
+[nc/asterix_nc1]
+txn.log.dir=target/tmp/asterix_nc1/txnlog
+core.dump.dir=target/tmp/asterix_nc1/coredump
+iodevices=asterix_nc1/iodevice1
+iodevices=asterix_nc1/iodevice2
+nc.api.port=19004
+#jvm.args=-agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5006
+
+[nc/asterix_nc2]
+ncservice.port=9091
+txn.log.dir=target/tmp/asterix_nc2/txnlog
+core.dump.dir=target/tmp/asterix_nc2/coredump
+iodevices=asterix_nc2/iodevice1
+iodevices=asterix_nc2/iodevice2
+nc.api.port=19005
+#jvm.args=-agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5007
+
+[nc]
+address=127.0.0.1
+command=asterixnc
+app.class=org.apache.asterix.hyracks.bootstrap.NCApplication
+jvm.args=-Xmx4096m -Dnode.Resolver="org.apache.asterix.external.util.IdentitiyResolverFactory"
+storage.buffercache.pagesize=32KB
+storage.buffercache.size=128MB
+storage.memorycomponent.globalbudget=512MB
+storage.io.scheduler=greedy
+storage.filtered.memorycomponent.max.size=16MB
+
+[cc]
+address = 127.0.0.1
+app.class=org.apache.asterix.hyracks.bootstrap.CCApplication
+heartbeat.period=2000
+heartbeat.max.misses=25
+
+[common]
+log.dir = logs/
+log.level = INFO
+compiler.cbo=false
+compiler.cbotest=false
+compiler.framesize=32KB
+compiler.sortmemory=320KB
+compiler.groupmemory=160KB
+compiler.joinmemory=256KB
+compiler.textsearchmemory=160KB
+compiler.windowmemory=192KB
+compiler.sort.parallel=false
+compiler.internal.sanitycheck=true
+messaging.frame.size=4096
+messaging.frame.count=512
diff --git a/asterixdb/asterix-app/src/test/java/org/apache/asterix/test/common/TestExecutor.java b/asterixdb/asterix-app/src/test/java/org/apache/asterix/test/common/TestExecutor.java
index 14784c5..1fd1af1 100644
--- a/asterixdb/asterix-app/src/test/java/org/apache/asterix/test/common/TestExecutor.java
+++ b/asterixdb/asterix-app/src/test/java/org/apache/asterix/test/common/TestExecutor.java
@@ -326,7 +326,7 @@
 
     public void runScriptAndCompareWithResult(File scriptFile, File expectedFile, File actualFile,
             ComparisonEnum compare, Charset actualEncoding, String statement) throws Exception {
-        LOGGER.info("Expected results file: {} ", canonicalize(expectedFile));
+        LOGGER.info("Expected results file: {} ", canonicalize(expectedFile.getAbsolutePath()));
         boolean regex = false;
         if (expectedFile.getName().endsWith(".ignore")) {
             return; //skip the comparison
@@ -404,9 +404,10 @@
             }
         } catch (Exception e) {
             if (!actualEncoding.equals(UTF_8)) {
-                LOGGER.info("Actual results file: {} encoding: {}", canonicalize(actualFile), actualEncoding);
+                LOGGER.info("Actual results file: {} encoding: {}", canonicalize(actualFile.getAbsolutePath()),
+                        actualEncoding);
             } else {
-                LOGGER.info("Actual results file: {}", canonicalize(actualFile));
+                LOGGER.info("Actual results file: {}", canonicalize(actualFile.getAbsolutePath()));
             }
             throw e;
         }
diff --git a/asterixdb/asterix-app/src/test/java/org/apache/asterix/test/optimizer/OptimizerTest.java b/asterixdb/asterix-app/src/test/java/org/apache/asterix/test/optimizer/OptimizerTest.java
index f02b4d6..e15774b 100644
--- a/asterixdb/asterix-app/src/test/java/org/apache/asterix/test/optimizer/OptimizerTest.java
+++ b/asterixdb/asterix-app/src/test/java/org/apache/asterix/test/optimizer/OptimizerTest.java
@@ -58,6 +58,7 @@
     protected String expectedFilePath;
 
     static {
+        TEST_CONFIG_FILE_NAME = "src/main/resources/cc_no_cbo.conf";
         EXTENSION_RESULT = "plan";
         PATH_ACTUAL = "target" + SEPARATOR + "opttest" + SEPARATOR;
     }
diff --git a/asterixdb/asterix-app/src/test/resources/cc-compression.conf b/asterixdb/asterix-app/src/test/resources/cc-compression.conf
index c8d9780..373d9bb 100644
--- a/asterixdb/asterix-app/src/test/resources/cc-compression.conf
+++ b/asterixdb/asterix-app/src/test/resources/cc-compression.conf
@@ -47,6 +47,8 @@
 
