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From ima...@apache.org
Subject [29/51] [partial] incubator-asterixdb-hyracks git commit: Change folder structure for Java repackage
Date Tue, 25 Aug 2015 16:41:42 GMT
http://git-wip-us.apache.org/repos/asf/incubator-asterixdb-hyracks/blob/9939b48e/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/operators/logical/visitors/IsomorphismVariableMappingVisitor.java
----------------------------------------------------------------------
diff --git a/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/operators/logical/visitors/IsomorphismVariableMappingVisitor.java b/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/operators/logical/visitors/IsomorphismVariableMappingVisitor.java
new file mode 100644
index 0000000..99df45c
--- /dev/null
+++ b/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/operators/logical/visitors/IsomorphismVariableMappingVisitor.java
@@ -0,0 +1,447 @@
+/*
+ * Copyright 2009-2013 by The Regents of the University of California
+ * Licensed 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 from
+ * 
+ *     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 edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.visitors;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+
+import org.apache.commons.lang3.mutable.Mutable;
+import org.apache.commons.lang3.mutable.MutableObject;
+
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.common.utils.Triple;
+import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
+import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
+import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
+import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.AbstractLogicalExpression;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractAssignOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractOperatorWithNestedPlans;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AggregateOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AssignOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.DataSourceScanOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.DistinctOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.DistributeResultOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.EmptyTupleSourceOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ExchangeOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ExtensionOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ExternalDataLookupOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.GroupByOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IndexInsertDeleteOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.InnerJoinOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.InsertDeleteOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.LeftOuterJoinOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.LimitOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.MaterializeOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.NestedTupleSourceOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.OrderOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.PartitioningSplitOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ProjectOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ReplicateOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.RunningAggregateOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ScriptOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SelectOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SinkOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SubplanOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.TokenizeOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.UnionAllOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.UnnestMapOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.UnnestOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.WriteOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.WriteResultOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
+
+public class IsomorphismVariableMappingVisitor implements ILogicalOperatorVisitor<Void, ILogicalOperator> {
+
+    private Map<LogicalVariable, LogicalVariable> variableMapping;
+
+    public IsomorphismVariableMappingVisitor(Map<LogicalVariable, LogicalVariable> variableMapping) {
+        this.variableMapping = variableMapping;
+    }
+
+    @Override
+    public Void visitAggregateOperator(AggregateOperator op, ILogicalOperator arg) throws AlgebricksException {
+        mapChildren(op, arg);
+        mapVariablesForAbstractAssign(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitRunningAggregateOperator(RunningAggregateOperator op, ILogicalOperator arg)
+            throws AlgebricksException {
+        mapChildren(op, arg);
+        mapVariablesForAbstractAssign(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitEmptyTupleSourceOperator(EmptyTupleSourceOperator op, ILogicalOperator arg)
+            throws AlgebricksException {
+        mapVariablesStandard(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitGroupByOperator(GroupByOperator op, ILogicalOperator arg) throws AlgebricksException {
+        mapChildren(op, arg);
+        mapVariablesForGroupBy(op, arg);
+        mapVariablesInNestedPlans(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitLimitOperator(LimitOperator op, ILogicalOperator arg) throws AlgebricksException {
+        mapVariablesStandard(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitInnerJoinOperator(InnerJoinOperator op, ILogicalOperator arg) throws AlgebricksException {
+        mapVariablesStandard(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitLeftOuterJoinOperator(LeftOuterJoinOperator op, ILogicalOperator arg) throws AlgebricksException {