 [common]
 log.level = INFO
+compiler.cbo=false
+compiler.cbotest=true
 compiler.framesize=32KB
 compiler.sortmemory=320KB
 compiler.groupmemory=160KB
diff --git a/asterixdb/asterix-app/src/test/resources/cc-ssl.conf b/asterixdb/asterix-app/src/test/resources/cc-ssl.conf
index 499e9fc..ff7e73b 100644
--- a/asterixdb/asterix-app/src/test/resources/cc-ssl.conf
+++ b/asterixdb/asterix-app/src/test/resources/cc-ssl.conf
@@ -59,6 +59,8 @@
 [common]
 log.dir = logs/
 log.level = INFO
+compiler.cbo=false
+compiler.cbotest=true
 compiler.framesize=32KB
 compiler.sortmemory=320KB
 compiler.groupmemory=160KB
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results/spatial_join/st_distance_static_partitioning.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results/spatial_join/st_distance_static_partitioning.plan
index 25546ce..f66785b 100644
--- a/asterixdb/asterix-app/src/test/resources/optimizerts/results/spatial_join/st_distance_static_partitioning.plan
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results/spatial_join/st_distance_static_partitioning.plan
@@ -7,10 +7,10 @@
             -- AGGREGATE  |PARTITIONED|
               -- STREAM_SELECT  |PARTITIONED|
                 -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
-                  -- SPATIAL_JOIN [$$61, $$56] [$$62, $$57]  |PARTITIONED|
+                  -- SPATIAL_JOIN [$$62, $$56] [$$63, $$57]  |PARTITIONED|
                     -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
-                      -- STABLE_SORT [$$61(ASC), $$56(ASC)]  |PARTITIONED|
-                        -- HASH_PARTITION_EXCHANGE [$$61]  |PARTITIONED|
+                      -- STABLE_SORT [$$62(ASC), $$56(ASC)]  |PARTITIONED|
+                        -- HASH_PARTITION_EXCHANGE [$$62]  |PARTITIONED|
                           -- UNNEST  |PARTITIONED|
                             -- ASSIGN  |PARTITIONED|
                               -- STREAM_PROJECT  |PARTITIONED|
@@ -21,8 +21,8 @@
                                         -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                                           -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
                     -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
-                      -- STABLE_SORT [$$62(ASC), $$57(ASC)]  |PARTITIONED|
-                        -- HASH_PARTITION_EXCHANGE [$$62]  |PARTITIONED|
+                      -- STABLE_SORT [$$63(ASC), $$57(ASC)]  |PARTITIONED|
+                        -- HASH_PARTITION_EXCHANGE [$$63]  |PARTITIONED|
                           -- UNNEST  |PARTITIONED|
                             -- ASSIGN  |PARTITIONED|
                               -- STREAM_PROJECT  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/aggregate-sql-sugar/distinct_mixed/distinct_mixed.10.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/aggregate-sql-sugar/distinct_mixed/distinct_mixed.10.plan
new file mode 100644
index 0000000..9ea1780
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/aggregate-sql-sugar/distinct_mixed/distinct_mixed.10.plan
@@ -0,0 +1,35 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- SORT_MERGE_EXCHANGE [$$g(ASC) ]  |PARTITIONED|
+          -- PRE_CLUSTERED_GROUP_BY[$$g]  |PARTITIONED|
+                  {
+                    -- AGGREGATE  |LOCAL|
+                      -- MICRO_PRE_SORTED_DISTINCT_BY  |LOCAL|
+                        -- MICRO_STABLE_SORT [$$67(ASC)]  |LOCAL|
+                          -- NESTED_TUPLE_SOURCE  |LOCAL|
+                  }
+            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+              -- STABLE_SORT [$$g(ASC)]  |PARTITIONED|
+                -- HASH_PARTITION_EXCHANGE [$$g]  |PARTITIONED|
+                  -- NESTED_LOOP  |PARTITIONED|
+                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                      -- NESTED_LOOP  |PARTITIONED|
+                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                          -- STREAM_PROJECT  |PARTITIONED|
+                            -- ASSIGN  |PARTITIONED|
+                              -- STREAM_PROJECT  |PARTITIONED|
+                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                  -- DATASOURCE_SCAN (test.d1)  |PARTITIONED|
+                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                      -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                        -- BROADCAST_EXCHANGE  |PARTITIONED|
+                          -- UNNEST  |UNPARTITIONED|
+                            -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
+                    -- BROADCAST_EXCHANGE  |PARTITIONED|
+                      -- STREAM_PROJECT  |PARTITIONED|
+                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                          -- DATASOURCE_SCAN (test.d2)  |PARTITIONED|
+                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                              -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/aggregate-sql-sugar/distinct_mixed/distinct_mixed.11.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/aggregate-sql-sugar/distinct_mixed/distinct_mixed.11.plan
new file mode 100644
index 0000000..ebfcfc2
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/aggregate-sql-sugar/distinct_mixed/distinct_mixed.11.plan
@@ -0,0 +1,43 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- SORT_MERGE_EXCHANGE [$$g(ASC) ]  |PARTITIONED|
+          -- PRE_CLUSTERED_GROUP_BY[$$g]  |PARTITIONED|
+                  {
+                    -- AGGREGATE  |LOCAL|
+                      -- MICRO_PRE_SORTED_DISTINCT_BY  |LOCAL|
+                        -- MICRO_STABLE_SORT [$$67(ASC)]  |LOCAL|
+                          -- NESTED_TUPLE_SOURCE  |LOCAL|
+                  }
+                  {
+                    -- AGGREGATE  |LOCAL|
+                      -- MICRO_PRE_SORTED_DISTINCT_BY  |LOCAL|
+                        -- MICRO_STABLE_SORT [$$72(ASC)]  |LOCAL|
+                          -- NESTED_TUPLE_SOURCE  |LOCAL|
+                  }
+            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+              -- STABLE_SORT [$$g(ASC)]  |PARTITIONED|
+                -- HASH_PARTITION_EXCHANGE [$$g]  |PARTITIONED|
+                  -- NESTED_LOOP  |PARTITIONED|
+                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                      -- NESTED_LOOP  |PARTITIONED|
+                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                          -- STREAM_PROJECT  |PARTITIONED|
+                            -- ASSIGN  |PARTITIONED|
+                              -- STREAM_PROJECT  |PARTITIONED|
+                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                  -- DATASOURCE_SCAN (test.d1)  |PARTITIONED|
+                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                      -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                        -- BROADCAST_EXCHANGE  |PARTITIONED|
+                          -- UNNEST  |UNPARTITIONED|
+                            -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
+                    -- BROADCAST_EXCHANGE  |PARTITIONED|
+                      -- STREAM_PROJECT  |PARTITIONED|
+                        -- ASSIGN  |PARTITIONED|
+                          -- STREAM_PROJECT  |PARTITIONED|
+                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                              -- DATASOURCE_SCAN (test.d2)  |PARTITIONED|
+                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                  -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/aggregate-sql-sugar/distinct_mixed/distinct_mixed.12.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/aggregate-sql-sugar/distinct_mixed/distinct_mixed.12.plan
new file mode 100644
index 0000000..a8f346f
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/aggregate-sql-sugar/distinct_mixed/distinct_mixed.12.plan
@@ -0,0 +1,39 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- SORT_MERGE_EXCHANGE [$$g(ASC) ]  |PARTITIONED|
+          -- PRE_CLUSTERED_GROUP_BY[$$g]  |PARTITIONED|
+                  {
+                    -- AGGREGATE  |LOCAL|
+                      -- NESTED_TUPLE_SOURCE  |LOCAL|
+                  }
+                  {
+                    -- AGGREGATE  |LOCAL|
+                      -- MICRO_PRE_SORTED_DISTINCT_BY  |LOCAL|
+                        -- MICRO_STABLE_SORT [$$71(ASC)]  |LOCAL|
+                          -- NESTED_TUPLE_SOURCE  |LOCAL|
+                  }
+            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+              -- STABLE_SORT [$$g(ASC)]  |PARTITIONED|
+                -- HASH_PARTITION_EXCHANGE [$$g]  |PARTITIONED|
+                  -- NESTED_LOOP  |PARTITIONED|
+                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                      -- NESTED_LOOP  |PARTITIONED|
+                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                          -- STREAM_PROJECT  |PARTITIONED|
+                            -- ASSIGN  |PARTITIONED|
+                              -- STREAM_PROJECT  |PARTITIONED|
+                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                  -- DATASOURCE_SCAN (test.d1)  |PARTITIONED|
+                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                      -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                        -- BROADCAST_EXCHANGE  |PARTITIONED|
+                          -- UNNEST  |UNPARTITIONED|
+                            -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
+                    -- BROADCAST_EXCHANGE  |PARTITIONED|
+                      -- STREAM_PROJECT  |PARTITIONED|
+                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                          -- DATASOURCE_SCAN (test.d2)  |PARTITIONED|
+                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                              -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/aggregate-sql-sugar/distinct_mixed/distinct_mixed.13.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/aggregate-sql-sugar/distinct_mixed/distinct_mixed.13.plan
new file mode 100644
index 0000000..439b1d4
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/aggregate-sql-sugar/distinct_mixed/distinct_mixed.13.plan
@@ -0,0 +1,57 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- SORT_MERGE_EXCHANGE [$$g(ASC) ]  |PARTITIONED|
+          -- PRE_CLUSTERED_GROUP_BY[$$g]  |PARTITIONED|
+                  {
+                    -- AGGREGATE  |LOCAL|
+                      -- MICRO_PRE_SORTED_DISTINCT_BY  |LOCAL|
+                        -- MICRO_STABLE_SORT [$$82(ASC)]  |LOCAL|
+                          -- NESTED_TUPLE_SOURCE  |LOCAL|
+                  }
+                  {
+                    -- AGGREGATE  |LOCAL|
+                      -- NESTED_TUPLE_SOURCE  |LOCAL|
+                  }
+                  {
+                    -- AGGREGATE  |LOCAL|
+                      -- MICRO_PRE_SORTED_DISTINCT_BY  |LOCAL|
+                        -- MICRO_STABLE_SORT [$$92(ASC)]  |LOCAL|
+                          -- NESTED_TUPLE_SOURCE  |LOCAL|
+                  }
+            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+              -- STABLE_SORT [$$g(ASC)]  |PARTITIONED|
+                -- HASH_PARTITION_EXCHANGE [$$g]  |PARTITIONED|
+                  -- NESTED_LOOP  |PARTITIONED|
+                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                      -- NESTED_LOOP  |PARTITIONED|
+                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                          -- NESTED_LOOP  |PARTITIONED|
+                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                              -- STREAM_PROJECT  |PARTITIONED|
+                                -- ASSIGN  |PARTITIONED|
+                                  -- STREAM_PROJECT  |PARTITIONED|
+                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                      -- DATASOURCE_SCAN (test.d1)  |PARTITIONED|
+                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                          -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                            -- BROADCAST_EXCHANGE  |PARTITIONED|
+                              -- UNNEST  |UNPARTITIONED|
+                                -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
+                        -- BROADCAST_EXCHANGE  |PARTITIONED|
+                          -- STREAM_PROJECT  |PARTITIONED|
+                            -- ASSIGN  |PARTITIONED|
+                              -- STREAM_PROJECT  |PARTITIONED|
+                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                  -- DATASOURCE_SCAN (test.d2)  |PARTITIONED|
+                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                      -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                    -- BROADCAST_EXCHANGE  |PARTITIONED|
+                      -- STREAM_PROJECT  |PARTITIONED|
+                        -- ASSIGN  |PARTITIONED|
+                          -- STREAM_PROJECT  |PARTITIONED|
+                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                              -- DATASOURCE_SCAN (test.d3)  |PARTITIONED|
+                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                  -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/aggregate-sql-sugar/distinct_mixed/distinct_mixed.14.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/aggregate-sql-sugar/distinct_mixed/distinct_mixed.14.plan
new file mode 100644
index 0000000..c57b6f9
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/aggregate-sql-sugar/distinct_mixed/distinct_mixed.14.plan
@@ -0,0 +1,63 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- SORT_MERGE_EXCHANGE [$$g(ASC) ]  |PARTITIONED|
+          -- PRE_CLUSTERED_GROUP_BY[$$g]  |PARTITIONED|
+                  {
+                    -- AGGREGATE  |LOCAL|
+                      -- MICRO_PRE_SORTED_DISTINCT_BY  |LOCAL|
+                        -- MICRO_STABLE_SORT [$$106(ASC)]  |LOCAL|
+                          -- NESTED_TUPLE_SOURCE  |LOCAL|
+                  }
+                  {
+                    -- AGGREGATE  |LOCAL|
+                      -- NESTED_TUPLE_SOURCE  |LOCAL|
+                  }
+                  {
+                    -- AGGREGATE  |LOCAL|
+                      -- MICRO_PRE_SORTED_DISTINCT_BY  |LOCAL|
+                        -- MICRO_STABLE_SORT [$$116(ASC)]  |LOCAL|
+                          -- NESTED_TUPLE_SOURCE  |LOCAL|
+                  }
+                  {
+                    -- AGGREGATE  |LOCAL|
+                      -- MICRO_PRE_SORTED_DISTINCT_BY  |LOCAL|
+                        -- MICRO_STABLE_SORT [$$111(ASC)]  |LOCAL|
+                          -- NESTED_TUPLE_SOURCE  |LOCAL|
+                  }
+            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+              -- STABLE_SORT [$$g(ASC)]  |PARTITIONED|
+                -- HASH_PARTITION_EXCHANGE [$$g]  |PARTITIONED|
+                  -- NESTED_LOOP  |PARTITIONED|
+                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                      -- NESTED_LOOP  |PARTITIONED|
+                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                          -- NESTED_LOOP  |PARTITIONED|
+                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                              -- STREAM_PROJECT  |PARTITIONED|
+                                -- ASSIGN  |PARTITIONED|
+                                  -- STREAM_PROJECT  |PARTITIONED|
+                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                      -- DATASOURCE_SCAN (test.d1)  |PARTITIONED|
+                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                          -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                            -- BROADCAST_EXCHANGE  |PARTITIONED|
+                              -- UNNEST  |UNPARTITIONED|
+                                -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
+                        -- BROADCAST_EXCHANGE  |PARTITIONED|
+                          -- STREAM_PROJECT  |PARTITIONED|
+                            -- ASSIGN  |PARTITIONED|
+                              -- STREAM_PROJECT  |PARTITIONED|
+                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                  -- DATASOURCE_SCAN (test.d2)  |PARTITIONED|
+                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                      -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                    -- BROADCAST_EXCHANGE  |PARTITIONED|
+                      -- STREAM_PROJECT  |PARTITIONED|
+                        -- ASSIGN  |PARTITIONED|
+                          -- STREAM_PROJECT  |PARTITIONED|
+                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                              -- DATASOURCE_SCAN (test.d3)  |PARTITIONED|
+                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                  -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/aggregate-sql-sugar/distinct_mixed/distinct_mixed.9.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/aggregate-sql-sugar/distinct_mixed/distinct_mixed.9.plan
new file mode 100644
index 0000000..8802ff5
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/aggregate-sql-sugar/distinct_mixed/distinct_mixed.9.plan
@@ -0,0 +1,35 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- SORT_MERGE_EXCHANGE [$$g(ASC) ]  |PARTITIONED|
+          -- PRE_CLUSTERED_GROUP_BY[$$g]  |PARTITIONED|
+                  {
+                    -- AGGREGATE  |LOCAL|
+                      -- MICRO_PRE_SORTED_DISTINCT_BY  |LOCAL|
+                        -- MICRO_STABLE_SORT [$$63(ASC)]  |LOCAL|
+                          -- NESTED_TUPLE_SOURCE  |LOCAL|
+                  }
+            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+              -- STABLE_SORT [$$g(ASC)]  |PARTITIONED|
+                -- HASH_PARTITION_EXCHANGE [$$g]  |PARTITIONED|
+                  -- NESTED_LOOP  |PARTITIONED|
+                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                      -- NESTED_LOOP  |PARTITIONED|
+                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                          -- STREAM_PROJECT  |PARTITIONED|
+                            -- ASSIGN  |PARTITIONED|
+                              -- STREAM_PROJECT  |PARTITIONED|
+                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                  -- DATASOURCE_SCAN (test.d1)  |PARTITIONED|
+                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                      -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                        -- BROADCAST_EXCHANGE  |PARTITIONED|
+                          -- UNNEST  |UNPARTITIONED|
+                            -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
+                    -- BROADCAST_EXCHANGE  |PARTITIONED|
+                      -- STREAM_PROJECT  |PARTITIONED|
+                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                          -- DATASOURCE_SCAN (test.d2)  |PARTITIONED|
+                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                              -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/btree-index-join/hints-indexnl-params/hints-indexnl-params-3.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/btree-index-join/hints-indexnl-params/hints-indexnl-params-3.plan
new file mode 100644
index 0000000..bd6d8cf
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/btree-index-join/hints-indexnl-params/hints-indexnl-params-3.plan
@@ -0,0 +1,25 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- SORT_MERGE_EXCHANGE [$$37(ASC) ]  |PARTITIONED|
+    -- STABLE_SORT [$$37(ASC)]  |PARTITIONED|
+      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+        -- STREAM_PROJECT  |PARTITIONED|
+          -- STREAM_SELECT  |PARTITIONED|
+            -- ASSIGN  |PARTITIONED|
+              -- STREAM_PROJECT  |PARTITIONED|
+                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                  -- BTREE_SEARCH (test.tenk2.tenk2)  |PARTITIONED|
+                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                      -- STABLE_SORT [$$42(ASC)]  |PARTITIONED|
+                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                          -- STREAM_PROJECT  |PARTITIONED|
+                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                              -- BTREE_SEARCH (test.tenk2.idx_tenk2_1k)  |PARTITIONED|
+                                -- BROADCAST_EXCHANGE  |PARTITIONED|
+                                  -- STREAM_PROJECT  |PARTITIONED|
+                                    -- ASSIGN  |PARTITIONED|
+                                      -- STREAM_PROJECT  |PARTITIONED|
+                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                          -- BTREE_SEARCH (test.tenk1.tenk1)  |PARTITIONED|
+                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                              -- ASSIGN  |PARTITIONED|
+                                                -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/btree-index-join/hints-indexnl-params/hints-indexnl-params-5.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/btree-index-join/hints-indexnl-params/hints-indexnl-params-5.plan
new file mode 100644
index 0000000..bd6d8cf
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/btree-index-join/hints-indexnl-params/hints-indexnl-params-5.plan
@@ -0,0 +1,25 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- SORT_MERGE_EXCHANGE [$$37(ASC) ]  |PARTITIONED|
+    -- STABLE_SORT [$$37(ASC)]  |PARTITIONED|
+      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+        -- STREAM_PROJECT  |PARTITIONED|
+          -- STREAM_SELECT  |PARTITIONED|
+            -- ASSIGN  |PARTITIONED|
+              -- STREAM_PROJECT  |PARTITIONED|
+                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                  -- BTREE_SEARCH (test.tenk2.tenk2)  |PARTITIONED|
+                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                      -- STABLE_SORT [$$42(ASC)]  |PARTITIONED|
+                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                          -- STREAM_PROJECT  |PARTITIONED|
+                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                              -- BTREE_SEARCH (test.tenk2.idx_tenk2_1k)  |PARTITIONED|
+                                -- BROADCAST_EXCHANGE  |PARTITIONED|
+                                  -- STREAM_PROJECT  |PARTITIONED|
+                                    -- ASSIGN  |PARTITIONED|
+                                      -- STREAM_PROJECT  |PARTITIONED|
+                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                          -- BTREE_SEARCH (test.tenk1.tenk1)  |PARTITIONED|
+                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                              -- ASSIGN  |PARTITIONED|
+                                                -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/btree-index-join/hints-indexnl-params/hints-indexnl-params-6.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/btree-index-join/hints-indexnl-params/hints-indexnl-params-6.plan
new file mode 100644
index 0000000..b6b4ba0
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/btree-index-join/hints-indexnl-params/hints-indexnl-params-6.plan
@@ -0,0 +1,24 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- SORT_MERGE_EXCHANGE [$$37(ASC) ]  |PARTITIONED|
+    -- STABLE_SORT [$$37(ASC)]  |PARTITIONED|
+      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+        -- STREAM_PROJECT  |PARTITIONED|
+          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+            -- HYBRID_HASH_JOIN [$$35][$$34]  |PARTITIONED|
+              -- HASH_PARTITION_EXCHANGE [$$35]  |PARTITIONED|
+                -- STREAM_PROJECT  |PARTITIONED|
+                  -- ASSIGN  |PARTITIONED|
+                    -- STREAM_PROJECT  |PARTITIONED|
+                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                        -- DATASOURCE_SCAN (test.tenk2)  |PARTITIONED|
+                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                            -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+              -- HASH_PARTITION_EXCHANGE [$$34]  |PARTITIONED|
+                -- STREAM_PROJECT  |PARTITIONED|
+                  -- ASSIGN  |PARTITIONED|
+                    -- STREAM_PROJECT  |PARTITIONED|
+                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                        -- BTREE_SEARCH (test.tenk1.tenk1)  |PARTITIONED|
+                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                            -- ASSIGN  |PARTITIONED|
+                              -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/btree-index-join/hints-indexnl-params/hints-indexnl-params-7.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/btree-index-join/hints-indexnl-params/hints-indexnl-params-7.plan
new file mode 100644
index 0000000..bd6d8cf
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/btree-index-join/hints-indexnl-params/hints-indexnl-params-7.plan
@@ -0,0 +1,25 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- SORT_MERGE_EXCHANGE [$$37(ASC) ]  |PARTITIONED|
+    -- STABLE_SORT [$$37(ASC)]  |PARTITIONED|
+      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+        -- STREAM_PROJECT  |PARTITIONED|
+          -- STREAM_SELECT  |PARTITIONED|
+            -- ASSIGN  |PARTITIONED|
+              -- STREAM_PROJECT  |PARTITIONED|
+                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                  -- BTREE_SEARCH (test.tenk2.tenk2)  |PARTITIONED|
+                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                      -- STABLE_SORT [$$42(ASC)]  |PARTITIONED|
+                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                          -- STREAM_PROJECT  |PARTITIONED|
+                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                              -- BTREE_SEARCH (test.tenk2.idx_tenk2_1k)  |PARTITIONED|
+                                -- BROADCAST_EXCHANGE  |PARTITIONED|
+                                  -- STREAM_PROJECT  |PARTITIONED|
+                                    -- ASSIGN  |PARTITIONED|
+                                      -- STREAM_PROJECT  |PARTITIONED|
+                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                          -- BTREE_SEARCH (test.tenk1.tenk1)  |PARTITIONED|
+                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                              -- ASSIGN  |PARTITIONED|
+                                                -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/btree-index-selection/disjunctive-predicate/disjunctive-predicate-1.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/btree-index-selection/disjunctive-predicate/disjunctive-predicate-1.plan
new file mode 100644
index 0000000..61695a3
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/btree-index-selection/disjunctive-predicate/disjunctive-predicate-1.plan
@@ -0,0 +1,12 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+        -- HYBRID_HASH_JOIN [$$20][$$21]  |PARTITIONED|
+          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+            -- DATASOURCE_SCAN (test.TestSet)  |PARTITIONED|
+              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+          -- BROADCAST_EXCHANGE  |PARTITIONED|
+            -- UNNEST  |UNPARTITIONED|
+              -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/btree-index-selection/disjunctive-predicate/disjunctive-predicate-2.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/btree-index-selection/disjunctive-predicate/disjunctive-predicate-2.plan
new file mode 100644
index 0000000..318f7d5
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/btree-index-selection/disjunctive-predicate/disjunctive-predicate-2.plan
@@ -0,0 +1,15 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+        -- HYBRID_HASH_JOIN [$$19][$$21]  |PARTITIONED|
+          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+            -- ASSIGN  |PARTITIONED|
+              -- STREAM_PROJECT  |PARTITIONED|
+                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                  -- DATASOURCE_SCAN (test.TestSet)  |PARTITIONED|
+                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                      -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+          -- BROADCAST_EXCHANGE  |PARTITIONED|
+            -- UNNEST  |UNPARTITIONED|
+              -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/btree-index-selection/hints-skip-index/hints-skip-index-11.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/btree-index-selection/hints-skip-index/hints-skip-index-11.plan
new file mode 100644
index 0000000..a2a9642
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/btree-index-selection/hints-skip-index/hints-skip-index-11.plan
@@ -0,0 +1,18 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- SORT_MERGE_EXCHANGE [$$23(ASC) ]  |PARTITIONED|
+    -- STABLE_SORT [$$23(ASC)]  |PARTITIONED|
+      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+        -- STREAM_PROJECT  |PARTITIONED|
+          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+            -- HYBRID_HASH_JOIN [$$20][$$22]  |PARTITIONED|
+              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                -- STREAM_PROJECT  |PARTITIONED|
+                  -- ASSIGN  |PARTITIONED|
+                    -- STREAM_PROJECT  |PARTITIONED|
+                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                        -- DATASOURCE_SCAN (test.tenk)  |PARTITIONED|
+                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                            -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+              -- BROADCAST_EXCHANGE  |PARTITIONED|
+                -- UNNEST  |UNPARTITIONED|
+                  -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/btree-index-selection/hints-skip-index/hints-skip-index-12.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/btree-index-selection/hints-skip-index/hints-skip-index-12.plan
new file mode 100644
index 0000000..a2a9642
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/btree-index-selection/hints-skip-index/hints-skip-index-12.plan
@@ -0,0 +1,18 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- SORT_MERGE_EXCHANGE [$$23(ASC) ]  |PARTITIONED|
+    -- STABLE_SORT [$$23(ASC)]  |PARTITIONED|
+      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+        -- STREAM_PROJECT  |PARTITIONED|
+          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+            -- HYBRID_HASH_JOIN [$$20][$$22]  |PARTITIONED|
+              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                -- STREAM_PROJECT  |PARTITIONED|
+                  -- ASSIGN  |PARTITIONED|
+                    -- STREAM_PROJECT  |PARTITIONED|
+                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                        -- DATASOURCE_SCAN (test.tenk)  |PARTITIONED|
+                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                            -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+              -- BROADCAST_EXCHANGE  |PARTITIONED|
+                -- UNNEST  |UNPARTITIONED|
+                  -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/ch2/ch2_q2.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/ch2/ch2_q2.plan
new file mode 100644
index 0000000..5090c1a
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/ch2/ch2_q2.plan
@@ -0,0 +1,162 @@
+-- DISTRIBUTE_RESULT  |UNPARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |UNPARTITIONED|
+    -- STREAM_LIMIT  |UNPARTITIONED|
+      -- STREAM_PROJECT  |PARTITIONED|
+        -- ASSIGN  |PARTITIONED|
+          -- SORT_MERGE_EXCHANGE [$$260(ASC), $$261(ASC), $$226(ASC) ]  |PARTITIONED|
+            -- STREAM_LIMIT  |PARTITIONED|
+              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                -- STABLE_SORT [topK: 100] [$$260(ASC), $$261(ASC), $$226(ASC)]  |PARTITIONED|
+                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                    -- STREAM_PROJECT  |PARTITIONED|
+                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                        -- HYBRID_HASH_JOIN [$$238][$$239]  |PARTITIONED|
+                          -- HASH_PARTITION_EXCHANGE [$$238]  |PARTITIONED|
+                            -- STREAM_PROJECT  |PARTITIONED|
+                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                -- HYBRID_HASH_JOIN [$$245][$$246]  |PARTITIONED|
+                                  -- HASH_PARTITION_EXCHANGE [$$245]  |PARTITIONED|
+                                    -- STREAM_PROJECT  |PARTITIONED|
+                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                        -- HYBRID_HASH_JOIN [$$251][$$228]  |PARTITIONED|
+                                          -- HASH_PARTITION_EXCHANGE [$$251]  |PARTITIONED|
+                                            -- STREAM_PROJECT  |PARTITIONED|
+                                              -- ASSIGN  |PARTITIONED|
+                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                    -- HYBRID_HASH_JOIN [$$226, $$240][$$227, $$249]  |PARTITIONED|
+                                                      -- HASH_PARTITION_EXCHANGE [$$226, $$240]  |PARTITIONED|
+                                                        -- STREAM_PROJECT  |PARTITIONED|
+                                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                            -- HYBRID_HASH_JOIN [$$s_i_id][$$226]  |PARTITIONED|
+                                                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                -- SORT_GROUP_BY[$$271]  |PARTITIONED|
+                                                                        {
+                                                                          -- AGGREGATE  |LOCAL|
+                                                                            -- NESTED_TUPLE_SOURCE  |LOCAL|
+                                                                        }
+                                                                  -- HASH_PARTITION_EXCHANGE [$$271]  |PARTITIONED|
+                                                                    -- SORT_GROUP_BY[$$225]  |PARTITIONED|
+                                                                            {
+                                                                              -- AGGREGATE  |LOCAL|
+                                                                                -- NESTED_TUPLE_SOURCE  |LOCAL|
+                                                                            }
+                                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                        -- STREAM_PROJECT  |PARTITIONED|
+                                                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                            -- HYBRID_HASH_JOIN [$$256][$$247]  |PARTITIONED|
+                                                                              -- HASH_PARTITION_EXCHANGE [$$256]  |PARTITIONED|
+                                                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                    -- HYBRID_HASH_JOIN [$$255][$$243]  |PARTITIONED|
+                                                                                      -- HASH_PARTITION_EXCHANGE [$$255]  |PARTITIONED|
+                                                                                        -- STREAM_PROJECT  |PARTITIONED|
+                                                                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                            -- HYBRID_HASH_JOIN [$$241][$$242]  |PARTITIONED|
+                                                                                              -- HASH_PARTITION_EXCHANGE [$$241]  |PARTITIONED|
+                                                                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                                                                  -- ASSIGN  |PARTITIONED|
+                                                                                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                                      -- REPLICATE  |PARTITIONED|
+                                                                                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                                          -- STREAM_PROJECT  |PARTITIONED|
+                                                                                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                                              -- DATASOURCE_SCAN (test.nation)  |PARTITIONED|
+                                                                                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                                                  -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                                                                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                                -- REPLICATE  |PARTITIONED|
+                                                                                                  -- HASH_PARTITION_EXCHANGE [$$242]  |PARTITIONED|
+                                                                                                    -- STREAM_PROJECT  |PARTITIONED|
+                                                                                                      -- STREAM_SELECT  |PARTITIONED|
+                                                                                                        -- ASSIGN  |PARTITIONED|
+                                                                                                          -- STREAM_PROJECT  |PARTITIONED|
+                                                                                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                                              -- DATASOURCE_SCAN (test.region)  |PARTITIONED|
+                                                                                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                                                  -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                                                                      -- HASH_PARTITION_EXCHANGE [$$243]  |PARTITIONED|
+                                                                                        -- STREAM_PROJECT  |PARTITIONED|
+                                                                                          -- ASSIGN  |PARTITIONED|
+                                                                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                              -- REPLICATE  |PARTITIONED|
+                                                                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                                  -- STREAM_PROJECT  |PARTITIONED|
+                                                                                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                                      -- DATASOURCE_SCAN (test.supplier)  |PARTITIONED|
+                                                                                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                                          -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                                                              -- HASH_PARTITION_EXCHANGE [$$247]  |PARTITIONED|
+                                                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                                                  -- ASSIGN  |PARTITIONED|
+                                                                                    -- ASSIGN  |PARTITIONED|
+                                                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                        -- REPLICATE  |PARTITIONED|
+                                                                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                            -- STREAM_PROJECT  |PARTITIONED|
+                                                                                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                                -- DATASOURCE_SCAN (test.stock)  |PARTITIONED|
+                                                                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                                    -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                                              -- HASH_PARTITION_EXCHANGE [$$226]  |PARTITIONED|
+                                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                                  -- STREAM_SELECT  |PARTITIONED|
+                                                                    -- ASSIGN  |PARTITIONED|
+                                                                      -- STREAM_PROJECT  |PARTITIONED|
+                                                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                          -- DATASOURCE_SCAN (test.item)  |PARTITIONED|
+                                                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                              -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                                      -- HASH_PARTITION_EXCHANGE [$$227, $$249]  |PARTITIONED|
+                                                        -- STREAM_PROJECT  |PARTITIONED|
+                                                          -- ASSIGN  |PARTITIONED|
+                                                            -- STREAM_PROJECT  |PARTITIONED|
+                                                              -- ASSIGN  |PARTITIONED|
+                                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                  -- REPLICATE  |PARTITIONED|
+                                                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                      -- STREAM_PROJECT  |PARTITIONED|
+                                                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                          -- DATASOURCE_SCAN (test.stock)  |PARTITIONED|
+                                                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                              -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                          -- HASH_PARTITION_EXCHANGE [$$228]  |PARTITIONED|
+                                            -- STREAM_PROJECT  |PARTITIONED|
+                                              -- ASSIGN  |PARTITIONED|
+                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                  -- ASSIGN  |PARTITIONED|
+                                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                      -- REPLICATE  |PARTITIONED|
+                                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                          -- STREAM_PROJECT  |PARTITIONED|
+                                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                              -- DATASOURCE_SCAN (test.supplier)  |PARTITIONED|
+                                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                  -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                  -- HASH_PARTITION_EXCHANGE [$$246]  |PARTITIONED|
+                                    -- STREAM_PROJECT  |PARTITIONED|
+                                      -- ASSIGN  |PARTITIONED|
+                                        -- STREAM_PROJECT  |PARTITIONED|
+                                          -- ASSIGN  |PARTITIONED|
+                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                              -- REPLICATE  |PARTITIONED|
+                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                  -- STREAM_PROJECT  |PARTITIONED|
+                                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                      -- DATASOURCE_SCAN (test.nation)  |PARTITIONED|
+                                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                          -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                            -- STREAM_PROJECT  |PARTITIONED|
+                              -- ASSIGN  |PARTITIONED|
+                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                  -- REPLICATE  |PARTITIONED|
+                                    -- HASH_PARTITION_EXCHANGE [$$242]  |PARTITIONED|
+                                      -- STREAM_PROJECT  |PARTITIONED|
+                                        -- STREAM_SELECT  |PARTITIONED|
+                                          -- ASSIGN  |PARTITIONED|
+                                            -- STREAM_PROJECT  |PARTITIONED|
+                                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                -- DATASOURCE_SCAN (test.region)  |PARTITIONED|
+                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                    -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/ch2/ch2_q21.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/ch2/ch2_q21.plan
new file mode 100644
index 0000000..dd60dcd
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/ch2/ch2_q21.plan
@@ -0,0 +1,116 @@
+-- DISTRIBUTE_RESULT  |UNPARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |UNPARTITIONED|
+    -- STREAM_LIMIT  |UNPARTITIONED|
+      -- STREAM_PROJECT  |PARTITIONED|
+        -- SORT_MERGE_EXCHANGE [$$su_name(ASC) ]  |PARTITIONED|
+          -- STREAM_PROJECT  |PARTITIONED|
+            -- ASSIGN  |PARTITIONED|
+              -- STREAM_LIMIT  |PARTITIONED|
+                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                  -- SORT_GROUP_BY[$$378]  |PARTITIONED|
+                          {
+                            -- AGGREGATE  |LOCAL|
+                              -- NESTED_TUPLE_SOURCE  |LOCAL|
+                          }
+                    -- HASH_PARTITION_EXCHANGE [$$378]  |PARTITIONED|
+                      -- SORT_GROUP_BY[$$su_name]  |PARTITIONED|
+                              {
+                                -- AGGREGATE  |LOCAL|
+                                  -- NESTED_TUPLE_SOURCE  |LOCAL|
+                              }
+                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                          -- STREAM_PROJECT  |PARTITIONED|
+                            -- STREAM_SELECT  |PARTITIONED|
+                              -- STREAM_PROJECT  |PARTITIONED|
+                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                  -- SORT_GROUP_BY[$$369, $$370, $$371, $$372, $$373, $$374, $$375, $$376]  |PARTITIONED|
+                                          {
+                                            -- AGGREGATE  |LOCAL|
+                                              -- NESTED_TUPLE_SOURCE  |LOCAL|
+                                          }
+                                    -- HASH_PARTITION_EXCHANGE [$$369, $$370, $$371, $$372, $$373, $$374, $$375, $$376]  |PARTITIONED|
+                                      -- SORT_GROUP_BY[$$331, $$357, $$356, $$333, $$334, $$330, $$329, $$358]  |PARTITIONED|
+                                              {
+                                                -- AGGREGATE  |LOCAL|
+                                                  -- NESTED_TUPLE_SOURCE  |LOCAL|
+                                              }
+                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                          -- STREAM_PROJECT  |PARTITIONED|
+                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                              -- NESTED_LOOP  |PARTITIONED|
+                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                  -- STREAM_PROJECT  |PARTITIONED|
+                                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                      -- HYBRID_HASH_JOIN [$$344][$$333]  |PARTITIONED|
+                                                        -- HASH_PARTITION_EXCHANGE [$$344]  |PARTITIONED|
+                                                          -- STREAM_PROJECT  |PARTITIONED|
+                                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                              -- HYBRID_HASH_JOIN [$$345][$$334]  |PARTITIONED|
+                                                                -- HASH_PARTITION_EXCHANGE [$$345]  |PARTITIONED|
+                                                                  -- STREAM_PROJECT  |PARTITIONED|
+                                                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                      -- HYBRID_HASH_JOIN [$$330, $$329][$$331, $$341]  |PARTITIONED|
+                                                                        -- HASH_PARTITION_EXCHANGE [$$330, $$329]  |PARTITIONED|
+                                                                          -- ASSIGN  |PARTITIONED|
+                                                                            -- STREAM_PROJECT  |PARTITIONED|
+                                                                              -- ASSIGN  |PARTITIONED|
+                                                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                    -- DATASOURCE_SCAN (test.stock)  |PARTITIONED|
+                                                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                        -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                                                        -- HASH_PARTITION_EXCHANGE [$$331, $$341]  |PARTITIONED|
+                                                                          -- STREAM_PROJECT  |PARTITIONED|
+                                                                            -- STREAM_SELECT  |PARTITIONED|
+                                                                              -- STREAM_PROJECT  |PARTITIONED|
+                                                                                -- ASSIGN  |PARTITIONED|
+                                                                                  -- STREAM_PROJECT  |PARTITIONED|
+                                                                                    -- UNNEST  |PARTITIONED|
+                                                                                      -- STREAM_SELECT  |PARTITIONED|
+                                                                                        -- STREAM_PROJECT  |PARTITIONED|
+                                                                                          -- ASSIGN  |PARTITIONED|
+                                                                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                              -- REPLICATE  |PARTITIONED|
+                                                                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                                  -- STREAM_PROJECT  |PARTITIONED|
+                                                                                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                                      -- DATASOURCE_SCAN (test.orders)  |PARTITIONED|
+                                                                                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                                          -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                                                -- HASH_PARTITION_EXCHANGE [$$334]  |PARTITIONED|
+                                                                  -- STREAM_PROJECT  |PARTITIONED|
+                                                                    -- ASSIGN  |PARTITIONED|
+                                                                      -- STREAM_PROJECT  |PARTITIONED|
+                                                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                          -- DATASOURCE_SCAN (test.supplier)  |PARTITIONED|
+                                                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                              -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                                        -- HASH_PARTITION_EXCHANGE [$$333]  |PARTITIONED|
+                                                          -- STREAM_PROJECT  |PARTITIONED|
+                                                            -- STREAM_SELECT  |PARTITIONED|
+                                                              -- ASSIGN  |PARTITIONED|
+                                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                    -- DATASOURCE_SCAN (test.nation)  |PARTITIONED|
+                                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                        -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                                -- BROADCAST_EXCHANGE  |PARTITIONED|
+                                                  -- ASSIGN  |PARTITIONED|
+                                                    -- STREAM_PROJECT  |PARTITIONED|
+                                                      -- ASSIGN  |PARTITIONED|
+                                                        -- STREAM_PROJECT  |PARTITIONED|
+                                                          -- UNNEST  |PARTITIONED|
+                                                            -- STREAM_PROJECT  |PARTITIONED|
+                                                              -- STREAM_SELECT  |PARTITIONED|
+                                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                                  -- ASSIGN  |PARTITIONED|
+                                                                    -- STREAM_PROJECT  |PARTITIONED|
+                                                                      -- ASSIGN  |PARTITIONED|
+                                                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                          -- REPLICATE  |PARTITIONED|
+                                                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                              -- STREAM_PROJECT  |PARTITIONED|
+                                                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                  -- DATASOURCE_SCAN (test.orders)  |PARTITIONED|
+                                                                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                      -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/ch2/ch2_q5.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/ch2/ch2_q5.plan
new file mode 100644
index 0000000..165db4cc
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/ch2/ch2_q5.plan
@@ -0,0 +1,98 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- SORT_MERGE_EXCHANGE [$#2(DESC) ]  |PARTITIONED|
+          -- STABLE_SORT [$#2(DESC)]  |PARTITIONED|
+            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+              -- STREAM_PROJECT  |PARTITIONED|
+                -- ASSIGN  |PARTITIONED|
+                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                    -- SORT_GROUP_BY[$$278]  |PARTITIONED|
+                            {
+                              -- AGGREGATE  |LOCAL|
+                                -- NESTED_TUPLE_SOURCE  |LOCAL|
+                            }
+                      -- HASH_PARTITION_EXCHANGE [$$278]  |PARTITIONED|
+                        -- SORT_GROUP_BY[$$261]  |PARTITIONED|
+                                {
+                                  -- AGGREGATE  |LOCAL|
+                                    -- NESTED_TUPLE_SOURCE  |LOCAL|
+                                }
+                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                            -- STREAM_PROJECT  |PARTITIONED|
+                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                -- HYBRID_HASH_JOIN [$$260, $$276][$$252, $$255]  |PARTITIONED|
+                                  -- HASH_PARTITION_EXCHANGE [$$260, $$276]  |PARTITIONED|
+                                    -- STREAM_PROJECT  |PARTITIONED|
+                                      -- ASSIGN  |PARTITIONED|
+                                        -- STREAM_PROJECT  |PARTITIONED|
+                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                            -- HYBRID_HASH_JOIN [$$240, $$267][$$231, $$232]  |PARTITIONED|
+                                              -- HASH_PARTITION_EXCHANGE [$$240, $$267]  |PARTITIONED|
+                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                    -- HYBRID_HASH_JOIN [$$262, $$263, $$264][$$246, $$240, $$249]  |PARTITIONED|
+                                                      -- HASH_PARTITION_EXCHANGE [$$262, $$263, $$264]  |PARTITIONED|
+                                                        -- STREAM_PROJECT  |PARTITIONED|
+                                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                            -- HYBRID_HASH_JOIN [$$260][$$244]  |PARTITIONED|
+                                                              -- HASH_PARTITION_EXCHANGE [$$260]  |PARTITIONED|
+                                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                    -- HYBRID_HASH_JOIN [$$242][$$243]  |PARTITIONED|
+                                                                      -- HASH_PARTITION_EXCHANGE [$$242]  |PARTITIONED|
+                                                                        -- STREAM_PROJECT  |PARTITIONED|
+                                                                          -- ASSIGN  |PARTITIONED|
+                                                                            -- STREAM_PROJECT  |PARTITIONED|
+                                                                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                -- DATASOURCE_SCAN (test.nation)  |PARTITIONED|
+                                                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                    -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                                                      -- HASH_PARTITION_EXCHANGE [$$243]  |PARTITIONED|
+                                                                        -- STREAM_PROJECT  |PARTITIONED|
+                                                                          -- STREAM_SELECT  |PARTITIONED|
+                                                                            -- ASSIGN  |PARTITIONED|
+                                                                              -- STREAM_PROJECT  |PARTITIONED|
+                                                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                  -- DATASOURCE_SCAN (test.region)  |PARTITIONED|
+                                                                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                      -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                                              -- HASH_PARTITION_EXCHANGE [$$244]  |PARTITIONED|
+                                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                                  -- ASSIGN  |PARTITIONED|
+                                                                    -- STREAM_PROJECT  |PARTITIONED|
+                                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                        -- DATASOURCE_SCAN (test.customer)  |PARTITIONED|
+                                                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                            -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                                      -- HASH_PARTITION_EXCHANGE [$$246, $$240, $$249]  |PARTITIONED|
+                                                        -- STREAM_PROJECT  |PARTITIONED|
+                                                          -- ASSIGN  |PARTITIONED|
+                                                            -- STREAM_PROJECT  |PARTITIONED|
+                                                              -- UNNEST  |PARTITIONED|
+                                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                                  -- STREAM_SELECT  |PARTITIONED|
+                                                                    -- STREAM_PROJECT  |PARTITIONED|
+                                                                      -- ASSIGN  |PARTITIONED|
+                                                                        -- STREAM_PROJECT  |PARTITIONED|
+                                                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                            -- DATASOURCE_SCAN (test.orders)  |PARTITIONED|
+                                                                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                              -- HASH_PARTITION_EXCHANGE [$$231, $$232]  |PARTITIONED|
+                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                  -- ASSIGN  |PARTITIONED|
+                                                    -- STREAM_PROJECT  |PARTITIONED|
+                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                        -- DATASOURCE_SCAN (test.stock)  |PARTITIONED|
+                                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                            -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                  -- HASH_PARTITION_EXCHANGE [$$252, $$255]  |PARTITIONED|
+                                    -- STREAM_PROJECT  |PARTITIONED|
+                                      -- ASSIGN  |PARTITIONED|
+                                        -- STREAM_PROJECT  |PARTITIONED|
+                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                            -- DATASOURCE_SCAN (test.supplier)  |PARTITIONED|
+                                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/ch2/ch2_q7.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/ch2/ch2_q7.plan
new file mode 100644
index 0000000..f50b5a9
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/ch2/ch2_q7.plan
@@ -0,0 +1,104 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- SORT_MERGE_EXCHANGE [$$su_nationkey(ASC), $#1(ASC), $#2(ASC) ]  |PARTITIONED|
+          -- SORT_GROUP_BY[$$311, $$312, $$313]  |PARTITIONED|
+                  {
+                    -- AGGREGATE  |LOCAL|
+                      -- NESTED_TUPLE_SOURCE  |LOCAL|
+                  }
+            -- HASH_PARTITION_EXCHANGE [$$311, $$312, $$313]  |PARTITIONED|
+              -- SORT_GROUP_BY[$$262, $$258, $$259]  |PARTITIONED|
+                      {
+                        -- AGGREGATE  |LOCAL|
+                          -- NESTED_TUPLE_SOURCE  |LOCAL|
+                      }
+                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                  -- STREAM_PROJECT  |PARTITIONED|
+                    -- ASSIGN  |PARTITIONED|
+                      -- STREAM_PROJECT  |PARTITIONED|
+                        -- STREAM_SELECT  |PARTITIONED|
+                          -- STREAM_PROJECT  |PARTITIONED|
+                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                              -- HYBRID_HASH_JOIN [$$262][$$288]  |PARTITIONED|
+                                -- HASH_PARTITION_EXCHANGE [$$262]  |PARTITIONED|
+                                  -- STREAM_PROJECT  |PARTITIONED|
+                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                      -- HYBRID_HASH_JOIN [$$309][$$285]  |PARTITIONED|
+                                        -- HASH_PARTITION_EXCHANGE [$$309]  |PARTITIONED|
+                                          -- STREAM_PROJECT  |PARTITIONED|
+                                            -- ASSIGN  |PARTITIONED|
+                                              -- STREAM_PROJECT  |PARTITIONED|
+                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                  -- HYBRID_HASH_JOIN [$$295, $$296][$$260, $$261]  |PARTITIONED|
+                                                    -- HASH_PARTITION_EXCHANGE [$$295, $$296]  |PARTITIONED|
+                                                      -- STREAM_PROJECT  |PARTITIONED|
+                                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                          -- HYBRID_HASH_JOIN [$$290, $$291, $$292][$$276, $$278, $$280]  |PARTITIONED|
+                                                            -- HASH_PARTITION_EXCHANGE [$$290, $$291, $$292]  |PARTITIONED|
+                                                              -- STREAM_PROJECT  |PARTITIONED|
+                                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                  -- HYBRID_HASH_JOIN [$$289][$$273]  |PARTITIONED|
+                                                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                      -- REPLICATE  |PARTITIONED|
+                                                                        -- HASH_PARTITION_EXCHANGE [$$289]  |PARTITIONED|
+                                                                          -- STREAM_PROJECT  |PARTITIONED|
+                                                                            -- ASSIGN  |PARTITIONED|
+                                                                              -- STREAM_PROJECT  |PARTITIONED|
+                                                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                  -- DATASOURCE_SCAN (test.nation)  |PARTITIONED|
+                                                                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                      -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                                                    -- HASH_PARTITION_EXCHANGE [$$273]  |PARTITIONED|
+                                                                      -- ASSIGN  |PARTITIONED|
+                                                                        -- STREAM_PROJECT  |PARTITIONED|
+                                                                          -- ASSIGN  |PARTITIONED|
+                                                                            -- STREAM_PROJECT  |PARTITIONED|
+                                                                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                -- DATASOURCE_SCAN (test.customer)  |PARTITIONED|
+                                                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                    -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                                            -- HASH_PARTITION_EXCHANGE [$$276, $$278, $$280]  |PARTITIONED|
+                                                              -- STREAM_PROJECT  |PARTITIONED|
+                                                                -- STREAM_SELECT  |PARTITIONED|
+                                                                  -- STREAM_PROJECT  |PARTITIONED|
+                                                                    -- ASSIGN  |PARTITIONED|
+                                                                      -- STREAM_PROJECT  |PARTITIONED|
+                                                                        -- UNNEST  |PARTITIONED|
+                                                                          -- STREAM_PROJECT  |PARTITIONED|
+                                                                            -- ASSIGN  |PARTITIONED|
+                                                                              -- STREAM_PROJECT  |PARTITIONED|
+                                                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                  -- DATASOURCE_SCAN (test.orders)  |PARTITIONED|
+                                                                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                      -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                                    -- HASH_PARTITION_EXCHANGE [$$260, $$261]  |PARTITIONED|
+                                                      -- STREAM_PROJECT  |PARTITIONED|
+                                                        -- ASSIGN  |PARTITIONED|
+                                                          -- STREAM_PROJECT  |PARTITIONED|
+                                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                              -- DATASOURCE_SCAN (test.stock)  |PARTITIONED|
+                                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                  -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                        -- HASH_PARTITION_EXCHANGE [$$285]  |PARTITIONED|
+                                          -- STREAM_PROJECT  |PARTITIONED|
+                                            -- ASSIGN  |PARTITIONED|
+                                              -- STREAM_PROJECT  |PARTITIONED|
+                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                  -- DATASOURCE_SCAN (test.supplier)  |PARTITIONED|
+                                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                      -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                  -- STREAM_PROJECT  |PARTITIONED|
+                                    -- ASSIGN  |PARTITIONED|
+                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                        -- REPLICATE  |PARTITIONED|
+                                          -- HASH_PARTITION_EXCHANGE [$$289]  |PARTITIONED|
+                                            -- STREAM_PROJECT  |PARTITIONED|
+                                              -- ASSIGN  |PARTITIONED|
+                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                    -- DATASOURCE_SCAN (test.nation)  |PARTITIONED|
+                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                        -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/ch2/ch2_q8.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/ch2/ch2_q8.plan
new file mode 100644
index 0000000..34a9df6
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/ch2/ch2_q8.plan
@@ -0,0 +1,128 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- SORT_MERGE_EXCHANGE [$#1(ASC) ]  |PARTITIONED|
+          -- SORT_GROUP_BY[$$334]  |PARTITIONED|
+                  {
+                    -- AGGREGATE  |LOCAL|
+                      -- NESTED_TUPLE_SOURCE  |LOCAL|
+                  }
+            -- HASH_PARTITION_EXCHANGE [$$334]  |PARTITIONED|
+              -- SORT_GROUP_BY[$$278]  |PARTITIONED|
+                      {
+                        -- AGGREGATE  |LOCAL|
+                          -- NESTED_TUPLE_SOURCE  |LOCAL|
+                      }
+                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                  -- STREAM_PROJECT  |PARTITIONED|
+                    -- ASSIGN  |PARTITIONED|
+                      -- STREAM_PROJECT  |PARTITIONED|
+                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                          -- HYBRID_HASH_JOIN [$$309][$$310]  |PARTITIONED|
+                            -- HASH_PARTITION_EXCHANGE [$$309]  |PARTITIONED|
+                              -- STREAM_PROJECT  |PARTITIONED|
+                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                  -- HYBRID_HASH_JOIN [$$331][$$325]  |PARTITIONED|
+                                    -- HASH_PARTITION_EXCHANGE [$$331]  |PARTITIONED|
+                                      -- STREAM_PROJECT  |PARTITIONED|
+                                        -- ASSIGN  |PARTITIONED|
+                                          -- STREAM_PROJECT  |PARTITIONED|
+                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                              -- HYBRID_HASH_JOIN [$$290, $$320][$$280, $$279]  |PARTITIONED|
+                                                -- HASH_PARTITION_EXCHANGE [$$290, $$320]  |PARTITIONED|
+                                                  -- STREAM_PROJECT  |PARTITIONED|
+                                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                      -- HYBRID_HASH_JOIN [$$292][$$293]  |PARTITIONED|
+                                                        -- HASH_PARTITION_EXCHANGE [$$292]  |PARTITIONED|
+                                                          -- STREAM_PROJECT  |PARTITIONED|
+                                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                              -- HYBRID_HASH_JOIN [$$295][$$315]  |PARTITIONED|
+                                                                -- HASH_PARTITION_EXCHANGE [$$295]  |PARTITIONED|
+                                                                  -- STREAM_PROJECT  |PARTITIONED|
+                                                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                      -- HYBRID_HASH_JOIN [$$297, $$299, $$301][$$317, $$318, $$316]  |PARTITIONED|
+                                                                        -- HASH_PARTITION_EXCHANGE [$$297, $$299, $$301]  |PARTITIONED|
+                                                                          -- STREAM_PROJECT  |PARTITIONED|
+                                                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                              -- HYBRID_HASH_JOIN [$$290][$$308]  |PARTITIONED|
+                                                                                -- HASH_PARTITION_EXCHANGE [$$290]  |PARTITIONED|
+                                                                                  -- STREAM_SELECT  |PARTITIONED|
+                                                                                    -- STREAM_PROJECT  |PARTITIONED|
+                                                                                      -- ASSIGN  |PARTITIONED|
+                                                                                        -- STREAM_PROJECT  |PARTITIONED|
+                                                                                          -- UNNEST  |PARTITIONED|
+                                                                                            -- STREAM_SELECT  |PARTITIONED|
+                                                                                              -- STREAM_PROJECT  |PARTITIONED|
+                                                                                                -- ASSIGN  |PARTITIONED|
+                                                                                                  -- STREAM_PROJECT  |PARTITIONED|
+                                                                                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                                      -- DATASOURCE_SCAN (test.orders)  |PARTITIONED|
+                                                                                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                                          -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                                                                -- HASH_PARTITION_EXCHANGE [$$308]  |PARTITIONED|
+                                                                                  -- STREAM_PROJECT  |PARTITIONED|
+                                                                                    -- STREAM_SELECT  |PARTITIONED|
+                                                                                      -- ASSIGN  |PARTITIONED|
+                                                                                        -- STREAM_PROJECT  |PARTITIONED|
+                                                                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                            -- DATASOURCE_SCAN (test.item)  |PARTITIONED|
+                                                                                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                                -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                                                        -- HASH_PARTITION_EXCHANGE [$$317, $$318, $$316]  |PARTITIONED|
+                                                                          -- STREAM_PROJECT  |PARTITIONED|
+                                                                            -- ASSIGN  |PARTITIONED|
+                                                                              -- STREAM_PROJECT  |PARTITIONED|
+                                                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                  -- DATASOURCE_SCAN (test.customer)  |PARTITIONED|
+                                                                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                      -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                                                -- HASH_PARTITION_EXCHANGE [$$315]  |PARTITIONED|
+                                                                  -- STREAM_PROJECT  |PARTITIONED|
+                                                                    -- ASSIGN  |PARTITIONED|
+                                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                        -- REPLICATE  |PARTITIONED|
+                                                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                            -- STREAM_PROJECT  |PARTITIONED|
+                                                                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                -- DATASOURCE_SCAN (test.nation)  |PARTITIONED|
+                                                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                    -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                                        -- HASH_PARTITION_EXCHANGE [$$293]  |PARTITIONED|
+                                                          -- STREAM_PROJECT  |PARTITIONED|
+                                                            -- STREAM_SELECT  |PARTITIONED|
+                                                              -- ASSIGN  |PARTITIONED|
+                                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                    -- DATASOURCE_SCAN (test.region)  |PARTITIONED|
+                                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                        -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                                -- HASH_PARTITION_EXCHANGE [$$280, $$279]  |PARTITIONED|
+                                                  -- STREAM_PROJECT  |PARTITIONED|
+                                                    -- ASSIGN  |PARTITIONED|
+                                                      -- STREAM_PROJECT  |PARTITIONED|
+                                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                          -- DATASOURCE_SCAN (test.stock)  |PARTITIONED|
+                                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                              -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                    -- HASH_PARTITION_EXCHANGE [$$325]  |PARTITIONED|
+                                      -- STREAM_PROJECT  |PARTITIONED|
+                                        -- ASSIGN  |PARTITIONED|
+                                          -- STREAM_PROJECT  |PARTITIONED|
+                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                              -- DATASOURCE_SCAN (test.supplier)  |PARTITIONED|
+                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                  -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                            -- HASH_PARTITION_EXCHANGE [$$310]  |PARTITIONED|
+                              -- STREAM_PROJECT  |PARTITIONED|
+                                -- ASSIGN  |PARTITIONED|
+                                  -- STREAM_PROJECT  |PARTITIONED|
+                                    -- ASSIGN  |PARTITIONED|
+                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                        -- REPLICATE  |PARTITIONED|
+                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                            -- STREAM_PROJECT  |PARTITIONED|
+                                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                -- DATASOURCE_SCAN (test.nation)  |PARTITIONED|
+                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                    -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/ch2/ch2_q9.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/ch2/ch2_q9.plan
new file mode 100644
index 0000000..5557daa
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/ch2/ch2_q9.plan
@@ -0,0 +1,81 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- SORT_MERGE_EXCHANGE [$$n_name(ASC), $#1(DESC) ]  |PARTITIONED|
+          -- SORT_GROUP_BY[$$218, $$219]  |PARTITIONED|
+                  {
+                    -- AGGREGATE  |LOCAL|
+                      -- NESTED_TUPLE_SOURCE  |LOCAL|
+                  }
+            -- HASH_PARTITION_EXCHANGE [$$218, $$219]  |PARTITIONED|
+              -- SORT_GROUP_BY[$$213, $$186]  |PARTITIONED|
+                      {
+                        -- AGGREGATE  |LOCAL|
+                          -- NESTED_TUPLE_SOURCE  |LOCAL|
+                      }
+                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                  -- STREAM_PROJECT  |PARTITIONED|
+                    -- ASSIGN  |PARTITIONED|
+                      -- STREAM_PROJECT  |PARTITIONED|
+                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                          -- HYBRID_HASH_JOIN [$$201][$$202]  |PARTITIONED|
+                            -- HASH_PARTITION_EXCHANGE [$$201]  |PARTITIONED|