+        mapVariablesStandard(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitNestedTupleSourceOperator(NestedTupleSourceOperator op, ILogicalOperator arg)
+            throws AlgebricksException {
+        ILogicalOperator inputToCreator1 = op.getSourceOperator();
+        NestedTupleSourceOperator nts = (NestedTupleSourceOperator) arg;
+        ILogicalOperator inputToCreator2 = nts.getSourceOperator();
+        inputToCreator1.accept(this, inputToCreator2);
+        return null;
+    }
+
+    @Override
+    public Void visitOrderOperator(OrderOperator op, ILogicalOperator arg) throws AlgebricksException {
+        mapVariablesStandard(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitAssignOperator(AssignOperator op, ILogicalOperator arg) throws AlgebricksException {
+        mapChildren(op, arg);
+        mapVariablesForAbstractAssign(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitSelectOperator(SelectOperator op, ILogicalOperator arg) throws AlgebricksException {
+        mapVariablesStandard(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitProjectOperator(ProjectOperator op, ILogicalOperator arg) throws AlgebricksException {
+        mapVariablesStandard(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitPartitioningSplitOperator(PartitioningSplitOperator op, ILogicalOperator arg)
+            throws AlgebricksException {
+        mapVariablesStandard(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitReplicateOperator(ReplicateOperator op, ILogicalOperator arg) throws AlgebricksException {
+        mapVariablesStandard(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitMaterializeOperator(MaterializeOperator op, ILogicalOperator arg) throws AlgebricksException {
+        mapVariablesStandard(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitScriptOperator(ScriptOperator op, ILogicalOperator arg) throws AlgebricksException {
+        mapVariablesStandard(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitSubplanOperator(SubplanOperator op, ILogicalOperator arg) throws AlgebricksException {
+        mapChildren(op, arg);
+        mapVariablesInNestedPlans(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitUnionOperator(UnionAllOperator op, ILogicalOperator arg) throws AlgebricksException {
+        mapChildren(op, arg);
+        mapVariablesForUnion(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitUnnestOperator(UnnestOperator op, ILogicalOperator arg) throws AlgebricksException {
+        mapVariablesStandard(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitUnnestMapOperator(UnnestMapOperator op, ILogicalOperator arg) throws AlgebricksException {
+        mapVariablesStandard(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitDataScanOperator(DataSourceScanOperator op, ILogicalOperator arg) throws AlgebricksException {
+        mapVariablesStandard(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitDistinctOperator(DistinctOperator op, ILogicalOperator arg) throws AlgebricksException {
+        mapVariablesStandard(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitExchangeOperator(ExchangeOperator op, ILogicalOperator arg) throws AlgebricksException {
+        mapVariablesStandard(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitWriteOperator(WriteOperator op, ILogicalOperator arg) throws AlgebricksException {
+        mapVariablesStandard(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitDistributeResultOperator(DistributeResultOperator op, ILogicalOperator arg)
+            throws AlgebricksException {
+        mapVariablesStandard(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitWriteResultOperator(WriteResultOperator op, ILogicalOperator arg) throws AlgebricksException {
+        mapVariablesStandard(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitInsertDeleteOperator(InsertDeleteOperator op, ILogicalOperator arg) throws AlgebricksException {
+        mapVariablesStandard(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitIndexInsertDeleteOperator(IndexInsertDeleteOperator op, ILogicalOperator arg)
+            throws AlgebricksException {
+        mapVariablesStandard(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitTokenizeOperator(TokenizeOperator op, ILogicalOperator arg)
+            throws AlgebricksException {
+        mapVariablesStandard(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitSinkOperator(SinkOperator op, ILogicalOperator arg) throws AlgebricksException {
+        mapVariablesStandard(op, arg);
+        return null;
+    }
+
+    private void mapChildren(ILogicalOperator op, ILogicalOperator opArg) throws AlgebricksException {
+        List<Mutable<ILogicalOperator>> inputs = op.getInputs();
+        List<Mutable<ILogicalOperator>> inputsArg = opArg.getInputs();
+        if (inputs.size() != inputsArg.size())
+            throw new AlgebricksException("children are not isomoprhic");
+        for (int i = 0; i < inputs.size(); i++) {
+            ILogicalOperator input = inputs.get(i).getValue();
+            ILogicalOperator inputArg = inputsArg.get(i).getValue();
+            input.accept(this, inputArg);
+        }
+    }
+
+    private void mapVariables(ILogicalOperator left, ILogicalOperator right) throws AlgebricksException {
+        List<LogicalVariable> producedVarLeft = new ArrayList<LogicalVariable>();
+        List<LogicalVariable> producedVarRight = new ArrayList<LogicalVariable>();
+        VariableUtilities.getProducedVariables(left, producedVarLeft);
+        VariableUtilities.getProducedVariables(right, producedVarRight);
+        mapVariables(producedVarLeft, producedVarRight);
+    }
+
+    private void mapVariables(List<LogicalVariable> variablesLeft, List<LogicalVariable> variablesRight) {