+                              -- STREAM_PROJECT  |PARTITIONED|
+                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                  -- HYBRID_HASH_JOIN [$$216][$$212]  |PARTITIONED|
+                                    -- HASH_PARTITION_EXCHANGE [$$216]  |PARTITIONED|
+                                      -- STREAM_PROJECT  |PARTITIONED|
+                                        -- ASSIGN  |PARTITIONED|
+                                          -- STREAM_PROJECT  |PARTITIONED|
+                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                              -- HYBRID_HASH_JOIN [$$194, $$205][$$188, $$187]  |PARTITIONED|
+                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                  -- STREAM_PROJECT  |PARTITIONED|
+                                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                      -- HYBRID_HASH_JOIN [$$194][$$195]  |PARTITIONED|
+                                                        -- HASH_PARTITION_EXCHANGE [$$194]  |PARTITIONED|
+                                                          -- STREAM_PROJECT  |PARTITIONED|
+                                                            -- ASSIGN  |PARTITIONED|
+                                                              -- STREAM_PROJECT  |PARTITIONED|
+                                                                -- UNNEST  |PARTITIONED|
+                                                                  -- STREAM_PROJECT  |PARTITIONED|
+                                                                    -- ASSIGN  |PARTITIONED|
+                                                                      -- STREAM_PROJECT  |PARTITIONED|
+                                                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                          -- DATASOURCE_SCAN (test.orders)  |PARTITIONED|
+                                                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                              -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                                        -- HASH_PARTITION_EXCHANGE [$$195]  |PARTITIONED|
+                                                          -- STREAM_PROJECT  |PARTITIONED|
+                                                            -- STREAM_SELECT  |PARTITIONED|
+                                                              -- ASSIGN  |PARTITIONED|
+                                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                    -- DATASOURCE_SCAN (test.item)  |PARTITIONED|
+                                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                        -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                                -- HASH_PARTITION_EXCHANGE [$$188]  |PARTITIONED|
+                                                  -- STREAM_PROJECT  |PARTITIONED|
+                                                    -- ASSIGN  |PARTITIONED|
+                                                      -- STREAM_PROJECT  |PARTITIONED|
+                                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                          -- DATASOURCE_SCAN (test.stock)  |PARTITIONED|
+                                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                              -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                    -- HASH_PARTITION_EXCHANGE [$$212]  |PARTITIONED|
+                                      -- STREAM_PROJECT  |PARTITIONED|
+                                        -- ASSIGN  |PARTITIONED|
+                                          -- STREAM_PROJECT  |PARTITIONED|
+                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                              -- DATASOURCE_SCAN (test.supplier)  |PARTITIONED|
+                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                  -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                            -- HASH_PARTITION_EXCHANGE [$$202]  |PARTITIONED|
+                              -- STREAM_PROJECT  |PARTITIONED|
+                                -- ASSIGN  |PARTITIONED|
+                                  -- STREAM_PROJECT  |PARTITIONED|
+                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                      -- DATASOURCE_SCAN (test.nation)  |PARTITIONED|
+                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                          -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/collocated.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/collocated.plan
new file mode 100644
index 0000000..0f4f7a3
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/collocated.plan
@@ -0,0 +1,11 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- STREAM_PROJECT  |PARTITIONED|
+          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+            -- BTREE_SEARCH (colocated.Visitors.Visitors)  |PARTITIONED|
+              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                -- DATASOURCE_SCAN (colocated.Users)  |PARTITIONED|
+                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                    -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/denorm-cust-order.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/denorm-cust-order.plan
new file mode 100644
index 0000000..0133d09
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/denorm-cust-order.plan
@@ -0,0 +1,23 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+          -- PRE_CLUSTERED_GROUP_BY[$$93]  |PARTITIONED|
+                  {
+                    -- AGGREGATE  |LOCAL|
+                      -- NESTED_TUPLE_SOURCE  |LOCAL|
+                  }
+            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+              -- STREAM_PROJECT  |PARTITIONED|
+                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                  -- BTREE_SEARCH (custorder.Customers.Customers)  |PARTITIONED|
+                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                      -- STABLE_SORT [$$95(ASC)]  |PARTITIONED|
+                        -- HASH_PARTITION_EXCHANGE [$$95]  |PARTITIONED|
+                          -- ASSIGN  |PARTITIONED|
+                            -- STREAM_PROJECT  |PARTITIONED|
+                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                -- DATASOURCE_SCAN (custorder.Orders)  |PARTITIONED|
+                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                    -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/extract-common-operators/extract-common-operators.01.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/extract-common-operators/extract-common-operators.01.plan
new file mode 100644
index 0000000..d7243b5
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/extract-common-operators/extract-common-operators.01.plan
@@ -0,0 +1,90 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- SORT_MERGE_EXCHANGE [$$381(ASC), $$382(ASC) ]  |PARTITIONED|
+          -- STABLE_SORT [$$381(ASC), $$382(ASC)]  |PARTITIONED|
+            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+              -- STREAM_PROJECT  |PARTITIONED|
+                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                  -- HYBRID_HASH_JOIN [$$390][$$386]  |PARTITIONED|
+                    -- HASH_PARTITION_MERGE_EXCHANGE MERGE:[$$381(ASC), $$382(ASC)] HASH:[$$390]  |PARTITIONED|
+                      -- STABLE_SORT [$$381(ASC), $$382(ASC)]  |PARTITIONED|
+                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                          -- STREAM_PROJECT  |PARTITIONED|
+                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                              -- HYBRID_HASH_JOIN [$$390][$$384]  |PARTITIONED|
+                                -- HASH_PARTITION_EXCHANGE [$$390]  |PARTITIONED|
+                                  -- STREAM_PROJECT  |PARTITIONED|
+                                    -- ASSIGN  |PARTITIONED|
+                                      -- STREAM_PROJECT  |PARTITIONED|
+                                        -- ASSIGN  |PARTITIONED|
+                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                            -- REPLICATE  |PARTITIONED|
+                                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                -- DATASOURCE_SCAN (Metadata.Synonym)  |PARTITIONED|
+                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                    -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                -- HASH_PARTITION_EXCHANGE [$$384]  |PARTITIONED|
+                                  -- STREAM_PROJECT  |PARTITIONED|
+                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                      -- HYBRID_HASH_JOIN [$$384][$$ds_name]  |PARTITIONED|
+                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                          -- REPLICATE  |PARTITIONED|
+                                            -- HASH_PARTITION_EXCHANGE [$$384]  |PARTITIONED|
+                                              -- STREAM_PROJECT  |PARTITIONED|
+                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                  -- BTREE_SEARCH (Metadata.Dataset.Dataset)  |PARTITIONED|
+                                                    -- BROADCAST_EXCHANGE  |PARTITIONED|
+                                                      -- UNNEST  |UNPARTITIONED|
+                                                        -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
+                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                          -- REPLICATE  |PARTITIONED|
+                                            -- HASH_PARTITION_EXCHANGE [$$ds_name]  |PARTITIONED|
+                                              -- UNNEST  |UNPARTITIONED|
+                                                -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
+                    -- HASH_PARTITION_EXCHANGE [$$386]  |PARTITIONED|
+                      -- STREAM_PROJECT  |PARTITIONED|
+                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                          -- HYBRID_HASH_JOIN [$$404][$$388]  |PARTITIONED|
+                            -- HASH_PARTITION_EXCHANGE [$$404]  |PARTITIONED|
+                              -- STREAM_PROJECT  |PARTITIONED|
+                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                  -- HYBRID_HASH_JOIN [$$386][$$syn_name]  |PARTITIONED|
+                                    -- HASH_PARTITION_EXCHANGE [$$386]  |PARTITIONED|
+                                      -- STREAM_PROJECT  |PARTITIONED|
+                                        -- ASSIGN  |PARTITIONED|
+                                          -- STREAM_PROJECT  |PARTITIONED|
+                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                              -- REPLICATE  |PARTITIONED|
+                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                  -- DATASOURCE_SCAN (Metadata.Synonym)  |PARTITIONED|
+                                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                      -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                    -- HASH_PARTITION_EXCHANGE [$$syn_name]  |PARTITIONED|
+                                      -- UNNEST  |UNPARTITIONED|
+                                        -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
+                            -- HASH_PARTITION_EXCHANGE [$$388]  |PARTITIONED|
+                              -- STREAM_PROJECT  |PARTITIONED|
+                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                  -- HYBRID_HASH_JOIN [$$388][$$ds_name]  |PARTITIONED|
+                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                      -- STREAM_PROJECT  |PARTITIONED|
+                                        -- ASSIGN  |PARTITIONED|
+                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                            -- REPLICATE  |PARTITIONED|
+                                              -- HASH_PARTITION_EXCHANGE [$$384]  |PARTITIONED|
+                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                    -- BTREE_SEARCH (Metadata.Dataset.Dataset)  |PARTITIONED|
+                                                      -- BROADCAST_EXCHANGE  |PARTITIONED|
+                                                        -- UNNEST  |UNPARTITIONED|
+                                                          -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
+                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                      -- STREAM_PROJECT  |PARTITIONED|
+                                        -- ASSIGN  |PARTITIONED|
+                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                            -- REPLICATE  |PARTITIONED|
+                                              -- HASH_PARTITION_EXCHANGE [$$ds_name]  |PARTITIONED|
+                                                -- UNNEST  |UNPARTITIONED|
+                                                  -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/filter_on_meta_with_idx_2.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/filter_on_meta_with_idx_2.plan
new file mode 100644
index 0000000..e38f6f9
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/filter_on_meta_with_idx_2.plan
@@ -0,0 +1,25 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- STREAM_PROJECT  |PARTITIONED|
+          -- STREAM_SELECT  |PARTITIONED|
+            -- STREAM_PROJECT  |PARTITIONED|
+              -- STREAM_SELECT  |PARTITIONED|
+                -- STREAM_PROJECT  |PARTITIONED|
+                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                    -- BTREE_SEARCH (test.KVStore.KVStore)  |PARTITIONED|
+                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                        -- STABLE_SORT [$$39(ASC)]  |PARTITIONED|
+                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                            -- STREAM_PROJECT  |PARTITIONED|
+                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                -- BTREE_SEARCH (test.KVStore.s_location)  |PARTITIONED|
+                                  -- BROADCAST_EXCHANGE  |PARTITIONED|
+                                    -- STREAM_PROJECT  |PARTITIONED|
+                                      -- ASSIGN  |PARTITIONED|
+                                        -- STREAM_PROJECT  |PARTITIONED|
+                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                            -- DATASOURCE_SCAN (test.OfficerLocations)  |PARTITIONED|
+                                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/group-by/listify-3.1.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/group-by/listify-3.1.plan
new file mode 100644
index 0000000..ec40853
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/group-by/listify-3.1.plan
@@ -0,0 +1,43 @@
+-- DISTRIBUTE_RESULT  |LOCAL|
+  -- ONE_TO_ONE_EXCHANGE  |LOCAL|
+    -- STREAM_PROJECT  |LOCAL|
+      -- ASSIGN  |LOCAL|
+        -- AGGREGATE  |LOCAL|
+          -- AGGREGATE  |LOCAL|
+            -- STREAM_PROJECT  |LOCAL|
+              -- ASSIGN  |LOCAL|
+                -- ONE_TO_ONE_EXCHANGE  |LOCAL|
+                  -- NESTED_LOOP  |LOCAL|
+                    -- ONE_TO_ONE_EXCHANGE  |UNPARTITIONED|
+                      -- UNNEST  |UNPARTITIONED|
+                        -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
+                    -- ONE_TO_ONE_EXCHANGE  |LOCAL|
+                      -- NESTED_LOOP  |LOCAL|
+                        -- ONE_TO_ONE_EXCHANGE  |LOCAL|
+                          -- STREAM_PROJECT  |LOCAL|
+                            -- ASSIGN  |LOCAL|
+                              -- STREAM_PROJECT  |LOCAL|
+                                -- ASSIGN  |LOCAL|
+                                  -- ONE_TO_ONE_EXCHANGE  |LOCAL|
+                                    -- REPLICATE  |LOCAL|
+                                      -- ONE_TO_ONE_EXCHANGE  |LOCAL|
+                                        -- AGGREGATE  |LOCAL|
+                                          -- STREAM_PROJECT  |LOCAL|
+                                            -- ASSIGN  |LOCAL|
+                                              -- AGGREGATE  |LOCAL|
+                                                -- AGGREGATE  |LOCAL|
+                                                  -- UNNEST  |UNPARTITIONED|
+                                                    -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
+                        -- ONE_TO_ONE_EXCHANGE  |LOCAL|
+                          -- STREAM_PROJECT  |LOCAL|
+                            -- ASSIGN  |LOCAL|
+                              -- ONE_TO_ONE_EXCHANGE  |LOCAL|
+                                -- REPLICATE  |LOCAL|
+                                  -- ONE_TO_ONE_EXCHANGE  |LOCAL|
+                                    -- AGGREGATE  |LOCAL|
+                                      -- STREAM_PROJECT  |LOCAL|
+                                        -- ASSIGN  |LOCAL|
+                                          -- AGGREGATE  |LOCAL|
+                                            -- AGGREGATE  |LOCAL|
+                                              -- UNNEST  |UNPARTITIONED|
+                                                -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/joins/nlj_partitioning_property_1.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/joins/nlj_partitioning_property_1.plan
new file mode 100644
index 0000000..0585072
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/joins/nlj_partitioning_property_1.plan
@@ -0,0 +1,31 @@
+-- DISTRIBUTE_RESULT  |UNPARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |UNPARTITIONED|
+    -- STREAM_PROJECT  |UNPARTITIONED|
+      -- ASSIGN  |UNPARTITIONED|
+        -- AGGREGATE  |UNPARTITIONED|
+          -- RANDOM_MERGE_EXCHANGE  |PARTITIONED|
+            -- AGGREGATE  |PARTITIONED|
+              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                -- NESTED_LOOP  |PARTITIONED|
+                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                    -- STREAM_PROJECT  |PARTITIONED|
+                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                        -- HYBRID_HASH_JOIN [$$73][$$71]  |PARTITIONED|
+                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                            -- STREAM_PROJECT  |PARTITIONED|
+                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                -- DATASOURCE_SCAN (tpch.Partsupp)  |PARTITIONED|
+                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                    -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                          -- BROADCAST_EXCHANGE  |PARTITIONED|
+                            -- STREAM_PROJECT  |PARTITIONED|
+                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                -- DATASOURCE_SCAN (tpch.Supplier)  |PARTITIONED|
+                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                    -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                  -- BROADCAST_EXCHANGE  |PARTITIONED|
+                    -- STREAM_PROJECT  |PARTITIONED|
+                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                        -- DATASOURCE_SCAN (tpch.Part)  |PARTITIONED|
+                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                            -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/joins/nlj_partitioning_property_2.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/joins/nlj_partitioning_property_2.plan
new file mode 100644
index 0000000..4367a33
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/joins/nlj_partitioning_property_2.plan
@@ -0,0 +1,29 @@
+-- DISTRIBUTE_RESULT  |UNPARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |UNPARTITIONED|
+    -- STREAM_PROJECT  |UNPARTITIONED|
+      -- ASSIGN  |UNPARTITIONED|
+        -- AGGREGATE  |UNPARTITIONED|
+          -- RANDOM_MERGE_EXCHANGE  |PARTITIONED|
+            -- AGGREGATE  |PARTITIONED|
+              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                -- NESTED_LOOP  |PARTITIONED|
+                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                    -- NESTED_LOOP  |PARTITIONED|
+                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                        -- STREAM_PROJECT  |PARTITIONED|
+                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                            -- DATASOURCE_SCAN (tpch.Partsupp)  |PARTITIONED|
+                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                      -- BROADCAST_EXCHANGE  |PARTITIONED|
+                        -- STREAM_PROJECT  |PARTITIONED|
+                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                            -- DATASOURCE_SCAN (tpch.Part)  |PARTITIONED|
+                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                  -- BROADCAST_EXCHANGE  |PARTITIONED|
+                    -- STREAM_PROJECT  |PARTITIONED|
+                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                        -- DATASOURCE_SCAN (tpch.Supplier)  |PARTITIONED|
+                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                            -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/leftouterjoin/query-ASTERIXDB-2857.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/leftouterjoin/query-ASTERIXDB-2857.plan
new file mode 100644
index 0000000..6ecdc2b
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/leftouterjoin/query-ASTERIXDB-2857.plan
@@ -0,0 +1,32 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- SORT_MERGE_EXCHANGE [$$136(ASC), $$137(ASC), $#3(ASC) ]  |PARTITIONED|
+          -- STABLE_SORT [$$136(ASC), $$137(ASC), $#3(ASC)]  |PARTITIONED|
+            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+              -- STREAM_PROJECT  |PARTITIONED|
+                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                  -- NESTED_LOOP  |PARTITIONED|
+                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                      -- STREAM_PROJECT  |PARTITIONED|
+                        -- ASSIGN  |PARTITIONED|
+                          -- STREAM_SELECT  |PARTITIONED|
+                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                              -- BTREE_SEARCH (test.tenk.tenk)  |PARTITIONED|
+                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                  -- STREAM_PROJECT  |PARTITIONED|
+                                    -- ASSIGN  |PARTITIONED|
+                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                        -- BTREE_SEARCH (test.tenk.tenk)  |PARTITIONED|
+                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                            -- ASSIGN  |PARTITIONED|
+                                              -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                    -- BROADCAST_EXCHANGE  |PARTITIONED|
+                      -- STREAM_PROJECT  |PARTITIONED|
+                        -- ASSIGN  |PARTITIONED|
+                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                            -- BTREE_SEARCH (test.tenk.tenk)  |PARTITIONED|
+                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                -- ASSIGN  |PARTITIONED|
+                                  -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/meta/indexes_on_dataset_with_meta_05.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/meta/indexes_on_dataset_with_meta_05.plan
new file mode 100644
index 0000000..6013ad8
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/meta/indexes_on_dataset_with_meta_05.plan
@@ -0,0 +1,18 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- STREAM_PROJECT  |PARTITIONED|
+          -- SORT_MERGE_EXCHANGE [$$29(ASC) ]  |PARTITIONED|
+            -- STREAM_PROJECT  |PARTITIONED|
+              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                -- BTREE_SEARCH (test.DS2.DS2)  |PARTITIONED|
+                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                    -- STABLE_SORT [$$34(ASC)]  |PARTITIONED|
+                      -- HASH_PARTITION_EXCHANGE [$$34]  |PARTITIONED|
+                        -- ASSIGN  |PARTITIONED|
+                          -- STREAM_PROJECT  |PARTITIONED|
+                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                              -- DATASOURCE_SCAN (test.DS1)  |PARTITIONED|
+                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                  -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/nested-index/btree-index-join/ASTERIXDB-2199.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/nested-index/btree-index-join/ASTERIXDB-2199.plan
new file mode 100644
index 0000000..c091a3b
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/nested-index/btree-index-join/ASTERIXDB-2199.plan
@@ -0,0 +1,11 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- STREAM_PROJECT  |PARTITIONED|
+          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+            -- BTREE_SEARCH (Facebook.Friendship.Friendship)  |PARTITIONED|
+              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                -- DATASOURCE_SCAN (Facebook.Friendship)  |PARTITIONED|
+                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                    -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/nested-open-index/btree-index-join/non-enforced-composite-key-equi-join/05.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/nested-open-index/btree-index-join/non-enforced-composite-key-equi-join/05.plan
new file mode 100644
index 0000000..4eb7b4f
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/nested-open-index/btree-index-join/non-enforced-composite-key-equi-join/05.plan
@@ -0,0 +1,31 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- SORT_MERGE_EXCHANGE [$$46(ASC), $$47(ASC) ]  |PARTITIONED|
+          -- STABLE_SORT [$$46(ASC), $$47(ASC)]  |PARTITIONED|
+            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+              -- STREAM_PROJECT  |PARTITIONED|
+                -- STREAM_SELECT  |PARTITIONED|
+                  -- ASSIGN  |PARTITIONED|
+                    -- STREAM_PROJECT  |PARTITIONED|
+                      -- ASSIGN  |PARTITIONED|
+                        -- STREAM_PROJECT  |PARTITIONED|
+                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                            -- BTREE_SEARCH (test.TestOpen2.TestOpen2)  |PARTITIONED|
+                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                -- STABLE_SORT [$$54(ASC)]  |PARTITIONED|
+                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                    -- STREAM_PROJECT  |PARTITIONED|
+                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                        -- BTREE_SEARCH (test.TestOpen2.idx_t2_s)  |PARTITIONED|
+                                          -- BROADCAST_EXCHANGE  |PARTITIONED|
+                                            -- STREAM_PROJECT  |PARTITIONED|
+                                              -- ASSIGN  |PARTITIONED|
+                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                  -- ASSIGN  |PARTITIONED|
+                                                    -- STREAM_PROJECT  |PARTITIONED|
+                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                        -- DATASOURCE_SCAN (test.TestOpen1)  |PARTITIONED|
+                                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                            -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/open-index-non-enforced/btree-equi-join-non-enforced/btree-equi-join-non-enforced-07.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/open-index-non-enforced/btree-equi-join-non-enforced/btree-equi-join-non-enforced-07.plan
new file mode 100644
index 0000000..e2f07be
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/open-index-non-enforced/btree-equi-join-non-enforced/btree-equi-join-non-enforced-07.plan
@@ -0,0 +1,27 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- SORT_MERGE_EXCHANGE [$$38(ASC), $$39(ASC) ]  |PARTITIONED|
+          -- STABLE_SORT [$$38(ASC), $$39(ASC)]  |PARTITIONED|
+            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+              -- STREAM_PROJECT  |PARTITIONED|
+                -- STREAM_SELECT  |PARTITIONED|
+                  -- ASSIGN  |PARTITIONED|
+                    -- STREAM_PROJECT  |PARTITIONED|
+                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                        -- BTREE_SEARCH (test.TestOpen2.TestOpen2)  |PARTITIONED|
+                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                            -- STABLE_SORT [$$43(ASC)]  |PARTITIONED|
+                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                -- STREAM_PROJECT  |PARTITIONED|
+                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                    -- BTREE_SEARCH (test.TestOpen2.idx_t2_s)  |PARTITIONED|
+                                      -- BROADCAST_EXCHANGE  |PARTITIONED|
+                                        -- STREAM_PROJECT  |PARTITIONED|
+                                          -- ASSIGN  |PARTITIONED|
+                                            -- STREAM_PROJECT  |PARTITIONED|
+                                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                -- DATASOURCE_SCAN (test.TestOpen1)  |PARTITIONED|
+                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                    -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/open-index-non-enforced/btree-equi-join-non-enforced/btree-equi-join-non-enforced-07_ps.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/open-index-non-enforced/btree-equi-join-non-enforced/btree-equi-join-non-enforced-07_ps.plan
new file mode 100644
index 0000000..af04b9c
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/open-index-non-enforced/btree-equi-join-non-enforced/btree-equi-join-non-enforced-07_ps.plan
@@ -0,0 +1,58 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+          -- STABLE_SORT [$$38(ASC), $$39(ASC)]  |PARTITIONED|
+            -- RANGE_PARTITION_EXCHANGE [$$38(ASC), $$39(ASC)]  |PARTITIONED|
+              -- FORWARD  |PARTITIONED|
+                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                  -- REPLICATE  |PARTITIONED|
+                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                      -- STREAM_PROJECT  |PARTITIONED|
+                        -- STREAM_SELECT  |PARTITIONED|
+                          -- ASSIGN  |PARTITIONED|
+                            -- STREAM_PROJECT  |PARTITIONED|
+                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                -- BTREE_SEARCH (test.TestOpen2.TestOpen2)  |PARTITIONED|
+                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                    -- STABLE_SORT [$$43(ASC)]  |PARTITIONED|
+                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                        -- STREAM_PROJECT  |PARTITIONED|
+                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                            -- BTREE_SEARCH (test.TestOpen2.idx_t2_s)  |PARTITIONED|
+                                              -- BROADCAST_EXCHANGE  |PARTITIONED|
+                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                  -- ASSIGN  |PARTITIONED|
+                                                    -- STREAM_PROJECT  |PARTITIONED|
+                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                        -- DATASOURCE_SCAN (test.TestOpen1)  |PARTITIONED|
+                                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                            -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                -- BROADCAST_EXCHANGE  |PARTITIONED|
+                  -- AGGREGATE  |UNPARTITIONED|
+                    -- RANDOM_MERGE_EXCHANGE  |PARTITIONED|
+                      -- AGGREGATE  |PARTITIONED|
+                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                          -- REPLICATE  |PARTITIONED|
+                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                              -- STREAM_PROJECT  |PARTITIONED|
+                                -- STREAM_SELECT  |PARTITIONED|
+                                  -- ASSIGN  |PARTITIONED|
+                                    -- STREAM_PROJECT  |PARTITIONED|
+                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                        -- BTREE_SEARCH (test.TestOpen2.TestOpen2)  |PARTITIONED|
+                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                            -- STABLE_SORT [$$43(ASC)]  |PARTITIONED|
+                                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                    -- BTREE_SEARCH (test.TestOpen2.idx_t2_s)  |PARTITIONED|
+                                                      -- BROADCAST_EXCHANGE  |PARTITIONED|
+                                                        -- STREAM_PROJECT  |PARTITIONED|
+                                                          -- ASSIGN  |PARTITIONED|
+                                                            -- STREAM_PROJECT  |PARTITIONED|
+                                                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                -- DATASOURCE_SCAN (test.TestOpen1)  |PARTITIONED|
+                                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                    -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/q08_group_by.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/q08_group_by.plan
new file mode 100644
index 0000000..fbaefe2
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/q08_group_by.plan
@@ -0,0 +1,55 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- STREAM_PROJECT  |PARTITIONED|
+          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+            -- BTREE_SEARCH (q08_group_by.Supplier.Supplier)  |PARTITIONED|
+              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                -- STABLE_SORT [$$221(ASC)]  |PARTITIONED|
+                  -- HASH_PARTITION_EXCHANGE [$$221]  |PARTITIONED|
+                    -- STREAM_PROJECT  |PARTITIONED|
+                      -- STREAM_SELECT  |PARTITIONED|
+                        -- STREAM_PROJECT  |PARTITIONED|
+                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                            -- BTREE_SEARCH (q08_group_by.Part.Part)  |PARTITIONED|
+                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                -- STABLE_SORT [$$218(ASC)]  |PARTITIONED|
+                                  -- HASH_PARTITION_EXCHANGE [$$218]  |PARTITIONED|
+                                    -- STREAM_PROJECT  |PARTITIONED|
+                                      -- ASSIGN  |PARTITIONED|
+                                        -- STREAM_PROJECT  |PARTITIONED|
+                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                            -- BTREE_SEARCH (q08_group_by.LineItem.LineItem)  |PARTITIONED|
+                                              -- BROADCAST_EXCHANGE  |PARTITIONED|
+                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                  -- STREAM_SELECT  |PARTITIONED|
+                                                    -- STREAM_PROJECT  |PARTITIONED|
+                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                        -- BTREE_SEARCH (q08_group_by.Region.Region)  |PARTITIONED|
+                                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                            -- STABLE_SORT [$$204(ASC)]  |PARTITIONED|
+                                                              -- HASH_PARTITION_EXCHANGE [$$204]  |PARTITIONED|
+                                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                                  -- ASSIGN  |PARTITIONED|
+                                                                    -- STREAM_PROJECT  |PARTITIONED|
+                                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                        -- BTREE_SEARCH (q08_group_by.Nation.Nation)  |PARTITIONED|
+                                                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                            -- STABLE_SORT [$$206(ASC)]  |PARTITIONED|
+                                                                              -- HASH_PARTITION_EXCHANGE [$$206]  |PARTITIONED|
+                                                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                                                  -- ASSIGN  |PARTITIONED|
+                                                                                    -- STREAM_PROJECT  |PARTITIONED|
+                                                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                        -- BTREE_SEARCH (q08_group_by.Customer.Customer)  |PARTITIONED|
+                                                                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                            -- STABLE_SORT [$$209(ASC)]  |PARTITIONED|
+                                                                                              -- HASH_PARTITION_EXCHANGE [$$209]  |PARTITIONED|
+                                                                                                -- STREAM_SELECT  |PARTITIONED|
+                                                                                                  -- STREAM_PROJECT  |PARTITIONED|
+                                                                                                    -- ASSIGN  |PARTITIONED|
+                                                                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                                        -- DATASOURCE_SCAN (q08_group_by.Orders)  |PARTITIONED|
+                                                                                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                                            -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/q09_group_by.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/q09_group_by.plan
new file mode 100644
index 0000000..9a390a3
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/q09_group_by.plan
@@ -0,0 +1,46 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- STREAM_PROJECT  |PARTITIONED|
+          -- STREAM_SELECT  |PARTITIONED|
+            -- STREAM_PROJECT  |PARTITIONED|
+              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                -- BTREE_SEARCH (q09_group_by.Part.Part)  |PARTITIONED|
+                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                    -- STABLE_SORT [$$161(ASC)]  |PARTITIONED|
+                      -- HASH_PARTITION_EXCHANGE [$$161]  |PARTITIONED|
+                        -- STREAM_PROJECT  |PARTITIONED|
+                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                            -- HYBRID_HASH_JOIN [$$161, $$146][$$140, $$141]  |PARTITIONED|
+                              -- HASH_PARTITION_EXCHANGE [$$161, $$146]  |PARTITIONED|
+                                -- STREAM_PROJECT  |PARTITIONED|
+                                  -- ASSIGN  |PARTITIONED|
+                                    -- STREAM_PROJECT  |PARTITIONED|
+                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                        -- BTREE_SEARCH (q09_group_by.Nation.Nation)  |PARTITIONED|
+                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                            -- STABLE_SORT [$$149(ASC)]  |PARTITIONED|
+                                              -- HASH_PARTITION_EXCHANGE [$$149]  |PARTITIONED|
+                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                  -- ASSIGN  |PARTITIONED|
+                                                    -- STREAM_PROJECT  |PARTITIONED|
+                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                        -- BTREE_SEARCH (q09_group_by.Supplier.Supplier)  |PARTITIONED|
+                                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                            -- STABLE_SORT [$$146(ASC)]  |PARTITIONED|
+                                                              -- HASH_PARTITION_EXCHANGE [$$146]  |PARTITIONED|
+                                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                                  -- ASSIGN  |PARTITIONED|
+                                                                    -- STREAM_PROJECT  |PARTITIONED|
+                                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                        -- DATASOURCE_SCAN (q09_group_by.LineItem)  |PARTITIONED|