+        if (variablesLeft.size() != variablesRight.size())
+            return;
+        int size = variablesLeft.size();
+        for (int i = 0; i < size; i++) {
+            LogicalVariable left = variablesLeft.get(i);
+            LogicalVariable right = variablesRight.get(i);
+            variableMapping.put(right, left);
+        }
+    }
+
+    private void mapVariablesForAbstractAssign(ILogicalOperator left, ILogicalOperator right)
+            throws AlgebricksException {
+        AbstractAssignOperator leftOp = (AbstractAssignOperator) left;
+        AbstractAssignOperator rightOp = (AbstractAssignOperator) right;
+        List<LogicalVariable> producedVarLeft = new ArrayList<LogicalVariable>();
+        List<LogicalVariable> producedVarRight = new ArrayList<LogicalVariable>();
+        VariableUtilities.getProducedVariables(left, producedVarLeft);
+        VariableUtilities.getProducedVariables(right, producedVarRight);
+        mapVariablesForAbstractAssign(producedVarLeft, leftOp.getExpressions(), producedVarRight,
+                rightOp.getExpressions());
+    }
+
+    private void mapVariablesForGroupBy(ILogicalOperator left, ILogicalOperator right) throws AlgebricksException {
+        GroupByOperator leftOp = (GroupByOperator) left;
+        GroupByOperator rightOp = (GroupByOperator) right;
+        List<Pair<LogicalVariable, Mutable<ILogicalExpression>>> leftPairs = leftOp.getGroupByList();
+        List<Pair<LogicalVariable, Mutable<ILogicalExpression>>> rightPairs = rightOp.getGroupByList();
+        mapVarExprPairList(leftPairs, rightPairs);
+        leftPairs = leftOp.getDecorList();
+        rightPairs = rightOp.getDecorList();
+        mapVarExprPairList(leftPairs, rightPairs);
+    }
+
+    private void mapVarExprPairList(List<Pair<LogicalVariable, Mutable<ILogicalExpression>>> leftPairs,
+            List<Pair<LogicalVariable, Mutable<ILogicalExpression>>> rightPairs) {
+        if (leftPairs.size() != rightPairs.size())
+            return;
+        for (int i = 0; i < leftPairs.size(); i++) {
+            ILogicalExpression exprLeft = leftPairs.get(i).second.getValue();
+            LogicalVariable leftVar = leftPairs.get(i).first;
+            for (int j = 0; j < leftPairs.size(); j++) {
+                ILogicalExpression exprRight = copyExpressionAndSubtituteVars(rightPairs.get(j).second).getValue();
+                if (exprLeft.equals(exprRight)) {
+                    LogicalVariable rightVar = rightPairs.get(j).first;
+                    if (rightVar != null && leftVar != null) {
+                        variableMapping.put(rightVar, leftVar);
+                    }
+                    break;
+                }
+            }
+        }
+    }
+
+    private void mapVariablesForAbstractAssign(List<LogicalVariable> variablesLeft,
+            List<Mutable<ILogicalExpression>> exprsLeft, List<LogicalVariable> variablesRight,
+            List<Mutable<ILogicalExpression>> exprsRight) {
+        if (variablesLeft.size() != variablesRight.size())
+            return;
+        int size = variablesLeft.size();
+        for (int i = 0; i < size; i++) {
+            ILogicalExpression exprLeft = exprsLeft.get(i).getValue();
+            LogicalVariable left = variablesLeft.get(i);
+            for (int j = 0; j < size; j++) {
+                ILogicalExpression exprRight = copyExpressionAndSubtituteVars(exprsRight.get(j)).getValue();
+                if (exprLeft.equals(exprRight)) {
+                    LogicalVariable right = variablesRight.get(j);
+                    variableMapping.put(right, left);
+                    break;
+                }
+            }
+        }
+    }
+
+    private void mapVariablesInNestedPlans(ILogicalOperator opOrigin, ILogicalOperator arg) throws AlgebricksException {
+        AbstractOperatorWithNestedPlans op = (AbstractOperatorWithNestedPlans) opOrigin;
+        AbstractOperatorWithNestedPlans argOp = (AbstractOperatorWithNestedPlans) arg;
+        List<ILogicalPlan> plans = op.getNestedPlans();
+        List<ILogicalPlan> plansArg = argOp.getNestedPlans();
+        if (plans.size() != plansArg.size())
+            return;
+        for (int i = 0; i < plans.size(); i++) {
+            List<Mutable<ILogicalOperator>> roots = plans.get(i).getRoots();
+            List<Mutable<ILogicalOperator>> rootsArg = plansArg.get(i).getRoots();
+            if (roots.size() != rootsArg.size())
+                return;
+            for (int j = 0; j < roots.size(); j++) {
+                ILogicalOperator topOp1 = roots.get(j).getValue();
+                ILogicalOperator topOp2 = rootsArg.get(j).getValue();
+                topOp1.accept(this, topOp2);
+            }
+        }
+    }
+
+    private void mapVariablesStandard(ILogicalOperator op, ILogicalOperator arg) throws AlgebricksException {
+        mapChildren(op, arg);
+        mapVariables(op, arg);
+    }
+
+    private Mutable<ILogicalExpression> copyExpressionAndSubtituteVars(Mutable<ILogicalExpression> expr) {
+        ILogicalExpression copy = ((AbstractLogicalExpression) expr.getValue()).cloneExpression();
+        for (Entry<LogicalVariable, LogicalVariable> entry : variableMapping.entrySet())
+            copy.substituteVar(entry.getKey(), entry.getValue());
+        return new MutableObject<ILogicalExpression>(copy);
+    }
+
+    private void mapVariablesForUnion(ILogicalOperator op, ILogicalOperator arg) {
+        UnionAllOperator union = (UnionAllOperator) op;
+        UnionAllOperator unionArg = (UnionAllOperator) arg;
+        mapVarTripleList(union.getVariableMappings(), unionArg.getVariableMappings());
+    }
+
+    private void mapVarTripleList(List<Triple<LogicalVariable, LogicalVariable, LogicalVariable>> leftTriples,
+            List<Triple<LogicalVariable, LogicalVariable, LogicalVariable>> rightTriples) {
+        if (leftTriples.size() != rightTriples.size())
+            return;
+        for (int i = 0; i < leftTriples.size(); i++) {
+            LogicalVariable leftFirstVar = leftTriples.get(i).first;
+            LogicalVariable leftSecondVar = leftTriples.get(i).second;
+            LogicalVariable leftThirdVar = leftTriples.get(i).third;
+            for (int j = 0; j < rightTriples.size(); j++) {
+                LogicalVariable rightFirstVar = rightTriples.get(j).first;
+                LogicalVariable rightSecondVar = rightTriples.get(j).second;
+                LogicalVariable rightThirdVar = rightTriples.get(j).third;
+                if (varEquivalent(leftFirstVar, rightFirstVar) && varEquivalent(leftSecondVar, rightSecondVar)) {
+                    variableMapping.put(rightThirdVar, leftThirdVar);
+                    break;
+                }
+            }
+        }
+    }
+
+    private boolean varEquivalent(LogicalVariable left, LogicalVariable right) {
+        if (variableMapping.get(right) == null)
+            return false;
+        if (variableMapping.get(right).equals(left))
+            return true;
+        else
+            return false;
+    }
+
+    @Override
+    public Void visitExtensionOperator(ExtensionOperator op, ILogicalOperator arg) throws AlgebricksException {
+        mapVariablesStandard(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitExternalDataLookupOperator(ExternalDataLookupOperator op, ILogicalOperator arg)
+            throws AlgebricksException {
+        return null;
+    }
+
+}

http://git-wip-us.apache.org/repos/asf/incubator-asterixdb-hyracks/blob/9939b48e/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/operators/logical/visitors/LogicalPropertiesVisitor.java
----------------------------------------------------------------------
diff --git a/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/operators/logical/visitors/LogicalPropertiesVisitor.java b/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/operators/logical/visitors/LogicalPropertiesVisitor.java
new file mode 100644
index 0000000..19fcf65
--- /dev/null
+++ b/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/operators/logical/visitors/LogicalPropertiesVisitor.java
@@ -0,0 +1,350 @@
+/*
+ * Copyright 2009-2013 by The Regents of the University of California
+ * Licensed 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 from
+ *
+ *     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 edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.visitors;
+
+import org.apache.commons.lang3.mutable.Mutable;
+
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
+import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext;
+import edu.uci.ics.hyracks.algebricks.core.algebra.base.OperatorAnnotations;
+import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IExpressionEvalSizeComputer;
+import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableEvalSizeEnvironment;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractAssignOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AggregateOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AssignOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.DataSourceScanOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.DistinctOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.DistributeResultOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.EmptyTupleSourceOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ExchangeOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ExtensionOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ExternalDataLookupOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.GroupByOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IndexInsertDeleteOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.InnerJoinOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.InsertDeleteOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.LeftOuterJoinOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.LimitOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.MaterializeOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.NestedTupleSourceOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.OrderOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.PartitioningSplitOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ProjectOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ReplicateOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.RunningAggregateOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ScriptOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SelectOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SinkOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SubplanOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.TokenizeOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.UnionAllOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.UnnestMapOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.UnnestOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.WriteOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.WriteResultOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.properties.ILogicalPropertiesVector;
+import edu.uci.ics.hyracks.algebricks.core.algebra.properties.LogicalPropertiesVectorImpl;
+import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
+import edu.uci.ics.hyracks.algebricks.core.config.AlgebricksConfig;
+
+public class LogicalPropertiesVisitor implements ILogicalOperatorVisitor<Void, IOptimizationContext> {
+
+    public static void computeLogicalPropertiesDFS(ILogicalOperator op, IOptimizationContext context)
+            throws AlgebricksException {
+        LogicalPropertiesVisitor visitor = new LogicalPropertiesVisitor();