+                                                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                            -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                -- STREAM_PROJECT  |PARTITIONED|
+                                  -- ASSIGN  |PARTITIONED|
+                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                      -- DATASOURCE_SCAN (q09_group_by.Partsupp)  |PARTITIONED|
+                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                          -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/query_issue849.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/query_issue849.plan
new file mode 100644
index 0000000..0f1879f
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/query_issue849.plan
@@ -0,0 +1,29 @@
+-- COMMIT  |PARTITIONED|
+  -- STREAM_PROJECT  |PARTITIONED|
+    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+      -- INSERT_DELETE  |PARTITIONED|
+        -- HASH_PARTITION_EXCHANGE [$$3]  |PARTITIONED|
+          -- ASSIGN  |UNPARTITIONED|
+            -- ASSIGN  |UNPARTITIONED|
+              -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
+-- COMMIT  |PARTITIONED|
+  -- STREAM_PROJECT  |PARTITIONED|
+    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+      -- INSERT_DELETE  |PARTITIONED|
+        -- HASH_PARTITION_EXCHANGE [$$3]  |PARTITIONED|
+          -- ASSIGN  |UNPARTITIONED|
+            -- ASSIGN  |UNPARTITIONED|
+              -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- STREAM_PROJECT  |PARTITIONED|
+          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+            -- BTREE_SEARCH (test.s.s)  |PARTITIONED|
+              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                -- STABLE_SORT [$$52(ASC)]  |PARTITIONED|
+                  -- HASH_PARTITION_EXCHANGE [$$52]  |PARTITIONED|
+                    -- ASSIGN  |UNPARTITIONED|
+                      -- UNNEST  |UNPARTITIONED|
+                        -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/split-materialization.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/split-materialization.plan
new file mode 100644
index 0000000..34f5238
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/split-materialization.plan
@@ -0,0 +1,20 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- SORT_MERGE_EXCHANGE [$$91(ASC), $$92(ASC) ]  |PARTITIONED|
+          -- STABLE_SORT [$$91(ASC), $$92(ASC)]  |PARTITIONED|
+            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+              -- STREAM_PROJECT  |PARTITIONED|
+                -- STREAM_SELECT  |PARTITIONED|
+                  -- ASSIGN  |PARTITIONED|
+                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                      -- BTREE_SEARCH (TinySocial.FacebookUsers.FacebookUsers)  |PARTITIONED|
+                        -- BROADCAST_EXCHANGE  |PARTITIONED|
+                          -- STREAM_PROJECT  |PARTITIONED|
+                            -- STREAM_SELECT  |PARTITIONED|
+                              -- ASSIGN  |PARTITIONED|
+                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                  -- DATASOURCE_SCAN (TinySocial.FacebookUsers)  |PARTITIONED|
+                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                      -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/split-materialization_ps.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/split-materialization_ps.plan
new file mode 100644
index 0000000..2881c66
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/split-materialization_ps.plan
@@ -0,0 +1,45 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+          -- STABLE_SORT [$$91(ASC), $$92(ASC)]  |PARTITIONED|
+            -- RANGE_PARTITION_EXCHANGE [$$91(ASC), $$92(ASC)]  |PARTITIONED|
+              -- FORWARD  |PARTITIONED|
+                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                  -- REPLICATE  |PARTITIONED|
+                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                      -- STREAM_PROJECT  |PARTITIONED|
+                        -- STREAM_SELECT  |PARTITIONED|
+                          -- ASSIGN  |PARTITIONED|
+                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                              -- BTREE_SEARCH (TinySocial.FacebookUsers.FacebookUsers)  |PARTITIONED|
+                                -- BROADCAST_EXCHANGE  |PARTITIONED|
+                                  -- STREAM_PROJECT  |PARTITIONED|
+                                    -- STREAM_SELECT  |PARTITIONED|
+                                      -- ASSIGN  |PARTITIONED|
+                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                          -- DATASOURCE_SCAN (TinySocial.FacebookUsers)  |PARTITIONED|
+                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                              -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                -- BROADCAST_EXCHANGE  |PARTITIONED|
+                  -- AGGREGATE  |UNPARTITIONED|
+                    -- RANDOM_MERGE_EXCHANGE  |PARTITIONED|
+                      -- AGGREGATE  |PARTITIONED|
+                        -- STREAM_PROJECT  |PARTITIONED|
+                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                            -- REPLICATE  |PARTITIONED|
+                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                -- STREAM_PROJECT  |PARTITIONED|
+                                  -- STREAM_SELECT  |PARTITIONED|
+                                    -- ASSIGN  |PARTITIONED|
+                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                        -- BTREE_SEARCH (TinySocial.FacebookUsers.FacebookUsers)  |PARTITIONED|
+                                          -- BROADCAST_EXCHANGE  |PARTITIONED|
+                                            -- STREAM_PROJECT  |PARTITIONED|
+                                              -- STREAM_SELECT  |PARTITIONED|
+                                                -- ASSIGN  |PARTITIONED|
+                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                    -- DATASOURCE_SCAN (TinySocial.FacebookUsers)  |PARTITIONED|
+                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                        -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/tpcds/query-ASTERIXDB-1580.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/tpcds/query-ASTERIXDB-1580.plan
new file mode 100644
index 0000000..111de48
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/tpcds/query-ASTERIXDB-1580.plan
@@ -0,0 +1,59 @@
+-- DISTRIBUTE_RESULT  |UNPARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |UNPARTITIONED|
+    -- STREAM_LIMIT  |UNPARTITIONED|
+      -- STREAM_PROJECT  |PARTITIONED|
+        -- ASSIGN  |PARTITIONED|
+          -- SORT_MERGE_EXCHANGE [$$128(ASC) ]  |PARTITIONED|
+            -- STREAM_LIMIT  |PARTITIONED|
+              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                -- STABLE_SORT [topK: 100] [$$128(ASC)]  |PARTITIONED|
+                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                    -- STREAM_PROJECT  |PARTITIONED|
+                      -- STREAM_SELECT  |PARTITIONED|
+                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                          -- SORT_GROUP_BY[$$137]  |PARTITIONED|
+                                  {
+                                    -- AGGREGATE  |LOCAL|
+                                      -- NESTED_TUPLE_SOURCE  |LOCAL|
+                                  }
+                            -- HASH_PARTITION_EXCHANGE [$$137]  |PARTITIONED|
+                              -- SORT_GROUP_BY[$$118]  |PARTITIONED|
+                                      {
+                                        -- AGGREGATE  |LOCAL|
+                                          -- NESTED_TUPLE_SOURCE  |LOCAL|
+                                      }
+                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                  -- STREAM_PROJECT  |PARTITIONED|
+                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                      -- BTREE_SEARCH (tpcds.item.item)  |PARTITIONED|
+                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                          -- STABLE_SORT [$$121(ASC)]  |PARTITIONED|
+                                            -- HASH_PARTITION_EXCHANGE [$$121]  |PARTITIONED|
+                                              -- STREAM_PROJECT  |PARTITIONED|
+                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                  -- BTREE_SEARCH (tpcds.date_dim.date_dim)  |PARTITIONED|
+                                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                      -- STABLE_SORT [$$129(ASC)]  |PARTITIONED|
+                                                        -- HASH_PARTITION_EXCHANGE [$$129]  |PARTITIONED|
+                                                          -- ASSIGN  |PARTITIONED|
+                                                            -- STREAM_PROJECT  |PARTITIONED|
+                                                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                -- BTREE_SEARCH (tpcds.customer_address.customer_address)  |PARTITIONED|
+                                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                    -- STABLE_SORT [$$132(ASC)]  |PARTITIONED|
+                                                                      -- HASH_PARTITION_EXCHANGE [$$132]  |PARTITIONED|
+                                                                        -- STREAM_PROJECT  |PARTITIONED|
+                                                                          -- ASSIGN  |PARTITIONED|
+                                                                            -- STREAM_PROJECT  |PARTITIONED|
+                                                                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                -- BTREE_SEARCH (tpcds.customer.customer)  |PARTITIONED|
+                                                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                    -- STABLE_SORT [$$134(ASC)]  |PARTITIONED|
+                                                                                      -- HASH_PARTITION_EXCHANGE [$$134]  |PARTITIONED|
+                                                                                        -- STREAM_PROJECT  |PARTITIONED|
+                                                                                          -- ASSIGN  |PARTITIONED|
+                                                                                            -- STREAM_PROJECT  |PARTITIONED|
+                                                                                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                                -- DATASOURCE_SCAN (tpcds.store_sales)  |PARTITIONED|
+                                                                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                                    -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/tpcds/query-ASTERIXDB-1591.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/tpcds/query-ASTERIXDB-1591.plan
new file mode 100644
index 0000000..95b99e4
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/tpcds/query-ASTERIXDB-1591.plan
@@ -0,0 +1,128 @@
+-- DISTRIBUTE_RESULT  |UNPARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |UNPARTITIONED|
+    -- STREAM_LIMIT  |UNPARTITIONED|
+      -- STREAM_PROJECT  |PARTITIONED|
+        -- ASSIGN  |PARTITIONED|
+          -- STREAM_PROJECT  |PARTITIONED|
+            -- SORT_MERGE_EXCHANGE [$$184(ASC) ]  |PARTITIONED|
+              -- STREAM_LIMIT  |PARTITIONED|
+                -- STREAM_PROJECT  |PARTITIONED|
+                  -- STREAM_SELECT  |PARTITIONED|
+                    -- STREAM_PROJECT  |PARTITIONED|
+                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                        -- SORT_GROUP_BY[$$193, $$194]  |PARTITIONED|
+                                {
+                                  -- AGGREGATE  |LOCAL|
+                                    -- NESTED_TUPLE_SOURCE  |LOCAL|
+                                }
+                          -- HASH_PARTITION_EXCHANGE [$$193, $$194]  |PARTITIONED|
+                            -- PRE_CLUSTERED_GROUP_BY[$$181, $$182]  |PARTITIONED|
+                                    {
+                                      -- AGGREGATE  |LOCAL|
+                                        -- STREAM_SELECT  |LOCAL|
+                                          -- NESTED_TUPLE_SOURCE  |LOCAL|
+                                    }
+                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                -- STABLE_SORT [$$181(ASC), $$182(ASC)]  |PARTITIONED|
+                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                    -- STREAM_PROJECT  |PARTITIONED|
+                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                        -- HYBRID_HASH_JOIN [$$181][$$163]  |PARTITIONED|
+                                          -- HASH_PARTITION_EXCHANGE [$$181]  |PARTITIONED|
+                                            -- SORT_GROUP_BY[$$190, $$191]  |PARTITIONED|
+                                                    {
+                                                      -- AGGREGATE  |LOCAL|
+                                                        -- NESTED_TUPLE_SOURCE  |LOCAL|
+                                                    }
+                                              -- HASH_PARTITION_EXCHANGE [$$190, $$191]  |PARTITIONED|
+                                                -- PRE_CLUSTERED_GROUP_BY[$$178, $$179]  |PARTITIONED|
+                                                        {
+                                                          -- AGGREGATE  |LOCAL|
+                                                            -- STREAM_SELECT  |LOCAL|
+                                                              -- NESTED_TUPLE_SOURCE  |LOCAL|
+                                                        }
+                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                    -- STABLE_SORT [$$178(ASC), $$179(ASC)]  |PARTITIONED|
+                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                        -- STREAM_PROJECT  |PARTITIONED|
+                                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                            -- HYBRID_HASH_JOIN [$$178][$$161]  |PARTITIONED|
+                                                              -- HASH_PARTITION_EXCHANGE [$$178]  |PARTITIONED|
+                                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                                  -- STREAM_SELECT  |PARTITIONED|
+                                                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                      -- SORT_GROUP_BY[$$187, $$188]  |PARTITIONED|
+                                                                              {
+                                                                                -- AGGREGATE  |LOCAL|
+                                                                                  -- NESTED_TUPLE_SOURCE  |LOCAL|
+                                                                              }
+                                                                        -- HASH_PARTITION_EXCHANGE [$$187, $$188]  |PARTITIONED|
+                                                                          -- PRE_CLUSTERED_GROUP_BY[$$142, $$143]  |PARTITIONED|
+                                                                                  {
+                                                                                    -- AGGREGATE  |LOCAL|
+                                                                                      -- STREAM_SELECT  |LOCAL|
+                                                                                        -- NESTED_TUPLE_SOURCE  |LOCAL|
+                                                                                  }
+                                                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                              -- STABLE_SORT [$$142(ASC), $$143(ASC)]  |PARTITIONED|
+                                                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                  -- STREAM_PROJECT  |PARTITIONED|
+                                                                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                      -- HYBRID_HASH_JOIN [$$142][$$159]  |PARTITIONED|
+                                                                                        -- HASH_PARTITION_EXCHANGE [$$142]  |PARTITIONED|
+                                                                                          -- STREAM_PROJECT  |PARTITIONED|
+                                                                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                              -- BTREE_SEARCH (tpcds.customer_address.customer_address)  |PARTITIONED|
+                                                                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                                  -- STABLE_SORT [$$153(ASC)]  |PARTITIONED|
+                                                                                                    -- HASH_PARTITION_EXCHANGE [$$153]  |PARTITIONED|
+                                                                                                      -- ASSIGN  |PARTITIONED|
+                                                                                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                                          -- DATASOURCE_SCAN (tpcds.customer)  |PARTITIONED|
+                                                                                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                                              -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                                                                        -- HASH_PARTITION_EXCHANGE [$$159]  |PARTITIONED|
+                                                                                          -- ASSIGN  |PARTITIONED|
+                                                                                            -- STREAM_SELECT  |PARTITIONED|
+                                                                                              -- STREAM_PROJECT  |PARTITIONED|
+                                                                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                                  -- BTREE_SEARCH (tpcds.date_dim.date_dim)  |PARTITIONED|
+                                                                                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                                      -- STABLE_SORT [$$164(ASC)]  |PARTITIONED|
+                                                                                                        -- HASH_PARTITION_EXCHANGE [$$164]  |PARTITIONED|
+                                                                                                          -- ASSIGN  |PARTITIONED|
+                                                                                                            -- STREAM_PROJECT  |PARTITIONED|
+                                                                                                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                                                -- DATASOURCE_SCAN (tpcds.store_sales)  |PARTITIONED|
+                                                                                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                                                    -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                                              -- HASH_PARTITION_EXCHANGE [$$161]  |PARTITIONED|
+                                                                -- ASSIGN  |PARTITIONED|
+                                                                  -- STREAM_SELECT  |PARTITIONED|
+                                                                    -- STREAM_PROJECT  |PARTITIONED|
+                                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                        -- BTREE_SEARCH (tpcds.date_dim.date_dim)  |PARTITIONED|
+                                                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                            -- STABLE_SORT [$$166(ASC)]  |PARTITIONED|
+                                                                              -- HASH_PARTITION_EXCHANGE [$$166]  |PARTITIONED|
+                                                                                -- ASSIGN  |PARTITIONED|
+                                                                                  -- STREAM_PROJECT  |PARTITIONED|
+                                                                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                      -- DATASOURCE_SCAN (tpcds.web_sales)  |PARTITIONED|
+                                                                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                                          -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                          -- HASH_PARTITION_EXCHANGE [$$163]  |PARTITIONED|
+                                            -- ASSIGN  |PARTITIONED|
+                                              -- STREAM_SELECT  |PARTITIONED|
+                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                    -- BTREE_SEARCH (tpcds.date_dim.date_dim)  |PARTITIONED|
+                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                        -- STABLE_SORT [$$168(ASC)]  |PARTITIONED|
+                                                          -- HASH_PARTITION_EXCHANGE [$$168]  |PARTITIONED|
+                                                            -- ASSIGN  |PARTITIONED|
+                                                              -- STREAM_PROJECT  |PARTITIONED|
+                                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                  -- DATASOURCE_SCAN (tpcds.catalog_sales)  |PARTITIONED|
+                                                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                      -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/tpch/q12_shipping.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/tpch/q12_shipping.plan
new file mode 100644
index 0000000..7a08146
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/tpch/q12_shipping.plan
@@ -0,0 +1,43 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- SORT_MERGE_EXCHANGE [$$l_shipmode(ASC) ]  |PARTITIONED|
+          -- SORT_GROUP_BY[$$131]  |PARTITIONED|
+                  {
+                    -- AGGREGATE  |LOCAL|
+                      -- NESTED_TUPLE_SOURCE  |LOCAL|
+                  }
+            -- HASH_PARTITION_EXCHANGE [$$131]  |PARTITIONED|
+              -- SORT_GROUP_BY[$$114]  |PARTITIONED|
+                      {
+                        -- AGGREGATE  |LOCAL|
+                          -- NESTED_TUPLE_SOURCE  |LOCAL|
+                      }
+                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                  -- STREAM_PROJECT  |PARTITIONED|
+                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                      -- HYBRID_HASH_JOIN [$$120][$$114]  |PARTITIONED|
+                        -- RANDOM_PARTITION_EXCHANGE  |PARTITIONED|
+                          -- UNNEST  |UNPARTITIONED|
+                            -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
+                        -- BROADCAST_EXCHANGE  |PARTITIONED|
+                          -- STREAM_PROJECT  |PARTITIONED|
+                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                              -- HYBRID_HASH_JOIN [$$122][$$118]  |PARTITIONED|
+                                -- HASH_PARTITION_EXCHANGE [$$122]  |PARTITIONED|
+                                  -- STREAM_PROJECT  |PARTITIONED|
+                                    -- STREAM_SELECT  |PARTITIONED|
+                                      -- ASSIGN  |PARTITIONED|
+                                        -- STREAM_PROJECT  |PARTITIONED|
+                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                            -- DATASOURCE_SCAN (tpch.LineItem)  |PARTITIONED|
+                                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                  -- STREAM_PROJECT  |PARTITIONED|
+                                    -- ASSIGN  |PARTITIONED|
+                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                        -- DATASOURCE_SCAN (tpch.Orders)  |PARTITIONED|
+                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                            -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/tpch/q12_shipping_broadcast.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/tpch/q12_shipping_broadcast.plan
new file mode 100644
index 0000000..613c7cc
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/tpch/q12_shipping_broadcast.plan
@@ -0,0 +1,43 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- SORT_MERGE_EXCHANGE [$$l_shipmode(ASC) ]  |PARTITIONED|
+          -- SORT_GROUP_BY[$$131]  |PARTITIONED|
+                  {
+                    -- AGGREGATE  |LOCAL|
+                      -- NESTED_TUPLE_SOURCE  |LOCAL|
+                  }
+            -- HASH_PARTITION_EXCHANGE [$$131]  |PARTITIONED|
+              -- SORT_GROUP_BY[$$114]  |PARTITIONED|
+                      {
+                        -- AGGREGATE  |LOCAL|
+                          -- NESTED_TUPLE_SOURCE  |LOCAL|
+                      }
+                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                  -- STREAM_PROJECT  |PARTITIONED|
+                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                      -- HYBRID_HASH_JOIN [$$120][$$114]  |PARTITIONED|
+                        -- RANDOM_PARTITION_EXCHANGE  |PARTITIONED|
+                          -- UNNEST  |UNPARTITIONED|
+                            -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
+                        -- BROADCAST_EXCHANGE  |PARTITIONED|
+                          -- STREAM_PROJECT  |PARTITIONED|
+                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                              -- HYBRID_HASH_JOIN [$$121][$$118]  |PARTITIONED|
+                                -- HASH_PARTITION_EXCHANGE [$$121]  |PARTITIONED|
+                                  -- STREAM_PROJECT  |PARTITIONED|
+                                    -- STREAM_SELECT  |PARTITIONED|
+                                      -- ASSIGN  |PARTITIONED|
+                                        -- STREAM_PROJECT  |PARTITIONED|
+                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                            -- DATASOURCE_SCAN (tpch.LineItem)  |PARTITIONED|
+                                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                  -- STREAM_PROJECT  |PARTITIONED|
+                                    -- ASSIGN  |PARTITIONED|
+                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                        -- DATASOURCE_SCAN (tpch.Orders)  |PARTITIONED|
+                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                            -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/tpch/q12_shipping_broadcast_ps.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/tpch/q12_shipping_broadcast_ps.plan
new file mode 100644
index 0000000..7fce16c
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/tpch/q12_shipping_broadcast_ps.plan
@@ -0,0 +1,95 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+          -- STABLE_SORT [$$l_shipmode(ASC)]  |PARTITIONED|
+            -- RANGE_PARTITION_EXCHANGE [$$l_shipmode(ASC)]  |PARTITIONED|
+              -- FORWARD  |PARTITIONED|
+                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                  -- REPLICATE  |PARTITIONED|
+                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                      -- SORT_GROUP_BY[$$131]  |PARTITIONED|
+                              {
+                                -- AGGREGATE  |LOCAL|
+                                  -- NESTED_TUPLE_SOURCE  |LOCAL|
+                              }
+                        -- HASH_PARTITION_EXCHANGE [$$131]  |PARTITIONED|
+                          -- SORT_GROUP_BY[$$114]  |PARTITIONED|
+                                  {
+                                    -- AGGREGATE  |LOCAL|
+                                      -- NESTED_TUPLE_SOURCE  |LOCAL|
+                                  }
+                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                              -- STREAM_PROJECT  |PARTITIONED|
+                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                  -- HYBRID_HASH_JOIN [$$120][$$114]  |PARTITIONED|
+                                    -- RANDOM_PARTITION_EXCHANGE  |PARTITIONED|
+                                      -- UNNEST  |UNPARTITIONED|
+                                        -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
+                                    -- BROADCAST_EXCHANGE  |PARTITIONED|
+                                      -- STREAM_PROJECT  |PARTITIONED|
+                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                          -- HYBRID_HASH_JOIN [$$121][$$118]  |PARTITIONED|
+                                            -- HASH_PARTITION_EXCHANGE [$$121]  |PARTITIONED|
+                                              -- STREAM_PROJECT  |PARTITIONED|
+                                                -- STREAM_SELECT  |PARTITIONED|
+                                                  -- ASSIGN  |PARTITIONED|
+                                                    -- STREAM_PROJECT  |PARTITIONED|
+                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                        -- DATASOURCE_SCAN (tpch.LineItem)  |PARTITIONED|
+                                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                            -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                              -- STREAM_PROJECT  |PARTITIONED|
+                                                -- ASSIGN  |PARTITIONED|
+                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                    -- DATASOURCE_SCAN (tpch.Orders)  |PARTITIONED|
+                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                        -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                -- BROADCAST_EXCHANGE  |PARTITIONED|
+                  -- AGGREGATE  |UNPARTITIONED|
+                    -- RANDOM_MERGE_EXCHANGE  |PARTITIONED|
+                      -- AGGREGATE  |PARTITIONED|
+                        -- STREAM_PROJECT  |PARTITIONED|
+                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                            -- REPLICATE  |PARTITIONED|
+                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                -- SORT_GROUP_BY[$$131]  |PARTITIONED|
+                                        {
+                                          -- AGGREGATE  |LOCAL|
+                                            -- NESTED_TUPLE_SOURCE  |LOCAL|
+                                        }
+                                  -- HASH_PARTITION_EXCHANGE [$$131]  |PARTITIONED|
+                                    -- SORT_GROUP_BY[$$114]  |PARTITIONED|
+                                            {
+                                              -- AGGREGATE  |LOCAL|
+                                                -- NESTED_TUPLE_SOURCE  |LOCAL|
+                                            }
+                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                        -- STREAM_PROJECT  |PARTITIONED|
+                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                            -- HYBRID_HASH_JOIN [$$120][$$114]  |PARTITIONED|
+                                              -- RANDOM_PARTITION_EXCHANGE  |PARTITIONED|
+                                                -- UNNEST  |UNPARTITIONED|
+                                                  -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
+                                              -- BROADCAST_EXCHANGE  |PARTITIONED|
+                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                    -- HYBRID_HASH_JOIN [$$121][$$118]  |PARTITIONED|
+                                                      -- HASH_PARTITION_EXCHANGE [$$121]  |PARTITIONED|
+                                                        -- STREAM_PROJECT  |PARTITIONED|
+                                                          -- STREAM_SELECT  |PARTITIONED|
+                                                            -- ASSIGN  |PARTITIONED|
+                                                              -- STREAM_PROJECT  |PARTITIONED|
+                                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                  -- DATASOURCE_SCAN (tpch.LineItem)  |PARTITIONED|
+                                                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                      -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                        -- STREAM_PROJECT  |PARTITIONED|
+                                                          -- ASSIGN  |PARTITIONED|
+                                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                              -- DATASOURCE_SCAN (tpch.Orders)  |PARTITIONED|
+                                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                  -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/tpch/q12_shipping_ps.plan b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/tpch/q12_shipping_ps.plan
new file mode 100644
index 0000000..0639aa6
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/optimizerts/results_cbo/tpch/q12_shipping_ps.plan
@@ -0,0 +1,95 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- ASSIGN  |PARTITIONED|
+        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+          -- STABLE_SORT [$$l_shipmode(ASC)]  |PARTITIONED|
+            -- RANGE_PARTITION_EXCHANGE [$$l_shipmode(ASC)]  |PARTITIONED|
+              -- FORWARD  |PARTITIONED|
+                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                  -- REPLICATE  |PARTITIONED|
+                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                      -- SORT_GROUP_BY[$$131]  |PARTITIONED|
+                              {
+                                -- AGGREGATE  |LOCAL|
+                                  -- NESTED_TUPLE_SOURCE  |LOCAL|
+                              }
+                        -- HASH_PARTITION_EXCHANGE [$$131]  |PARTITIONED|
+                          -- SORT_GROUP_BY[$$114]  |PARTITIONED|
+                                  {
+                                    -- AGGREGATE  |LOCAL|
+                                      -- NESTED_TUPLE_SOURCE  |LOCAL|
+                                  }
+                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                              -- STREAM_PROJECT  |PARTITIONED|
+                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                  -- HYBRID_HASH_JOIN [$$120][$$114]  |PARTITIONED|
+                                    -- RANDOM_PARTITION_EXCHANGE  |PARTITIONED|
+                                      -- UNNEST  |UNPARTITIONED|
+                                        -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
+                                    -- BROADCAST_EXCHANGE  |PARTITIONED|
+                                      -- STREAM_PROJECT  |PARTITIONED|
+                                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                          -- HYBRID_HASH_JOIN [$$122][$$118]  |PARTITIONED|
+                                            -- HASH_PARTITION_EXCHANGE [$$122]  |PARTITIONED|
+                                              -- STREAM_PROJECT  |PARTITIONED|
+                                                -- STREAM_SELECT  |PARTITIONED|
+                                                  -- ASSIGN  |PARTITIONED|
+                                                    -- STREAM_PROJECT  |PARTITIONED|
+                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                        -- DATASOURCE_SCAN (tpch.LineItem)  |PARTITIONED|
+                                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                            -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                              -- STREAM_PROJECT  |PARTITIONED|
+                                                -- ASSIGN  |PARTITIONED|
+                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                    -- DATASOURCE_SCAN (tpch.Orders)  |PARTITIONED|
+                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                        -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                -- BROADCAST_EXCHANGE  |PARTITIONED|
+                  -- AGGREGATE  |UNPARTITIONED|
+                    -- RANDOM_MERGE_EXCHANGE  |PARTITIONED|
+                      -- AGGREGATE  |PARTITIONED|
+                        -- STREAM_PROJECT  |PARTITIONED|
+                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                            -- REPLICATE  |PARTITIONED|
+                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                -- SORT_GROUP_BY[$$131]  |PARTITIONED|
+                                        {
+                                          -- AGGREGATE  |LOCAL|
+                                            -- NESTED_TUPLE_SOURCE  |LOCAL|
+                                        }
+                                  -- HASH_PARTITION_EXCHANGE [$$131]  |PARTITIONED|
+                                    -- SORT_GROUP_BY[$$114]  |PARTITIONED|
+                                            {
+                                              -- AGGREGATE  |LOCAL|
+                                                -- NESTED_TUPLE_SOURCE  |LOCAL|
+                                            }
+                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                        -- STREAM_PROJECT  |PARTITIONED|
+                                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                            -- HYBRID_HASH_JOIN [$$120][$$114]  |PARTITIONED|
+                                              -- RANDOM_PARTITION_EXCHANGE  |PARTITIONED|
+                                                -- UNNEST  |UNPARTITIONED|
+                                                  -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
+                                              -- BROADCAST_EXCHANGE  |PARTITIONED|
+                                                -- STREAM_PROJECT  |PARTITIONED|
+                                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                    -- HYBRID_HASH_JOIN [$$122][$$118]  |PARTITIONED|
+                                                      -- HASH_PARTITION_EXCHANGE [$$122]  |PARTITIONED|
+                                                        -- STREAM_PROJECT  |PARTITIONED|
+                                                          -- STREAM_SELECT  |PARTITIONED|
+                                                            -- ASSIGN  |PARTITIONED|
+                                                              -- STREAM_PROJECT  |PARTITIONED|
+                                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                  -- DATASOURCE_SCAN (tpch.LineItem)  |PARTITIONED|
+                                                                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                      -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
+                                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                        -- STREAM_PROJECT  |PARTITIONED|
+                                                          -- ASSIGN  |PARTITIONED|
+                                                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                              -- DATASOURCE_SCAN (tpch.Orders)  |PARTITIONED|
+                                                                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                                                                  -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/comparison/incomparable_types/incomparable_types.003.query.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/comparison/incomparable_types/incomparable_types.003.query.sqlpp
index 66e6595..c9f0619 100644
--- a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/comparison/incomparable_types/incomparable_types.003.query.sqlpp
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/comparison/incomparable_types/incomparable_types.003.query.sqlpp
@@ -17,10 +17,11 @@
  * under the License.
  */
 