+        computeLogicalPropertiesRec(op, visitor, context);
+    }
+
+    private static void computeLogicalPropertiesRec(ILogicalOperator op, LogicalPropertiesVisitor visitor,
+            IOptimizationContext context) throws AlgebricksException {
+        for (Mutable<ILogicalOperator> ref : op.getInputs()) {
+            computeLogicalPropertiesRec(ref.getValue(), visitor, context);
+        }
+        op.accept(visitor, context);
+        if (AlgebricksConfig.DEBUG) {
+            AlgebricksConfig.ALGEBRICKS_LOGGER.finest("Logical properties visitor for " + op + ": "
+                    + context.getLogicalPropertiesVector(op) + "\n");
+        }
+    }
+
+    @Override
+    public Void visitAggregateOperator(AggregateOperator op, IOptimizationContext arg) throws AlgebricksException {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    public Void visitAssignOperator(AssignOperator op, IOptimizationContext context) throws AlgebricksException {
+        visitAssignment(op, context);
+        return null;
+    }
+
+    @Override
+    public Void visitDataScanOperator(DataSourceScanOperator op, IOptimizationContext arg) throws AlgebricksException {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    public Void visitDistinctOperator(DistinctOperator op, IOptimizationContext arg) throws AlgebricksException {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    public Void visitEmptyTupleSourceOperator(EmptyTupleSourceOperator op, IOptimizationContext arg)
+            throws AlgebricksException {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    public Void visitExchangeOperator(ExchangeOperator op, IOptimizationContext arg) throws AlgebricksException {
+        propagateCardinalityAndFrameNumber(op, arg);
+        return null;
+    }
+
+    @Override
+    public Void visitGroupByOperator(GroupByOperator op, IOptimizationContext arg) throws AlgebricksException {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    public Void visitInnerJoinOperator(InnerJoinOperator op, IOptimizationContext arg) throws AlgebricksException {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    public Void visitLeftOuterJoinOperator(LeftOuterJoinOperator op, IOptimizationContext arg)
+            throws AlgebricksException {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    public Void visitLimitOperator(LimitOperator op, IOptimizationContext arg) throws AlgebricksException {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    public Void visitNestedTupleSourceOperator(NestedTupleSourceOperator op, IOptimizationContext arg)
+            throws AlgebricksException {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    public Void visitOrderOperator(OrderOperator op, IOptimizationContext arg) throws AlgebricksException {
+        Object annot1 = op.getAnnotations().get(OperatorAnnotations.CARDINALITY);
+        if (annot1 == null) {
+            return null;
+        }
+        Integer m = (Integer) annot1;
+        LogicalPropertiesVectorImpl v = new LogicalPropertiesVectorImpl();
+        v.setNumberOfTuples(m);
+        Object annot2 = op.getAnnotations().get(OperatorAnnotations.MAX_NUMBER_FRAMES);
+        if (annot2 != null) {
+            Integer f = (Integer) annot2;
+            v.setMaxOutputFrames(f);
+        }
+        arg.putLogicalPropertiesVector(op, v);
+        return null;
+    }
+
+    @Override
+    public Void visitPartitioningSplitOperator(PartitioningSplitOperator op, IOptimizationContext arg)
+            throws AlgebricksException {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    public Void visitProjectOperator(ProjectOperator op, IOptimizationContext context) throws AlgebricksException {
+        propagateCardinalityAndFrameNumber(op, context);
+        return null;
+    }
+
+    @Override
+    public Void visitReplicateOperator(ReplicateOperator op, IOptimizationContext arg) throws AlgebricksException {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    public Void visitMaterializeOperator(MaterializeOperator op, IOptimizationContext arg) throws AlgebricksException {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    public Void visitRunningAggregateOperator(RunningAggregateOperator op, IOptimizationContext context)
+            throws AlgebricksException {
+        visitAssignment(op, context);
+        return null;
+    }
+
+    @Override
+    public Void visitScriptOperator(ScriptOperator op, IOptimizationContext arg) throws AlgebricksException {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    public Void visitSelectOperator(SelectOperator op, IOptimizationContext arg) throws AlgebricksException {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    public Void visitSubplanOperator(SubplanOperator op, IOptimizationContext arg) throws AlgebricksException {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    public Void visitUnionOperator(UnionAllOperator op, IOptimizationContext arg) throws AlgebricksException {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    public Void visitUnnestMapOperator(UnnestMapOperator op, IOptimizationContext arg) throws AlgebricksException {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    public Void visitUnnestOperator(UnnestOperator op, IOptimizationContext arg) throws AlgebricksException {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    public Void visitWriteOperator(WriteOperator op, IOptimizationContext arg) throws AlgebricksException {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    public Void visitDistributeResultOperator(DistributeResultOperator op, IOptimizationContext arg)
+            throws AlgebricksException {
+        return null;
+    }
+
+    @Override
+    public Void visitWriteResultOperator(WriteResultOperator op, IOptimizationContext arg) throws AlgebricksException {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    public Void visitInsertDeleteOperator(InsertDeleteOperator op, IOptimizationContext arg) throws AlgebricksException {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    public Void visitIndexInsertDeleteOperator(IndexInsertDeleteOperator op, IOptimizationContext arg)
+            throws AlgebricksException {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    public Void visitTokenizeOperator(TokenizeOperator op, IOptimizationContext arg)
+            throws AlgebricksException {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    public Void visitSinkOperator(SinkOperator op, IOptimizationContext arg) throws AlgebricksException {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    private LogicalPropertiesVectorImpl propagateCardinality(ILogicalOperator op, IOptimizationContext context) {
+        ILogicalOperator op0 = op.getInputs().get(0).getValue();
+        ILogicalPropertiesVector v0 = context.getLogicalPropertiesVector(op0);
+        if (v0 == null) {
+            return null;
+        }
+        LogicalPropertiesVectorImpl v = new LogicalPropertiesVectorImpl();
+        v.setNumberOfTuples(v0.getNumberOfTuples());
+        context.putLogicalPropertiesVector(op, v);
+        return v;
+    }
+
+    private void visitAssignment(AbstractAssignOperator op, IOptimizationContext context) throws AlgebricksException {
+        LogicalPropertiesVectorImpl v = propagateCardinality(op, context);
+        if (v != null && v.getNumberOfTuples() != null) {
+            IVariableEvalSizeEnvironment varSizeEnv = context.getVariableEvalSizeEnvironment();
+            IExpressionEvalSizeComputer evalSize = context.getExpressionEvalSizeComputer();
+            if (evalSize != null) {
+                ILogicalOperator op0 = op.getInputs().get(0).getValue();
+                ILogicalPropertiesVector v0 = context.getLogicalPropertiesVector(op0);
+                if (v0 != null) {
+                    long frames0 = v0.getMaxOutputFrames();
+                    long overhead = 0; // added per tuple
+                    for (Mutable<ILogicalExpression> exprRef : op.getExpressions()) {
+                        int sz = evalSize.getEvalSize(exprRef.getValue(), varSizeEnv);
+                        if (sz == -1) {
+                            return;
+                        }
+                        overhead += sz;
+                    }
+                    int frameSize = context.getPhysicalOptimizationConfig().getFrameSize();
+                    if (frameSize > 0) {
+                        long sz = frames0 * frameSize + overhead * v.getNumberOfTuples();
+                        int frames1 = (int) (sz / frameSize);
+                        if (sz % frameSize > 0) {
+                            frames1++;
+                        }
+                        v.setMaxOutputFrames(frames1);
+                    }
+                }
+            }
+        }
+    }
+
+    public void propagateCardinalityAndFrameNumber(ILogicalOperator op, IOptimizationContext context)
+            throws AlgebricksException {
+        LogicalPropertiesVectorImpl v = propagateCardinality(op, context);
+        // propagate also max number of frames (conservatively)
+        ILogicalOperator op0 = op.getInputs().get(0).getValue();
+        ILogicalPropertiesVector v0 = context.getLogicalPropertiesVector(op0);
+        if (v0 != null) {
+            v.setMaxOutputFrames(v0.getMaxOutputFrames());
+        }
+    }
+
+    @Override
+    public Void visitExtensionOperator(ExtensionOperator op, IOptimizationContext arg) throws AlgebricksException {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+    @Override
+    public Void visitExternalDataLookupOperator(ExternalDataLookupOperator op, IOptimizationContext arg)
+            throws AlgebricksException {
+        return null;
+    }
+
+}

http://git-wip-us.apache.org/repos/asf/incubator-asterixdb-hyracks/blob/9939b48e/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/operators/logical/visitors/OperatorDeepCopyVisitor.java
----------------------------------------------------------------------
diff --git a/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/operators/logical/visitors/OperatorDeepCopyVisitor.java b/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/operators/logical/visitors/OperatorDeepCopyVisitor.java
new file mode 100644
index 0000000..e62dbf8
--- /dev/null
+++ b/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/operators/logical/visitors/OperatorDeepCopyVisitor.java
@@ -0,0 +1,368 @@
+/*
+ * Copyright 2009-2013 by The Regents of the University of California
+ * Licensed 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 from
+ * 
+ *     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 edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.visitors;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.commons.lang3.mutable.Mutable;
+import org.apache.commons.lang3.mutable.MutableObject;
+
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.common.utils.Triple;
+import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
+import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
+import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