+set `compiler.parallelism` "1";
 -- param max-warnings:string=10
 
 use test;
 
 from ds1 join ds2 on ds1.f /*+ hash-bcast */ = ds2.f
 where ds1.f > 1
-select ds1.f;
\ No newline at end of file
+select ds1.f;
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/open-closed/query-issue453-2/query-issue453-2.3.query.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/open-closed/query-issue453-2/query-issue453-2.3.query.sqlpp
index 31e68b0..0a81db6 100644
--- a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/open-closed/query-issue453-2/query-issue453-2.3.query.sqlpp
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/open-closed/query-issue453-2/query-issue453-2.3.query.sqlpp
@@ -25,8 +25,7 @@
 
 use test;
 
-
-select element d
+select d.int_m, d.int_o, d.string_m, d.string_o
 from  DataOpen as d
-order by d.id
+order by d.int_m, d.int_o, d.string_m, d.string_o;
 ;
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/results/api/cluster_state_1/cluster_state_1.1.regexadm b/asterixdb/asterix-app/src/test/resources/runtimets/results/api/cluster_state_1/cluster_state_1.1.regexadm
index 54793dc..d90e1f8 100644
--- a/asterixdb/asterix-app/src/test/resources/runtimets/results/api/cluster_state_1/cluster_state_1.1.regexadm
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/results/api/cluster_state_1/cluster_state_1.1.regexadm
@@ -11,7 +11,10 @@
     "azure.request.timeout" : 120,
     "compiler\.arrayindex" : true,
     "compiler.batch.lookup" : false,
+    "compiler.cbo" : false,
+    "compiler.cbotest" : true,
     "compiler\.external\.field\.pushdown" : true,
+    "compiler.forcejoinorder" : false,
     "compiler\.framesize" : 32768,
     "compiler\.groupmemory" : 163840,
     "compiler\.indexonly" : true,
@@ -19,6 +22,7 @@
     "compiler\.joinmemory" : 262144,
     "compiler\.min\.memory\.allocation" : true,
     "compiler\.parallelism" : 0,
+    "compiler.queryplanshape" : "zigzag",
     "compiler\.sort\.parallel" : false,
     "compiler\.sort\.samples" : 100,
     "compiler\.sortmemory" : 327680,
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/results/api/cluster_state_1_full/cluster_state_1_full.1.regexadm b/asterixdb/asterix-app/src/test/resources/runtimets/results/api/cluster_state_1_full/cluster_state_1_full.1.regexadm
index 06da0ad..efa091c 100644
--- a/asterixdb/asterix-app/src/test/resources/runtimets/results/api/cluster_state_1_full/cluster_state_1_full.1.regexadm
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/results/api/cluster_state_1_full/cluster_state_1_full.1.regexadm
@@ -11,7 +11,10 @@
     "azure.request.timeout" : 120,
     "compiler\.arrayindex" : true,
     "compiler.batch.lookup" : false,
+    "compiler.cbo" : false,
+    "compiler.cbotest" : true,
     "compiler\.external\.field\.pushdown" : true,
+    "compiler.forcejoinorder" : false,
     "compiler\.framesize" : 32768,
     "compiler\.groupmemory" : 163840,
     "compiler\.indexonly" : true,
@@ -19,6 +22,7 @@
     "compiler\.joinmemory" : 262144,
     "compiler\.min\.memory\.allocation" : true,
     "compiler\.parallelism" : -1,
+    "compiler.queryplanshape" : "zigzag",
     "compiler\.sort\.parallel" : true,
     "compiler\.sort\.samples" : 100,
     "compiler\.sortmemory" : 327680,
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/results/api/cluster_state_1_less/cluster_state_1_less.1.regexadm b/asterixdb/asterix-app/src/test/resources/runtimets/results/api/cluster_state_1_less/cluster_state_1_less.1.regexadm
index bef14c1..732f05c 100644
--- a/asterixdb/asterix-app/src/test/resources/runtimets/results/api/cluster_state_1_less/cluster_state_1_less.1.regexadm
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/results/api/cluster_state_1_less/cluster_state_1_less.1.regexadm
@@ -11,7 +11,10 @@
     "azure.request.timeout" : 120,
     "compiler\.arrayindex" : true,
     "compiler.batch.lookup" : false,
+    "compiler.cbo" : false,
+    "compiler.cbotest" : true,
     "compiler\.external\.field\.pushdown" : true,
+    "compiler.forcejoinorder" : false,
     "compiler\.framesize" : 32768,
     "compiler\.groupmemory" : 163840,
     "compiler\.indexonly" : true,
@@ -19,6 +22,7 @@
     "compiler\.joinmemory" : 262144,
     "compiler\.min\.memory\.allocation" : true,
     "compiler\.parallelism" : 3,
+    "compiler.queryplanshape" : "zigzag",
     "compiler\.sort\.parallel" : true,
     "compiler\.sort\.samples" : 100,
     "compiler\.sortmemory" : 327680,
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/results/misc/metadata_only_01/metadata_only_01.1.regex b/asterixdb/asterix-app/src/test/resources/runtimets/results/misc/metadata_only_01/metadata_only_01.1.regex
index 94ff0a4..7bc4c42 100644
--- a/asterixdb/asterix-app/src/test/resources/runtimets/results/misc/metadata_only_01/metadata_only_01.1.regex
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/results/misc/metadata_only_01/metadata_only_01.1.regex
@@ -1 +1 @@
-/memory\D+917504/
\ No newline at end of file
+/memory\D+917504/
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/results/misc/metadata_only_01/metadata_only_01.2.regex b/asterixdb/asterix-app/src/test/resources/runtimets/results/misc/metadata_only_01/metadata_only_01.2.regex
index 6af6770..acf8405 100644
--- a/asterixdb/asterix-app/src/test/resources/runtimets/results/misc/metadata_only_01/metadata_only_01.2.regex
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/results/misc/metadata_only_01/metadata_only_01.2.regex
@@ -1 +1 @@
-/memory\D+1146880/
\ No newline at end of file
+/memory\D+1146880/
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/results/open-closed/query-issue453-2/query-issue453-2.1.adm b/asterixdb/asterix-app/src/test/resources/runtimets/results/open-closed/query-issue453-2/query-issue453-2.1.adm
index 67218de..4b8eef0 100644
--- a/asterixdb/asterix-app/src/test/resources/runtimets/results/open-closed/query-issue453-2/query-issue453-2.1.adm
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/results/open-closed/query-issue453-2/query-issue453-2.1.adm
@@ -1,16 +1,16 @@
-{ "id": 1, "int_m": 1, "int_o": 1, "string_m": "a", "string_o": "a" }
-{ "id": 2, "int_m": 1, "int_o": 1, "string_m": "a", "string_o": null }
-{ "id": 3, "int_m": 1, "int_o": 1, "string_m": "b", "string_o": "a" }
-{ "id": 4, "int_m": 1, "int_o": 1, "string_m": "b", "string_o": null }
-{ "id": 5, "int_m": 1, "int_o": null, "string_m": "a", "string_o": "a" }
-{ "id": 6, "int_m": 1, "int_o": null, "string_m": "a", "string_o": null }
-{ "id": 7, "int_m": 1, "int_o": null, "string_m": "b", "string_o": "a" }
-{ "id": 8, "int_m": 1, "int_o": null, "string_m": "b", "string_o": null }
-{ "id": 9, "int_m": 2, "int_o": 1, "string_m": "a", "string_o": "a" }
-{ "id": 10, "int_m": 2, "int_o": 1, "string_m": "a", "string_o": null }
-{ "id": 11, "int_m": 2, "int_o": 1, "string_m": "b", "string_o": "a" }
-{ "id": 12, "int_m": 2, "int_o": 1, "string_m": "b", "string_o": null }
-{ "id": 13, "int_m": 2, "int_o": null, "string_m": "a", "string_o": "a" }
-{ "id": 14, "int_m": 2, "int_o": null, "string_m": "a", "string_o": null }
-{ "id": 15, "int_m": 2, "int_o": null, "string_m": "b", "string_o": "a" }
-{ "id": 16, "int_m": 2, "int_o": null, "string_m": "b", "string_o": null }
+{ "int_m": 1, "int_o": null, "string_m": "a", "string_o": null }
+{ "int_m": 1, "int_o": null, "string_m": "a", "string_o": "a" }
+{ "int_m": 1, "int_o": null, "string_m": "b", "string_o": null }
+{ "int_m": 1, "int_o": null, "string_m": "b", "string_o": "a" }
+{ "int_m": 1, "int_o": 1, "string_m": "a", "string_o": null }
+{ "int_m": 1, "int_o": 1, "string_m": "a", "string_o": "a" }
+{ "int_m": 1, "int_o": 1, "string_m": "b", "string_o": null }
+{ "int_m": 1, "int_o": 1, "string_m": "b", "string_o": "a" }
+{ "int_m": 2, "int_o": null, "string_m": "a", "string_o": null }
+{ "int_m": 2, "int_o": null, "string_m": "a", "string_o": "a" }
+{ "int_m": 2, "int_o": null, "string_m": "b", "string_o": null }
+{ "int_m": 2, "int_o": null, "string_m": "b", "string_o": "a" }
+{ "int_m": 2, "int_o": 1, "string_m": "a", "string_o": null }
+{ "int_m": 2, "int_o": 1, "string_m": "a", "string_o": "a" }
+{ "int_m": 2, "int_o": 1, "string_m": "b", "string_o": null }
+{ "int_m": 2, "int_o": 1, "string_m": "b", "string_o": "a" }
\ No newline at end of file
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/results_parser_sqlpp/open-closed/query-issue453-2/query-issue453-2.3.ast b/asterixdb/asterix-app/src/test/resources/runtimets/results_parser_sqlpp/open-closed/query-issue453-2/query-issue453-2.3.ast
index ffedb2d..057e63a 100644
--- a/asterixdb/asterix-app/src/test/resources/runtimets/results_parser_sqlpp/open-closed/query-issue453-2/query-issue453-2.3.ast
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/results_parser_sqlpp/open-closed/query-issue453-2/query-issue453-2.3.ast
@@ -1,7 +1,26 @@
 DataverseUse test
 Query:
-SELECT ELEMENT [
-Variable [ Name=$d ]
+SELECT [
+FieldAccessor [
+  Variable [ Name=$d ]
+  Field=int_m
+]
+int_m
+FieldAccessor [
+  Variable [ Name=$d ]
+  Field=int_o
+]
+int_o
+FieldAccessor [
+  Variable [ Name=$d ]
+  Field=string_m
+]
+string_m
+FieldAccessor [
+  Variable [ Name=$d ]
+  Field=string_o
+]
+string_o
 ]
 FROM [  FunctionCall asterix.dataset@1[
     LiteralExpr [STRING] [test.DataOpen]
@@ -11,7 +30,22 @@
 Orderby
   FieldAccessor [
     Variable [ Name=$d ]
-    Field=id
+    Field=int_m
+  ]
+  ASC
+  FieldAccessor [
+    Variable [ Name=$d ]
+    Field=int_o
+  ]
+  ASC
+  FieldAccessor [
+    Variable [ Name=$d ]
+    Field=string_m
+  ]
+  ASC
+  FieldAccessor [
+    Variable [ Name=$d ]
+    Field=string_o
   ]
   ASC
 
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_sqlpp.xml b/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_sqlpp.xml
index 134ba90..442adc8 100644
--- a/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_sqlpp.xml
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_sqlpp.xml
@@ -3608,10 +3608,10 @@
     <test-case FilePath="comparison" check-warnings="true">
       <compilation-unit name="incomparable_types">
         <output-dir compare="Text">incomparable_types</output-dir>
-          <expected-warn>Incomparable input types: string and bigint (in line 25, at column 13)</expected-warn>
+          <expected-warn>Incomparable input types: string and bigint (in line 26, at column 13)</expected-warn>
           <expected-warn>Incomparable input types: array and bigint (in line 23, at column 7)</expected-warn>
           <expected-warn>Incomparable input types: point and point (in line 24, at column 18)</expected-warn>
-          <expected-warn>Incomparable input types: bigint and string (in line 24, at column 46)</expected-warn>
+          <expected-warn>Incomparable input types: bigint and string (in line 25, at column 46)</expected-warn>
       </compilation-unit>
     </test-case>
   </test-group>
@@ -15391,9 +15391,9 @@
         <output-dir compare="Text">inapplicable-hint-warning</output-dir>
         <expected-warn>HYR10006: Could not apply Group By hint: hash</expected-warn>
         <expected-warn>ASX1107: Unexpected hint: indexnl. "hash" expected at this location</expected-warn>
-        <expected-warn>ASX1107: Unexpected hint: hash. "hash-bcast", "indexnl", "skip-index", "use-index" expected at this location</expected-warn>
-        <expected-warn>ASX1107: Unexpected hint: auto. "indexnl", "skip-index", "use-index" expected at this location</expected-warn>
-        <expected-warn>ASX1107: Unexpected hint: hash. "indexnl", "range", "skip-index", "spatial-partitioning", "use-index" expected at this location</expected-warn>
+        <expected-warn>ASX1107: Unexpected hint: hash. "hash-bcast", "indexnl", "hashjoin", "skip-index", "use-index", "selectivity", "productivity" expected at this location</expected-warn>
+        <expected-warn>ASX1107: Unexpected hint: auto. "indexnl", "skip-index", "hashjoin", "use-index", "selectivity" expected at this location</expected-warn>
+        <expected-warn>ASX1107: Unexpected hint: hash. "indexnl", "range", "hashjoin", "skip-index", "spatial-partitioning", "use-index" expected at this location</expected-warn>
         <expected-warn>ASX1107: Unexpected hint: hash. None expected at this location</expected-warn>
       </compilation-unit>
     </test-case>
@@ -15414,12 +15414,12 @@
       <compilation-unit name="unknown-hint-warning">
         <output-dir compare="Text">unknown-hint-warning</output-dir>
         <expected-warn>ASX1107: Unexpected hint: unknown_hint_groupby. "hash" expected at this location</expected-warn>
-        <expected-warn>ASX1107: Unexpected hint: unknown_hint_relexpr. "hash-bcast", "indexnl", "skip-index", "use-index" expected at this location</expected-warn>
-        <expected-warn>ASX1107: Unexpected hint: unknown_hint_between. "indexnl", "skip-index", "use-index" expected at this location</expected-warn>
-        <expected-warn>ASX1107: Unexpected hint: unknown_hint_funcall. "indexnl", "range", "skip-index", "spatial-partitioning", "use-index" expected at this location</expected-warn>
+        <expected-warn>ASX1107: Unexpected hint: unknown_hint_relexpr. "hash-bcast", "indexnl", "hashjoin", "skip-index", "use-index", "selectivity", "productivity" expected at this location</expected-warn>
+        <expected-warn>ASX1107: Unexpected hint: unknown_hint_between. "indexnl", "skip-index", "hashjoin", "use-index", "selectivity" expected at this location</expected-warn>
+        <expected-warn>ASX1107: Unexpected hint: unknown_hint_funcall. "indexnl", "range", "hashjoin", "skip-index", "spatial-partitioning", "use-index" expected at this location</expected-warn>
         <expected-warn>ASX1107: Unexpected hint: unknown_hint_elsewhere. None expected at this location</expected-warn>
-        <expected-warn>ASX1107: Unexpected hint: unknown_hint_relexpr_6. "hash-bcast", "indexnl", "skip-index", "use-index" expected at this location</expected-warn>
-        <expected-warn>ASX1107: Unexpected hint: unknown_hint_relexpr_6. "hash-bcast", "indexnl", "skip-index", "use-index" expected at this location</expected-warn>
+        <expected-warn>ASX1107: Unexpected hint: unknown_hint_relexpr_6. "hash-bcast", "indexnl", "hashjoin", "skip-index", "use-index", "selectivity", "productivity" expected at this location</expected-warn>
+        <expected-warn>ASX1107: Unexpected hint: unknown_hint_relexpr_6. "hash-bcast", "indexnl", "hashjoin", "skip-index", "use-index", "selectivity", "productivity" expected at this location</expected-warn>
       </compilation-unit>
     </test-case>
     <test-case FilePath="warnings">
diff --git a/asterixdb/asterix-common/src/main/java/org/apache/asterix/common/config/CompilerProperties.java b/asterixdb/asterix-common/src/main/java/org/apache/asterix/common/config/CompilerProperties.java
index 9599435..62691a0 100644
--- a/asterixdb/asterix-common/src/main/java/org/apache/asterix/common/config/CompilerProperties.java
+++ b/asterixdb/asterix-common/src/main/java/org/apache/asterix/common/config/CompilerProperties.java
@@ -23,6 +23,7 @@
 import static org.apache.hyracks.control.common.config.OptionTypes.INTEGER_BYTE_UNIT;
 import static org.apache.hyracks.control.common.config.OptionTypes.LONG_BYTE_UNIT;
 import static org.apache.hyracks.control.common.config.OptionTypes.POSITIVE_INTEGER;
+import static org.apache.hyracks.control.common.config.OptionTypes.STRING;
 import static org.apache.hyracks.util.StorageUtil.StorageUnit.KILOBYTE;
 import static org.apache.hyracks.util.StorageUtil.StorageUnit.MEGABYTE;
 
@@ -107,7 +108,17 @@
         COMPILER_BATCH_LOOKUP(
                 BOOLEAN,
                 AlgebricksConfig.BATCH_LOOKUP_DEFAULT,
-                "Enable/disable batch point-lookups when running queries with secondary indexes");
+                "Enable/disable batch point-lookups when running queries with secondary indexes"),
+        COMPILER_CBO(BOOLEAN, AlgebricksConfig.CBO_DEFAULT, "Set the mode for cost based optimization"),
+        COMPILER_CBOTEST(BOOLEAN, AlgebricksConfig.CBO_TEST_DEFAULT, "Set the mode for cost based optimization"),
+        COMPILER_FORCEJOINORDER(
+                BOOLEAN,
+                AlgebricksConfig.FORCE_JOIN_ORDER_DEFAULT,
+                "Set the mode for forcing the join order in a query plan"),
+        COMPILER_QUERYPLANSHAPE(
+                STRING,
+                AlgebricksConfig.QUERY_PLAN_SHAPE_DEFAULT,
+                "Set the mode for forcing the shape of the query plan");
 
         private final IOptionType type;
         private final Object defaultValue;
@@ -179,6 +190,14 @@
 
     public static final String COMPILER_BATCHED_LOOKUP_KEY = Option.COMPILER_BATCH_LOOKUP.ini();
 