+import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.AbstractLogicalExpression;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AggregateOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AssignOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.DataSourceScanOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.DistinctOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.DistributeResultOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.EmptyTupleSourceOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ExchangeOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ExtensionOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ExternalDataLookupOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.GroupByOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IndexInsertDeleteOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.InnerJoinOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.InsertDeleteOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.LeftOuterJoinOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.LimitOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.MaterializeOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.NestedTupleSourceOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.OrderOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.OrderOperator.IOrder;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.PartitioningSplitOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ProjectOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ReplicateOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.RunningAggregateOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ScriptOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SelectOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SinkOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SubplanOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.TokenizeOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.UnionAllOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.UnnestMapOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.UnnestOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.WriteOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.WriteResultOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.util.OperatorManipulationUtil;
+import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
+
+public class OperatorDeepCopyVisitor implements ILogicalOperatorVisitor<ILogicalOperator, Void> {
+
+    @Override
+    public ILogicalOperator visitAggregateOperator(AggregateOperator op, Void arg) throws AlgebricksException {
+        ArrayList<LogicalVariable> newList = new ArrayList<LogicalVariable>();
+        ArrayList<Mutable<ILogicalExpression>> newExpressions = new ArrayList<Mutable<ILogicalExpression>>();
+        newList.addAll(op.getVariables());
+        deepCopyExpressionRefs(newExpressions, op.getExpressions());
+        return new AggregateOperator(newList, newExpressions);
+    }
+
+    @Override
+    public ILogicalOperator visitRunningAggregateOperator(RunningAggregateOperator op, Void arg)
+            throws AlgebricksException {
+        ArrayList<LogicalVariable> newList = new ArrayList<LogicalVariable>();
+        ArrayList<Mutable<ILogicalExpression>> newExpressions = new ArrayList<Mutable<ILogicalExpression>>();
+        newList.addAll(op.getVariables());
+        deepCopyExpressionRefs(newExpressions, op.getExpressions());
+        return new RunningAggregateOperator(newList, newExpressions);
+    }
+
+    @Override
+    public ILogicalOperator visitEmptyTupleSourceOperator(EmptyTupleSourceOperator op, Void arg)
+            throws AlgebricksException {
+        return new EmptyTupleSourceOperator();
+    }
+
+    @Override
+    public ILogicalOperator visitGroupByOperator(GroupByOperator op, Void arg) throws AlgebricksException {
+        List<Pair<LogicalVariable, Mutable<ILogicalExpression>>> groupByList = new ArrayList<Pair<LogicalVariable, Mutable<ILogicalExpression>>>();
+        List<Pair<LogicalVariable, Mutable<ILogicalExpression>>> decoList = new ArrayList<Pair<LogicalVariable, Mutable<ILogicalExpression>>>();
+        ArrayList<ILogicalPlan> newSubplans = new ArrayList<ILogicalPlan>();
+        for (Pair<LogicalVariable, Mutable<ILogicalExpression>> pair : op.getGroupByList())
+            groupByList.add(new Pair<LogicalVariable, Mutable<ILogicalExpression>>(pair.first,
+                    deepCopyExpressionRef(pair.second)));
+        for (Pair<LogicalVariable, Mutable<ILogicalExpression>> pair : op.getDecorList())
+            decoList.add(new Pair<LogicalVariable, Mutable<ILogicalExpression>>(pair.first,
+                    deepCopyExpressionRef(pair.second)));
+        for (ILogicalPlan plan : op.getNestedPlans()) {
+            newSubplans.add(OperatorManipulationUtil.deepCopy(plan));
+        }
+        return new GroupByOperator(groupByList, decoList, newSubplans);
+    }
+
+    @Override
+    public ILogicalOperator visitLimitOperator(LimitOperator op, Void arg) throws AlgebricksException {
+        return new LimitOperator(deepCopyExpressionRef(op.getMaxObjects()).getValue(), deepCopyExpressionRef(
+                op.getOffset()).getValue(), op.isTopmostLimitOp());
+    }
+
+    @Override
+    public ILogicalOperator visitInnerJoinOperator(InnerJoinOperator op, Void arg) throws AlgebricksException {
+        return new InnerJoinOperator(deepCopyExpressionRef(op.getCondition()), op.getInputs().get(0), op.getInputs()
+                .get(1));
+    }
+
+    @Override
+    public ILogicalOperator visitLeftOuterJoinOperator(LeftOuterJoinOperator op, Void arg) throws AlgebricksException {
+        return new LeftOuterJoinOperator(deepCopyExpressionRef(op.getCondition()), op.getInputs().get(0), op
+                .getInputs().get(1));
+    }
+
+    @Override
+    public ILogicalOperator visitNestedTupleSourceOperator(NestedTupleSourceOperator op, Void arg)
+            throws AlgebricksException {
+        return new NestedTupleSourceOperator(null);
+    }
+
+    @Override
+    public ILogicalOperator visitOrderOperator(OrderOperator op, Void arg) throws AlgebricksException {