+    public static final String COMPILER_CBO_KEY = Option.COMPILER_CBO.ini();
+
+    public static final String COMPILER_CBO_TEST_KEY = Option.COMPILER_CBOTEST.ini();
+
+    public static final String COMPILER_FORCE_JOIN_ORDER_KEY = Option.COMPILER_FORCEJOINORDER.ini();
+
+    public static final String COMPILER_QUERY_PLAN_SHAPE_KEY = Option.COMPILER_QUERYPLANSHAPE.ini();
+
     public static final int COMPILER_PARALLELISM_AS_STORAGE = 0;
 
     public CompilerProperties(PropertiesAccessor accessor) {
@@ -256,4 +275,25 @@
     public boolean isBatchLookup() {
         return accessor.getBoolean(Option.COMPILER_BATCH_LOOKUP);
     }
+
+    public boolean getCBOMode() {
+        return accessor.getBoolean(Option.COMPILER_CBO);
+    }
+
+    public boolean getCBOTestMode() {
+        return accessor.getBoolean(Option.COMPILER_CBOTEST);
+    }
+
+    public boolean getForceJoinOrderMode() {
+        return accessor.getBoolean(Option.COMPILER_FORCEJOINORDER);
+    }
+
+    public String getQueryPlanShapeMode() {
+        String queryPlanShapeMode = accessor.getString(Option.COMPILER_QUERYPLANSHAPE);
+        if (!(queryPlanShapeMode.equals(AlgebricksConfig.QUERY_PLAN_SHAPE_ZIGZAG)
+                || queryPlanShapeMode.equals(AlgebricksConfig.QUERY_PLAN_SHAPE_LEFTDEEP)
+                || queryPlanShapeMode.equals(AlgebricksConfig.QUERY_PLAN_SHAPE_RIGHTDEEP)))
+            return AlgebricksConfig.QUERY_PLAN_SHAPE_DEFAULT;
+        return queryPlanShapeMode;
+    }
 }
diff --git a/asterixdb/asterix-common/src/main/java/org/apache/asterix/common/config/OptimizationConfUtil.java b/asterixdb/asterix-common/src/main/java/org/apache/asterix/common/config/OptimizationConfUtil.java
index ab3a925..e1edc1c 100644
--- a/asterixdb/asterix-common/src/main/java/org/apache/asterix/common/config/OptimizationConfUtil.java
+++ b/asterixdb/asterix-common/src/main/java/org/apache/asterix/common/config/OptimizationConfUtil.java
@@ -79,6 +79,14 @@
                 compilerProperties.getExternalScanMemorySize(), sourceLoc);
         boolean batchLookup = getBoolean(querySpecificConfig, CompilerProperties.COMPILER_BATCHED_LOOKUP_KEY,
                 compilerProperties.isBatchLookup());
+        boolean cbo =
+                getBoolean(querySpecificConfig, CompilerProperties.COMPILER_CBO_KEY, compilerProperties.getCBOMode());
+        boolean cboTest = getBoolean(querySpecificConfig, CompilerProperties.COMPILER_CBO_TEST_KEY,
+                compilerProperties.getCBOTestMode());
+        boolean forceJoinOrder = getBoolean(querySpecificConfig, CompilerProperties.COMPILER_FORCE_JOIN_ORDER_KEY,
+                compilerProperties.getForceJoinOrderMode());
+        String queryPlanShape = getString(querySpecificConfig, CompilerProperties.COMPILER_QUERY_PLAN_SHAPE_KEY,
+                compilerProperties.getQueryPlanShapeMode());
 
         PhysicalOptimizationConfig physOptConf = new PhysicalOptimizationConfig();
         physOptConf.setFrameSize(frameSize);
@@ -98,6 +106,10 @@
         physOptConf.setArrayIndexEnabled(arrayIndex);
         physOptConf.setExternalScanBufferSize(externalScanBufferSize);
         physOptConf.setBatchLookup(batchLookup);
+        physOptConf.setCBOMode(cbo);
+        physOptConf.setCBOTestMode(cboTest);
+        physOptConf.setForceJoinOrderMode(forceJoinOrder);
+        physOptConf.setQueryPlanShapeMode(queryPlanShape);
         return physOptConf;
     }
 
@@ -175,4 +187,12 @@
         }
         return defaultValue;
     }
+
+    private static String getString(Map<String, Object> queryConfig, String queryConfigKey, String defaultValue) {
+        String valueInQuery = (String) queryConfig.get(queryConfigKey);
+        if (valueInQuery != null) {
+            return valueInQuery;
+        }
+        return defaultValue;
+    }
 }
diff --git a/asterixdb/asterix-lang-sqlpp/src/main/java/org/apache/asterix/lang/sqlpp/parser/SqlppHint.java b/asterixdb/asterix-lang-sqlpp/src/main/java/org/apache/asterix/lang/sqlpp/parser/SqlppHint.java
index 925140b..f565fcd 100644
--- a/asterixdb/asterix-lang-sqlpp/src/main/java/org/apache/asterix/lang/sqlpp/parser/SqlppHint.java
+++ b/asterixdb/asterix-lang-sqlpp/src/main/java/org/apache/asterix/lang/sqlpp/parser/SqlppHint.java
@@ -33,6 +33,7 @@
     DATETIME_ADD_RAND_HOURS_HINT("datetime-add-rand-hours"),
     DATETIME_BETWEEN_YEARS_HINT("datetime-between-years"),
     HASH_GROUP_BY_HINT("hash"),
+    HASH_JOIN_HINT("hashjoin"),
     INDEXED_NESTED_LOOP_JOIN_HINT("indexnl"),
     INMEMORY_HINT("inmem"),
     INSERT_RAND_INT_HINT("insert-rand-int"),
@@ -46,6 +47,8 @@
     VAL_FILE_HINT("val-files"),
     VAL_FILE_SAME_INDEX_HINT("val-file-same-idx"),
     GEN_FIELDS_HINT("gen-fields"),
+    SINGLE_DATASET_PREDICATE_SELECTIVITY_HINT("selectivity"),
+    JOIN_PREDICATE_PRODUCTIVITY_HINT("productivity"),
 
     // data generator hints
     DGEN_HINT("dgen");
diff --git a/asterixdb/asterix-lang-sqlpp/src/main/java/org/apache/asterix/lang/sqlpp/rewrites/visitor/OperatorExpressionVisitor.java b/asterixdb/asterix-lang-sqlpp/src/main/java/org/apache/asterix/lang/sqlpp/rewrites/visitor/OperatorExpressionVisitor.java
index 93a14ca..7967f36 100644
--- a/asterixdb/asterix-lang-sqlpp/src/main/java/org/apache/asterix/lang/sqlpp/rewrites/visitor/OperatorExpressionVisitor.java
+++ b/asterixdb/asterix-lang-sqlpp/src/main/java/org/apache/asterix/lang/sqlpp/rewrites/visitor/OperatorExpressionVisitor.java
@@ -45,6 +45,7 @@
 import org.apache.asterix.lang.sqlpp.visitor.base.AbstractSqlppExpressionScopingVisitor;
 import org.apache.asterix.om.functions.BuiltinFunctions;
 import org.apache.hyracks.algebricks.core.algebra.expressions.IExpressionAnnotation;
+import org.apache.hyracks.algebricks.core.algebra.expressions.PredicateCardinalityAnnotation;
 import org.apache.hyracks.api.exceptions.SourceLocation;
 
 public class OperatorExpressionVisitor extends AbstractSqlppExpressionScopingVisitor {
@@ -85,6 +86,7 @@
     private Expression processLikeOperator(OperatorExpr operatorExpr, OperatorType opType) {
         CallExpr likeExpr =
                 new CallExpr(new FunctionSignature(BuiltinFunctions.STRING_LIKE), operatorExpr.getExprList());
+        likeExpr.addHints(operatorExpr.getHints());
         likeExpr.setSourceLocation(operatorExpr.getSourceLocation());
         switch (opType) {
             case LIKE:
@@ -135,6 +137,20 @@
         return callExpr;
     }
 
+    private List<IExpressionAnnotation> removeSelectivityHints(OperatorExpr expr) {
+        if (expr.hasHints()) {
+            List<IExpressionAnnotation> copyHintsExceptSelectivity = new ArrayList<>();
+            for (IExpressionAnnotation h : expr.getHints()) {
+                if (!(h.getClass().equals(PredicateCardinalityAnnotation.class))) {
+                    copyHintsExceptSelectivity.add(h);
+                }
+            }
+            return copyHintsExceptSelectivity;
+        } else {
+            return expr.getHints();
+        }
+    }
+
     private Expression processBetweenOperator(OperatorExpr operatorExpr, OperatorType opType)
             throws CompilationException {
         // The grammar guarantees that the BETWEEN operator gets exactly three expressions.
@@ -147,8 +163,11 @@
                 operatorExpr.getSourceLocation());
         // Creates the expression target <= right.
         Expression targetCopy = (Expression) SqlppRewriteUtil.deepCopy(target);
+
+        // remove any selectivity hints from operatorExpr; do not want to duplicate those hints
         Expression rightComparison = createOperatorExpression(OperatorType.LE, targetCopy, right,
-                operatorExpr.getHints(), operatorExpr.getSourceLocation());
+                removeSelectivityHints(operatorExpr), operatorExpr.getSourceLocation());
+
         Expression andExpr = createOperatorExpression(OperatorType.AND, leftComparison, rightComparison, null,
                 operatorExpr.getSourceLocation());
         switch (opType) {
diff --git a/asterixdb/asterix-lang-sqlpp/src/main/javacc/SQLPP.jj b/asterixdb/asterix-lang-sqlpp/src/main/javacc/SQLPP.jj
index a37b9cc..6eb05cb 100644
--- a/asterixdb/asterix-lang-sqlpp/src/main/javacc/SQLPP.jj
+++ b/asterixdb/asterix-lang-sqlpp/src/main/javacc/SQLPP.jj
@@ -218,7 +218,10 @@
 import org.apache.hyracks.algebricks.common.utils.Triple;
 import org.apache.hyracks.algebricks.common.exceptions.AlgebricksException;
 import org.apache.hyracks.algebricks.core.algebra.expressions.BroadcastExpressionAnnotation;
+import org.apache.hyracks.algebricks.core.algebra.expressions.HashJoinExpressionAnnotation;
 import org.apache.hyracks.algebricks.core.algebra.expressions.IExpressionAnnotation;
+import org.apache.hyracks.algebricks.core.algebra.expressions.JoinProductivityAnnotation;
+import org.apache.hyracks.algebricks.core.algebra.expressions.PredicateCardinalityAnnotation;
 import org.apache.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
 import org.apache.hyracks.api.exceptions.IWarningCollector;
 import org.apache.hyracks.api.exceptions.SourceLocation;
@@ -226,6 +229,8 @@
 import org.apache.hyracks.dataflow.common.data.partition.range.RangeMap;
 import org.apache.hyracks.util.LogRedactionUtil;
 import org.apache.hyracks.util.StringUtil;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 class SQLPPParser extends ScopeChecker implements IParser {
 
@@ -651,10 +656,45 @@
     private IExpressionAnnotation parseExpressionAnnotation(Token hintToken) {
       // placeholder for the annotation that should be returned if this hint's parameters cannot be parsed
       IExpressionAnnotation onParseErrorReturn = null;
+      double selectivity, cardinality, productivity;
+      Pattern number = Pattern.compile("\\d+\\.\\d+");
+      Pattern stringNumber = Pattern.compile("\\w+\\s+\\d+\\.\\d+");
+      Pattern lessThanOnePat = Pattern.compile("0\\.\\d+");
       try {
         switch (hintToken.hint) {
+          case SINGLE_DATASET_PREDICATE_SELECTIVITY_HINT:
+            selectivity = 1.0; // uninitialized
+            if (hintToken.hintParams != null) {
+            Matcher mat = lessThanOnePat.matcher(hintToken.hintParams);
+            if (mat.find()) {
+                selectivity = Double.parseDouble (mat.group());
+                }
+            }
+
+            return new PredicateCardinalityAnnotation(selectivity);
+          case JOIN_PREDICATE_PRODUCTIVITY_HINT:
+            productivity = 1.0; // uninitialized
+            String leftSideDataSet = null;
+            if (hintToken.hintParams != null) {
+                Matcher StringNum = stringNumber.matcher(hintToken.hintParams);
+
+                if (StringNum.find()) {
+                    String matchedGroup = StringNum.group();
+                    Pattern var = Pattern.compile("[a-zA-Z]\\w*"); // any word character [a-zA-Z_0-9]
+                    Matcher matVar = var.matcher(matchedGroup);
+                    if (matVar.find())
+                        leftSideDataSet = matVar.group();
+                    Matcher numMat = number.matcher(matchedGroup);
+                    if (numMat.find())
+                        productivity = Double.parseDouble (numMat.group());
+                }
+            }
+            // attach hint to global scope
+            return new JoinProductivityAnnotation (productivity, leftSideDataSet);
           case HASH_BROADCAST_JOIN_HINT:
             return new BroadcastExpressionAnnotation(BroadcastExpressionAnnotation.BroadcastSide.RIGHT);
+          case HASH_JOIN_HINT:
+            return new HashJoinExpressionAnnotation(HashJoinExpressionAnnotation.BuildSide.RIGHT);
           case INDEXED_NESTED_LOOP_JOIN_HINT:
             if (hintToken.hintParams == null) {
               return IndexedNLJoinExpressionAnnotation.INSTANCE_ANY_INDEX;
@@ -3043,7 +3083,7 @@
   // Note: there's a copy of this production in PrimaryExpr() (LOOKAHEAD for FunctionCallExpr())
   //       that copy must be kept in sync with this code
   prefix = MultipartIdentifierWithHints(
-    SqlppHint.INDEXED_NESTED_LOOP_JOIN_HINT, SqlppHint.RANGE_HINT, SqlppHint.SKIP_SECONDARY_INDEX_SEARCH_HINT,
+    SqlppHint.INDEXED_NESTED_LOOP_JOIN_HINT, SqlppHint.RANGE_HINT, SqlppHint.HASH_JOIN_HINT, SqlppHint.SKIP_SECONDARY_INDEX_SEARCH_HINT,
     SqlppHint.SPATIAL_JOIN_HINT, SqlppHint.USE_SECONDARY_INDEX_SEARCH_HINT
   )
   (<SHARP> suffix = Identifier())?
@@ -3530,6 +3570,7 @@
   Token opToken = null;
   Expression operand = null;
   IExpressionAnnotation annotation = null;
+  List<IExpressionAnnotation> annotationList = new ArrayList<IExpressionAnnotation>();
 }
 {
     operand = BetweenExpr()
@@ -3543,10 +3584,13 @@
           }
           Token hintToken = fetchHint(token,
             SqlppHint.HASH_BROADCAST_JOIN_HINT, SqlppHint.INDEXED_NESTED_LOOP_JOIN_HINT,
-            SqlppHint.SKIP_SECONDARY_INDEX_SEARCH_HINT, SqlppHint.USE_SECONDARY_INDEX_SEARCH_HINT
+            SqlppHint.HASH_JOIN_HINT, SqlppHint.SKIP_SECONDARY_INDEX_SEARCH_HINT, SqlppHint.USE_SECONDARY_INDEX_SEARCH_HINT,
+            SqlppHint.SINGLE_DATASET_PREDICATE_SELECTIVITY_HINT, SqlppHint.JOIN_PREDICATE_PRODUCTIVITY_HINT
           );
-          if (hintToken != null) {
+          while (hintToken != null) {
             annotation = parseExpressionAnnotation(hintToken);
+            annotationList.add(annotation);
+            hintToken = hintToken.specialToken;
           }
           String operator = opToken.image.toLowerCase();
           if (operator.equals("<>")){
@@ -3576,7 +3620,7 @@
 
      {
        if (annotation != null) {
-         op.addHint(annotation);
+         op.addHints(annotationList);
        }
        return op==null? operand: op;
      }
@@ -3596,8 +3640,8 @@
       (<NOT> { not = true; })? <BETWEEN>
         {
           Token hintToken = fetchHint(token,
-            SqlppHint.INDEXED_NESTED_LOOP_JOIN_HINT, SqlppHint.SKIP_SECONDARY_INDEX_SEARCH_HINT,
-            SqlppHint.USE_SECONDARY_INDEX_SEARCH_HINT
+            SqlppHint.INDEXED_NESTED_LOOP_JOIN_HINT, SqlppHint.SKIP_SECONDARY_INDEX_SEARCH_HINT, SqlppHint.HASH_JOIN_HINT,
+            SqlppHint.USE_SECONDARY_INDEX_SEARCH_HINT, SqlppHint.SINGLE_DATASET_PREDICATE_SELECTIVITY_HINT
           );
           if (hintToken != null) {
             annotation = parseExpressionAnnotation(hintToken);
@@ -3681,6 +3725,7 @@
   boolean not = false;
   OperatorExpr op = null;
   Expression operand = null;
+  IExpressionAnnotation annotation = null;
 }
 {
     operand = ConcatExpr()
@@ -3688,6 +3733,10 @@
         LOOKAHEAD(2)
         (<NOT> { not = true; })? <LIKE>
         {
+          Token hintToken = fetchHint(token, SqlppHint.SINGLE_DATASET_PREDICATE_SELECTIVITY_HINT);
+          if (hintToken != null) {
+               annotation = parseExpressionAnnotation(hintToken);
+          }
           op = new OperatorExpr();
           op.addOperand(operand);
           op.setCurrentop(true);
@@ -3702,6 +3751,9 @@
           } catch (CompilationException e){
             throw new SqlppParseException(getSourceLocation(token), e.getMessage());
           }
+          if (annotation != null) {
+             op.addHint(annotation);
+          }
         }
 
         operand = ConcatExpr()
@@ -5353,11 +5405,12 @@
 
     void CommonTokenAction(Token token) {
       Token hintToken = token.specialToken;
-      if (hintToken != null) {
+      while (hintToken != null) { // make this a while loop
         hintToken.sourceLocation = new SourceLocation(hintToken.beginLine, hintToken.beginColumn);
         String text = hintToken.image.substring(1).trim();
         boolean hintFound = hintToken.parseHint(text);
         hintCollector.put(hintToken.sourceLocation, hintFound ? hintToken.hint.getIdentifier() : hintToken.hintParams);
+        hintToken = hintToken.specialToken;
       }
     }
 }
diff --git a/asterixdb/asterix-metadata/src/main/java/org/apache/asterix/metadata/declared/SampleDataSource.java b/asterixdb/asterix-metadata/src/main/java/org/apache/asterix/metadata/declared/SampleDataSource.java
index 418cb8e..8ed3e16 100644
--- a/asterixdb/asterix-metadata/src/main/java/org/apache/asterix/metadata/declared/SampleDataSource.java
+++ b/asterixdb/asterix-metadata/src/main/java/org/apache/asterix/metadata/declared/SampleDataSource.java
@@ -74,4 +74,4 @@
     private static DataSourceId createSampleDataSourceId(Dataset dataset, String sampleIndexName) {
         return new DataSourceId(dataset.getDataverseName(), dataset.getDatasetName(), new String[] { sampleIndexName });
     }
-}
\ No newline at end of file
+}
diff --git a/asterixdb/asterix-server/src/test/resources/NCServiceExecutionIT/cc.conf b/asterixdb/asterix-server/src/test/resources/NCServiceExecutionIT/cc.conf
index 1c6d574..2523b6f 100644
--- a/asterixdb/asterix-server/src/test/resources/NCServiceExecutionIT/cc.conf
+++ b/asterixdb/asterix-server/src/test/resources/NCServiceExecutionIT/cc.conf
@@ -46,5 +46,7 @@
 heartbeat.max.misses=25
 
 [common]
+compiler.cbo=false
+compiler.cbotest=true
 log.dir = ../asterix-server/target/NCServiceExecutionIT
 log.level = INFO
\ No newline at end of file
diff --git a/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/base/ILogicalExpression.java b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/base/ILogicalExpression.java
index aac660a..1e4a388 100644
--- a/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/base/ILogicalExpression.java
+++ b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/base/ILogicalExpression.java
@@ -41,32 +41,27 @@
     // constraints (e.g., FDs, equivalences)
 
     /**
-     * @param fds
-     *            Output argument: functional dependencies that can be inferred
-     *            from this expression.
-     * @param equivClasses
-     *            Output argument: Equivalence classes that can be inferred from
-     *            this expression.
+     * @param fds          Output argument: functional dependencies that can be inferred
+     *                     from this expression.
+     * @param equivClasses Output argument: Equivalence classes that can be inferred from
+     *                     this expression.
      */
     public void getConstraintsAndEquivClasses(Collection<FunctionalDependency> fds,
             Map<LogicalVariable, EquivalenceClass> equivClasses);
 
     /**
-     * @param fds
-     *            Output argument: functional dependencies that can be inferred
-     *            from this expression.
-     * @param outerVars
-     *            Input argument: variables coming from outer branch(es), e.g.,
-     *            the left branch of a left outer join.
+     * @param fds       Output argument: functional dependencies that can be inferred
+     *                  from this expression.
+     * @param outerVars Input argument: variables coming from outer branch(es), e.g.,
+     *                  the left branch of a left outer join.
      */
     public void getConstraintsForOuterJoin(Collection<FunctionalDependency> fds, Collection<LogicalVariable> outerVars);
 
     /**
-     * @param conjs
-     *            Output argument: a list of expression whose conjunction, in
-     *            any order, can replace the current expression.
+     * @param conjs Output argument: a list of expression whose conjunction, in
+     *              any order, can replace the current expression.
      * @return true if the expression can be broken in at least two conjuncts,
-     *         false otherwise.
+     * false otherwise.
      */
     public boolean splitIntoConjuncts(List<Mutable<ILogicalExpression>> conjs);
 
diff --git a/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/base/OperatorAnnotations.java b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/base/OperatorAnnotations.java
index cbe0882..3b44a97 100644
--- a/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/base/OperatorAnnotations.java
+++ b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/base/OperatorAnnotations.java
@@ -29,4 +29,10 @@
     // Integer
     public static final String MAX_NUMBER_FRAMES = "MAX_NUMBER_FRAMES"; // -->
     // Integer
+    public static final String OP_INPUT_CARDINALITY = "INPUT_CARDINALITY";
+    public static final String OP_OUTPUT_CARDINALITY = "OUTPUT_CARDINALITY";
+    public static final String OP_COST_TOTAL = "TOTAL_COST";
+    public static final String OP_COST_LOCAL = "OP_COST";
+    public static final String OP_LEFT_EXCHANGE_COST = "LEFT_EXCHANGE_COST";
+    public static final String OP_RIGHT_EXCHANGE_COST = "RIGHT_EXCHANGE_COST";
 }
diff --git a/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/expressions/ConstantExpression.java b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/expressions/ConstantExpression.java
index 6f0cbba..7f7f65f 100644
--- a/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/expressions/ConstantExpression.java
+++ b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/expressions/ConstantExpression.java
@@ -16,6 +16,7 @@
  * specific language governing permissions and limitations
  * under the License.
  */
+
 package org.apache.hyracks.algebricks.core.algebra.expressions;
 
 import java.util.Collection;
diff --git a/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/expressions/HashJoinExpressionAnnotation.java b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/expressions/HashJoinExpressionAnnotation.java
new file mode 100644
index 0000000..02ba2db
--- /dev/null
+++ b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/expressions/HashJoinExpressionAnnotation.java
@@ -0,0 +1,39 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.hyracks.algebricks.core.algebra.expressions;
+
+import java.util.Objects;
+
+public class HashJoinExpressionAnnotation implements IExpressionAnnotation {
+    public enum BuildSide {
+        LEFT,
+        RIGHT
+    }
+
+    private final BuildSide side;
+
+    public HashJoinExpressionAnnotation(BuildSide side) {
+        this.side = Objects.requireNonNull(side);
+    }
+
+    public BuildSide getBuildSide() {
+        return side;
+    }
+}
\ No newline at end of file
diff --git a/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/expressions/JoinProductivityAnnotation.java b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/expressions/JoinProductivityAnnotation.java
new file mode 100644
index 0000000..0191b85
--- /dev/null
+++ b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/expressions/JoinProductivityAnnotation.java
@@ -0,0 +1,39 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.hyracks.algebricks.core.algebra.expressions;
+
+public class JoinProductivityAnnotation implements IExpressionAnnotation {
+
+    private final double productivity;
+    private final String leftSideDataSet;
+
+    public JoinProductivityAnnotation(double productivity, String leftSideDataSet) {
+        this.productivity = productivity;
+        this.leftSideDataSet = leftSideDataSet;
+    }
+
+    public double getJoinProductivity() {
+        return productivity;
+    }
+
+    public String getLeftSideDataSet() {
+        return leftSideDataSet;
+    }
+}
\ No newline at end of file
diff --git a/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/expressions/PredicateCardinalityAnnotation.java b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/expressions/PredicateCardinalityAnnotation.java
new file mode 100644
index 0000000..e172449
--- /dev/null
+++ b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/expressions/PredicateCardinalityAnnotation.java
@@ -0,0 +1,33 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.hyracks.algebricks.core.algebra.expressions;
+
+public class PredicateCardinalityAnnotation implements IExpressionAnnotation {
+
+    private final double selectivity;
+
+    public PredicateCardinalityAnnotation(double selectivity) {
+        this.selectivity = selectivity;
+    }
+
+    public double getSelectivity() {
+        return selectivity;
+    }
+}
diff --git a/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/operators/logical/AbstractDataSourceOperator.java b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/operators/logical/AbstractDataSourceOperator.java
index 7d262a8..12a0572 100644
--- a/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/operators/logical/AbstractDataSourceOperator.java
+++ b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/operators/logical/AbstractDataSourceOperator.java
@@ -35,4 +35,8 @@
     public IDataSource<?> getDataSource() {
         return dataSource;
     }
+
+    public void setDataSource(IDataSource<?> datasource) {
+        this.dataSource = datasource;
+    }
 }
diff --git a/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/prettyprint/LogicalOperatorPrettyPrintVisitorJson.java b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/prettyprint/LogicalOperatorPrettyPrintVisitorJson.java
index 2728e46..64aa2e0 100644
--- a/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/prettyprint/LogicalOperatorPrettyPrintVisitorJson.java
+++ b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/prettyprint/LogicalOperatorPrettyPrintVisitorJson.java
@@ -33,7 +33,9 @@
 import org.apache.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import org.apache.hyracks.algebricks.core.algebra.base.ILogicalPlan;
 import org.apache.hyracks.algebricks.core.algebra.base.IPhysicalOperator;
+import org.apache.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import org.apache.hyracks.algebricks.core.algebra.base.LogicalVariable;
+import org.apache.hyracks.algebricks.core.algebra.base.OperatorAnnotations;
 import org.apache.hyracks.algebricks.core.algebra.expressions.IAlgebricksConstantValue;
 import org.apache.hyracks.algebricks.core.algebra.metadata.IProjectionInfo;
 import org.apache.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator;
@@ -96,6 +98,8 @@
     private static final String EXPRESSION_FIELD = "expression";
     private static final String CONDITION_FIELD = "condition";
     private static final String MISSING_VALUE_FIELD = "missing-value";
+    private static final String OP_CARDINALITY = "cardinality";
+    private static final String OP_COST = "cost";
 
     private final Map<AbstractLogicalOperator, String> operatorIdentity = new HashMap<>();
     private final IdCounter idCounter = new IdCounter();
@@ -196,6 +200,33 @@
                 jsonGenerator.writeStringField("physical-operator", pOp.toString(false));
             }
             jsonGenerator.writeStringField("execution-mode", op.getExecutionMode().toString());
+
+            for (Map.Entry<String, Object> anno : op.getAnnotations().entrySet()) {
+                Object annotationVal = anno.getValue();
+                if (annotationVal != null) {
+                    String annotation = anno.getKey();
+                    switch (annotation) {
+                        case OperatorAnnotations.OP_COST_LOCAL:
+                        case OperatorAnnotations.OP_COST_TOTAL:
+                            jsonGenerator.writeStringField(annotation.toLowerCase().replace('_', '-'),
+                                    annotationVal.toString());
+                            break;
+                        case OperatorAnnotations.OP_INPUT_CARDINALITY:
+                            if (op.getOperatorTag() == LogicalOperatorTag.DATASOURCESCAN) {
+                                jsonGenerator.writeStringField(OP_CARDINALITY, annotationVal.toString());
+                            }
+                            break;
+                        case OperatorAnnotations.OP_OUTPUT_CARDINALITY:
+                            if (op.getOperatorTag() != LogicalOperatorTag.DATASOURCESCAN) {
+                                jsonGenerator.writeStringField(OP_CARDINALITY, annotationVal.toString());
+                            }
+                            break;
+                        default:
+                            break;
+                    }
+                }
+            }
+
             if (printInputs && !op.getInputs().isEmpty()) {
                 jsonGenerator.writeArrayFieldStart("inputs");
                 for (Mutable<ILogicalOperator> k : op.getInputs()) {
@@ -884,13 +915,17 @@
 
     /////////////// string fields ///////////////
 
-    /** Writes "fieldName": "expr" */
+    /**
+     * Writes "fieldName": "expr"
+     */
     private void writeStringFieldExpression(String fieldName, Mutable<ILogicalExpression> expressionRef, Void indent)
             throws AlgebricksException, IOException {
         writeStringFieldExpression(fieldName, expressionRef.getValue(), indent);
     }
 
-    /** Writes "fieldName": "expr" */
+    /**
+     * Writes "fieldName": "expr"
+     */
     private void writeStringFieldExpression(String fieldName, ILogicalExpression expression, Void indent)
             throws AlgebricksException, IOException {
         jsonGenerator.writeStringField(fieldName, expression.accept(exprVisitor, indent));
@@ -898,7 +933,9 @@
 
     /////////////// array fields ///////////////
 
-    /** Writes "fieldName": [ "var1", "var2", ... ] */
+    /**
+     * Writes "fieldName": [ "var1", "var2", ... ]
+     */
     private void writeArrayFieldOfVariables(String fieldName, List<LogicalVariable> variables) throws IOException {
         jsonGenerator.writeArrayFieldStart(fieldName);
         for (int i = 0, size = variables.size(); i < size; i++) {
@@ -907,7 +944,9 @@
         jsonGenerator.writeEndArray();
     }
 
-    /** Writes "fieldName": [ ["var1", "var2", ...], ["var1", "var2", ...] ] */
+    /**
+     * Writes "fieldName": [ ["var1", "var2", ...], ["var1", "var2", ...] ]
+     */
     private void writeArrayFieldOfNestedVariablesList(String fieldName, List<List<LogicalVariable>> nestedVarList)
             throws IOException {
         jsonGenerator.writeArrayFieldStart(fieldName);
@@ -920,7 +959,9 @@
         jsonGenerator.writeEndArray();
     }
 
-    /** Writes "fieldName" : [ "expr" ] */
+    /**
+     * Writes "fieldName" : [ "expr" ]
+     */
     private void writeArrayFieldOfExpression(String fieldName, Mutable<ILogicalExpression> expr, Void indent)
             throws IOException, AlgebricksException {
         jsonGenerator.writeArrayFieldStart(fieldName);
@@ -928,7 +969,9 @@
         jsonGenerator.writeEndArray();
     }
 
-    /** Writes "fieldName" : [ "expr1", "expr2", ...] */
+    /**
+     * Writes "fieldName" : [ "expr1", "expr2", ...]
+     */
     private void writeArrayFieldOfExpressions(String fieldName, List<Mutable<ILogicalExpression>> exprs, Void indent)
             throws IOException, AlgebricksException {
         jsonGenerator.writeArrayFieldStart(fieldName);
@@ -938,7 +981,9 @@
         jsonGenerator.writeEndArray();
     }
 
-    /** Writes "fieldName" : [ { "variable": "var1", "expression": "expr1" }, ... ] */
+    /**
+     * Writes "fieldName" : [ { "variable": "var1", "expression": "expr1" }, ... ]
+     */
     private void writeArrayFieldOfVariableExpressionPairs(String fieldName,
             List<Pair<LogicalVariable, Mutable<ILogicalExpression>>> varExprPairs, Void indent)
             throws AlgebricksException, IOException {
@@ -954,7 +999,9 @@
         jsonGenerator.writeEndArray();
     }
 
-    /** Writes "fieldName" : [ { "order": "", "expression": "" }, ... ] */
+    /**
+     * Writes "fieldName" : [ { "order": "", "expression": "" }, ... ]
+     */
     private void writeArrayFieldOfOrderExprList(String fieldName,
             List<Pair<OrderOperator.IOrder, Mutable<ILogicalExpression>>> orderList, Void indent)
             throws AlgebricksException, IOException {
@@ -970,7 +1017,9 @@
 
     /////////////// object fields ///////////////
 
-    /** Writes "fieldName" : { "expressions": [ "expr1", "expr2", ...] } */
+    /**
+     * Writes "fieldName" : { "expressions": [ "expr1", "expr2", ...] }
+     */
     private void writeObjectFieldWithExpressions(String fieldName, List<Mutable<ILogicalExpression>> exprs, Void indent)
             throws IOException, AlgebricksException {
         jsonGenerator.writeObjectFieldStart(fieldName);
@@ -980,7 +1029,9 @@
 
     /////////////// other fields ///////////////
 
-    /** Writes "fieldName": null */
+    /**
+     * Writes "fieldName": null
+     */
     private void writeNullField(String fieldName) throws IOException {
         jsonGenerator.writeNullField(fieldName);
     }
diff --git a/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/util/OperatorManipulationUtil.java b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/util/OperatorManipulationUtil.java
index 26be09c..3e8a95f 100644
--- a/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/util/OperatorManipulationUtil.java
+++ b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/util/OperatorManipulationUtil.java
@@ -37,8 +37,10 @@
 import org.apache.hyracks.algebricks.core.algebra.base.ILogicalOperator;
 import org.apache.hyracks.algebricks.core.algebra.base.ILogicalPlan;
 import org.apache.hyracks.algebricks.core.algebra.base.IOptimizationContext;
+import org.apache.hyracks.algebricks.core.algebra.base.LogicalExpressionTag;
 import org.apache.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import org.apache.hyracks.algebricks.core.algebra.base.LogicalVariable;
+import org.apache.hyracks.algebricks.core.algebra.expressions.AbstractFunctionCallExpression;
 import org.apache.hyracks.algebricks.core.algebra.expressions.VariableReferenceExpression;
 import org.apache.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator;
 import org.apache.hyracks.algebricks.core.algebra.operators.logical.AbstractOperatorWithNestedPlans;
@@ -305,10 +307,8 @@
     /**
      * Compute type environment of a newly generated operator {@code op} and its input.
      *
-     * @param op,
-     *            the logical operator.
-     * @param context,the
-     *            optimization context.
+     * @param op,         the logical operator.
+     * @param context,the optimization context.
      * @throws AlgebricksException
      */
     public static void computeTypeEnvironmentBottomUp(ILogicalOperator op, ITypingContext context)
@@ -330,10 +330,8 @@
     /**
      * Computes the type environment for a logical query plan.
      *
-     * @param plan,
-     *            the logical plan to consider.
-     * @param context
-     *            the typing context.
+     * @param plan,   the logical plan to consider.
+     * @param context the typing context.
      * @throws AlgebricksException
      */
     public static void computeTypeEnvironment(ILogicalPlan plan, ITypingContext context) throws AlgebricksException {
@@ -402,8 +400,8 @@
     /**
      * Find an item a given list
      *
-     * @param list list to search in
-     * @param predicate predicate to test
+     * @param list           list to search in
+     * @param predicate      predicate to test
      * @param predicateParam parameter to pass to the predicate
      * @return item position in the given list or {@code -1} if not found
      */
@@ -445,9 +443,10 @@
     /**
      * Finds a variable assigned to a given expression and returns a new {@link VariableReferenceExpression}
      * referring to this variable.
-     * @param assignVarList list of variables
+     *
+     * @param assignVarList  list of variables
      * @param assignExprList list of expressions assigned to those variables
-     * @param searchExpr expression to search for
+     * @param searchExpr     expression to search for
      * @return said value, {@code null} if a variable is not found
      */
     public static VariableReferenceExpression findAssignedVariable(List<LogicalVariable> assignVarList,
@@ -509,4 +508,18 @@
             outVarRefList.add(new MutableObject<>(varRef));
         }
     }
+
+    public static void replaceVarWithExpr(AbstractFunctionCallExpression inExpr, LogicalVariable var,
+            ILogicalExpression replacementExpr) {
+        for (Mutable<ILogicalExpression> arg : inExpr.getArguments()) {
+            if (arg.getValue().getExpressionTag() == LogicalExpressionTag.FUNCTION_CALL) {
+                replaceVarWithExpr((AbstractFunctionCallExpression) (arg.getValue()), var, replacementExpr);
+            } else if (arg.getValue().getExpressionTag() == LogicalExpressionTag.VARIABLE) {
+                LogicalVariable v = ((VariableReferenceExpression) arg.getValue()).getVariableReference();
+                if (v.equals(var)) {
+                    arg.setValue(replacementExpr.cloneExpression());
+                }
+            }
+        }
+    }
 }
diff --git a/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/config/AlgebricksConfig.java b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/config/AlgebricksConfig.java
index b626ae6..c94d72a 100644
--- a/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/config/AlgebricksConfig.java
+++ b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/config/AlgebricksConfig.java
@@ -35,6 +35,13 @@
     public static final boolean SUBPLAN_NESTEDPUSHDOWN_DEFAULT = true;
     public static final boolean MIN_MEMORY_ALLOCATION_DEFAULT = true;
     public static final boolean ARRAY_INDEX_DEFAULT = true;
+    public static final boolean CBO_DEFAULT = true;
+    public static final boolean CBO_TEST_DEFAULT = false;
+    public static final boolean FORCE_JOIN_ORDER_DEFAULT = false;
+    public static final String QUERY_PLAN_SHAPE_ZIGZAG = "zigzag";
+    public static final String QUERY_PLAN_SHAPE_LEFTDEEP = "leftdeep";
+    public static final String QUERY_PLAN_SHAPE_RIGHTDEEP = "rightdeep";
+    public static final String QUERY_PLAN_SHAPE_DEFAULT = QUERY_PLAN_SHAPE_ZIGZAG;
     public static final int EXTERNAL_SCAN_BUFFER_SIZE =
             StorageUtil.getIntSizeInBytes(8, StorageUtil.StorageUnit.KILOBYTE);
     public static final boolean BATCH_LOOKUP_DEFAULT = false;
diff --git a/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/rewriter/base/CardHints.java b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/rewriter/base/CardHints.java
new file mode 100644
index 0000000..d1cb794
--- /dev/null
+++ b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/rewriter/base/CardHints.java
@@ -0,0 +1,175 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.hyracks.algebricks.core.rewriter.base;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class CardHints {
+
+    private static final double MAX_CARD = 1.0e200;
+
+    private List<List<String>> listRefNames;
+    private List<Double> cards;
+    private List<Double> sels;
+    private List<Double> sizes;
+
+    public CardHints() {
+        listRefNames = new ArrayList<>();
+        cards = new ArrayList<>();
+        sels = new ArrayList<>();
+        sizes = new ArrayList<>();
+    }
+
+    public void setCardInfo(List<List<String>> names, List<Double> c, List<Double> s, List<Double> si) {
+        listRefNames = names;
+        cards = c;
+        sels = s;
+        sizes = si;
+    }
+
+    public List<List<String>> getListRefNames() {
+        return listRefNames;
+    }
+
+    public List<Double> getCards() {
+        return cards;
+    }
+
+    public List<Double> getSels() {
+        return sels;
+    }
+
+    public List<Double> getSizes() {
+        return sizes;
+    }
+
+    public static List<String> isolateVariables(List<String> varsLogical) { // comes from the FromList
+        Pattern var = Pattern.compile("\\D\\w*");
+
+        List<String> vars = new ArrayList<>();
+
+        for (String vl : varsLogical) {
+            Matcher mat = var.matcher(vl.toString());
+            if (mat.find()) {
+                vars.add(mat.group());
+            }
+        }
+        Collections.sort(vars);
+        return vars;
+    }
+
+    public double findCardinality(List<String> vars) {
+        double card = MAX_CARD; // default value is set to high if no hint information is available
+        int i = 0;
+        for (List<String> refnames : this.getListRefNames()) {
+            if (refnames.equals(vars))
+            //return this.getCards().get(i) * this.getSels().get(i);
+            {
+                return this.getCards().get(i); // we want the original cardinality without any selections
+            }
+            i++;
+        }
+        return card;
+    }
+
+    public double findSize(List<String> vars) {
+        int i = 0;
+        for (List<String> refnames : this.getListRefNames()) {
+            if (refnames.equals(vars)) {
+                return this.getSizes().get(i);
+            }
+            i++;
+        }
+        return MAX_CARD;
+    }
+
+    // This routine should not be invoked anymore as we are only providing base hints.
+    // But in the event a user does specify mutiple table cards, then this routine will be invoked. Check!
+    public double findCardinality(List<String> varsL, List<String> varsR) {
+        varsL.addAll(varsR);
+        Collections.sort(varsL);
+        return this.findCardinality(varsL);
+    }
+
+    public static CardHints getCardHintsInfo(String hintParams) {
+        Pattern var = Pattern.compile("[a-zA-Z]\\w*"); // any word character [a-zA-Z_0-9]
+
+        Pattern number = Pattern.compile("\\d+\\.\\d+");
+
+        Pattern singleHintPattern =
+                Pattern.compile("\\(\\s*\\w+[\\s+\\w+\\s*]*\\s+\\d+\\.\\d+\\s+\\d+\\.\\d+\\s+\\d+\\.\\d+\\s*\\)");
+
+        // The above pattern is (id1 id2 ... idn first number second number third number)
+        // (o 400.0 0.5) or (o l s 4000.0 0.025) etc
+        // Note that the 2nd number which is selectivity is not optional. It can always be set to 1.0.
+        List<List<String>> listRefNames = new ArrayList<>();
+        List<Double> cards = new ArrayList<>();
+        List<Double> sels = new ArrayList<>();
+        List<Double> sizes = new ArrayList<>();
+        CardHints cardinalityHints = new CardHints();
+        if (hintParams != null) {
+            Matcher matCHP = singleHintPattern.matcher(hintParams);
+
+            while (matCHP.find()) {
+                List<String> refNames = new ArrayList<>();
+                Double selectivity = 1.0;
+                Double cardinality = -1.0;
+                Double size = 1.0;
+                String matchedGroup = matCHP.group();
+                Matcher matVar = var.matcher(matchedGroup);
+                Matcher numMat = number.matcher(matchedGroup);
+
+                while (matVar.find()) {
+                    refNames.add(matVar.group()); // find all the ids first
+                }
+
+                int i = 0;
+                while (numMat.find()) {
+                    i++;
+                    switch (i) {
+                        case 1:
+                            cardinality = Double.parseDouble(numMat.group());
+                            break;
+                        case 2:
+                            selectivity = Double.parseDouble(numMat.group());
+                        case 3:
+                            size = Double.parseDouble(numMat.group());
+                        default: // add error checking here.
+                            ;
+                    }
+                }
+                Collections.sort(refNames);
+                listRefNames.add(refNames);
+                cards.add(cardinality);
+                sels.add(selectivity);
+                sizes.add(size);
+
+                cardinalityHints.setCardInfo(listRefNames, cards, sels, sizes);
+            }
+
+            return cardinalityHints;
+        }
+        return null; // keeps compiler happy.
+    }
+}
\ No newline at end of file
diff --git a/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/rewriter/base/HeuristicOptimizer.java b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/rewriter/base/HeuristicOptimizer.java
index f93d1f9..a717295 100644
--- a/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/rewriter/base/HeuristicOptimizer.java
+++ b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/rewriter/base/HeuristicOptimizer.java
@@ -61,6 +61,7 @@
         logPlanAt("Plan Before Optimization", Level.TRACE);
         sanityCheckBeforeOptimization(plan);
         runLogicalOptimizationSets(plan, logicalRewrites);
+        logPlanAt("LogicalPlan ", Level.TRACE);
         computeSchemaBottomUpForPlan(plan);
         runPhysicalOptimizationSets(plan, physicalRewrites);
         logPlanAt("Plan After Optimization", Level.TRACE);
diff --git a/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/rewriter/base/PhysicalOptimizationConfig.java b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/rewriter/base/PhysicalOptimizationConfig.java
index 4d54a10..86be6d0 100644
--- a/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/rewriter/base/PhysicalOptimizationConfig.java
+++ b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/rewriter/base/PhysicalOptimizationConfig.java
@@ -48,6 +48,10 @@
     private static final String ARRAY_INDEX = "ARRAY_INDEX";
     private static final String EXTERNAL_SCAN_BUFFER_SIZE = "EXTERNAL_SCAN_BUFFER_SIZE";
     private static final String BATCH_LOOKUP = "BATCH_LOOKUP";
+    private static final String CBO = "CBO";
+    private static final String CBO_TEST = "CBO_TEST";
+    private static final String FORCE_JOIN_ORDER = "FORCE_JOIN_ORDER";
+    private static final String QUERY_PLAN_SHAPE = "QUERY_PLAN_SHAPE";
 
     private final Properties properties = new Properties();
 
@@ -240,6 +244,44 @@
         return getInt(EXTERNAL_SCAN_BUFFER_SIZE, AlgebricksConfig.EXTERNAL_SCAN_BUFFER_SIZE);
     }
 
+    public boolean getCBOMode() {
+        return getBoolean(CBO, AlgebricksConfig.CBO_DEFAULT);
+    }
+
+    public boolean getCBOTestMode() {
+        return getBoolean(CBO_TEST, AlgebricksConfig.CBO_TEST_DEFAULT);
+    }
+
+    public boolean getForceJoinOrderMode() {
+        return getBoolean(FORCE_JOIN_ORDER, AlgebricksConfig.FORCE_JOIN_ORDER_DEFAULT);
+    }
+
+    public String getQueryPlanShapeMode() {
+        String queryPlanShapeMode = getString(QUERY_PLAN_SHAPE, AlgebricksConfig.QUERY_PLAN_SHAPE_DEFAULT);
+        if (!(queryPlanShapeMode.equals(AlgebricksConfig.QUERY_PLAN_SHAPE_ZIGZAG)
+                || queryPlanShapeMode.equals(AlgebricksConfig.QUERY_PLAN_SHAPE_LEFTDEEP)
+                || queryPlanShapeMode.equals(AlgebricksConfig.QUERY_PLAN_SHAPE_RIGHTDEEP))) {
+            return AlgebricksConfig.QUERY_PLAN_SHAPE_DEFAULT;
+        }
+        return queryPlanShapeMode;
+    }
+
+    public void setCBOMode(boolean cbo) {
+        setBoolean(CBO, cbo);
+    }
+
+    public void setCBOTestMode(boolean cboTest) {
+        setBoolean(CBO_TEST, cboTest);
+    }
+
+    public void setForceJoinOrderMode(boolean forceJoinOrder) {
+        setBoolean(FORCE_JOIN_ORDER, forceJoinOrder);
+    }
+
+    public void setQueryPlanShapeMode(String queryPlanShape) {
+        setString(QUERY_PLAN_SHAPE, queryPlanShape);
+    }
+
     public boolean isBatchLookupEnabled() {
         return getBoolean(BATCH_LOOKUP, AlgebricksConfig.BATCH_LOOKUP_DEFAULT);
     }
@@ -278,4 +320,13 @@
         String value = properties.getProperty(property);
         return value == null ? defaultValue : Boolean.parseBoolean(value);
     }
+
+    private void setString(String property, String value) {
+        properties.setProperty(property, value);
+    }
+
+    private String getString(String property, String defaultValue) {
+        String value = properties.getProperty(property);
+        return value == null ? defaultValue : value;
+    }
 }