+        return new OrderOperator(this.deepCopyOrderAndExpression(op.getOrderExpressions()));
+    }
+
+    @Override
+    public ILogicalOperator visitAssignOperator(AssignOperator op, Void arg) throws AlgebricksException {
+        ArrayList<LogicalVariable> newList = new ArrayList<LogicalVariable>();
+        ArrayList<Mutable<ILogicalExpression>> newExpressions = new ArrayList<Mutable<ILogicalExpression>>();
+        newList.addAll(op.getVariables());
+        deepCopyExpressionRefs(newExpressions, op.getExpressions());
+        return new AssignOperator(newList, newExpressions);
+    }
+
+    @Override
+    public ILogicalOperator visitSelectOperator(SelectOperator op, Void arg) throws AlgebricksException {
+        return new SelectOperator(deepCopyExpressionRef(op.getCondition()), op.getRetainNull(),
+                op.getNullPlaceholderVariable());
+    }
+
+    @Override
+    public ILogicalOperator visitProjectOperator(ProjectOperator op, Void arg) throws AlgebricksException {
+        ArrayList<LogicalVariable> newList = new ArrayList<LogicalVariable>();
+        newList.addAll(op.getVariables());
+        return new ProjectOperator(newList);
+    }
+
+    @Override
+    public ILogicalOperator visitPartitioningSplitOperator(PartitioningSplitOperator op, Void arg)
+            throws AlgebricksException {
+        ArrayList<Mutable<ILogicalExpression>> newExpressions = new ArrayList<Mutable<ILogicalExpression>>();
+        deepCopyExpressionRefs(newExpressions, op.getExpressions());
+        return new PartitioningSplitOperator(newExpressions, op.getDefaultBranchIndex());
+    }
+
+    @Override
+    public ILogicalOperator visitReplicateOperator(ReplicateOperator op, Void arg) throws AlgebricksException {
+        return new ReplicateOperator(op.getOutputArity());
+    }
+
+    @Override
+    public ILogicalOperator visitScriptOperator(ScriptOperator op, Void arg) throws AlgebricksException {
+        ArrayList<LogicalVariable> newInputList = new ArrayList<LogicalVariable>();
+        ArrayList<LogicalVariable> newOutputList = new ArrayList<LogicalVariable>();
+        newInputList.addAll(op.getInputVariables());
+        newOutputList.addAll(op.getOutputVariables());
+        return new ScriptOperator(op.getScriptDescription(), newInputList, newOutputList);
+    }
+
+    @Override
+    public ILogicalOperator visitSubplanOperator(SubplanOperator op, Void arg) throws AlgebricksException {
+        ArrayList<ILogicalPlan> newSubplans = new ArrayList<ILogicalPlan>();
+        for (ILogicalPlan plan : op.getNestedPlans()) {
+            newSubplans.add(OperatorManipulationUtil.deepCopy(plan));
+        }
+        return new SubplanOperator(newSubplans);
+    }
+
+    @Override
+    public ILogicalOperator visitUnionOperator(UnionAllOperator op, Void arg) throws AlgebricksException {
+        List<Triple<LogicalVariable, LogicalVariable, LogicalVariable>> newVarMap = new ArrayList<Triple<LogicalVariable, LogicalVariable, LogicalVariable>>();
+        List<Triple<LogicalVariable, LogicalVariable, LogicalVariable>> varMap = op.getVariableMappings();
+        for (Triple<LogicalVariable, LogicalVariable, LogicalVariable> triple : varMap)
+            newVarMap.add(new Triple<LogicalVariable, LogicalVariable, LogicalVariable>(triple.first, triple.second,
+                    triple.third));
+        return new UnionAllOperator(newVarMap);
+    }
+
+    @Override
+    public ILogicalOperator visitUnnestOperator(UnnestOperator op, Void arg) throws AlgebricksException {
+        return new UnnestOperator(op.getVariable(), deepCopyExpressionRef(op.getExpressionRef()),
+                op.getPositionalVariable(), op.getPositionalVariableType(), op.getPositionWriter());
+    }
+
+    @Override
+    public ILogicalOperator visitUnnestMapOperator(UnnestMapOperator op, Void arg) throws AlgebricksException {
+        ArrayList<LogicalVariable> newInputList = new ArrayList<LogicalVariable>();
+        newInputList.addAll(op.getVariables());
+        return new UnnestMapOperator(newInputList, deepCopyExpressionRef(op.getExpressionRef()), new ArrayList<Object>(
+                op.getVariableTypes()), op.propagatesInput());
+    }
+
+    @Override
+    public ILogicalOperator visitDataScanOperator(DataSourceScanOperator op, Void arg) throws AlgebricksException {
+        ArrayList<LogicalVariable> newInputList = new ArrayList<LogicalVariable>();
+        newInputList.addAll(op.getVariables());
+        return new DataSourceScanOperator(newInputList, op.getDataSource());
+    }
+
+    @Override
+    public ILogicalOperator visitDistinctOperator(DistinctOperator op, Void arg) throws AlgebricksException {
+        ArrayList<Mutable<ILogicalExpression>> newExpressions = new ArrayList<Mutable<ILogicalExpression>>();
+        deepCopyExpressionRefs(newExpressions, op.getExpressions());
+        return new DistinctOperator(newExpressions);
+    }
+
+    @Override
+    public ILogicalOperator visitExchangeOperator(ExchangeOperator op, Void arg) throws AlgebricksException {
+        return new ExchangeOperator();
+    }
+
+    @Override
+    public ILogicalOperator visitWriteOperator(WriteOperator op, Void arg) throws AlgebricksException {
+        ArrayList<Mutable<ILogicalExpression>> newExpressions = new ArrayList<Mutable<ILogicalExpression>>();
+        deepCopyExpressionRefs(newExpressions, op.getExpressions());
+        return new WriteOperator(newExpressions, op.getDataSink());
+    }
+
+    @Override
+    public ILogicalOperator visitDistributeResultOperator(DistributeResultOperator op, Void arg)
+            throws AlgebricksException {
+        ArrayList<Mutable<ILogicalExpression>> newExpressions = new ArrayList<Mutable<ILogicalExpression>>();
+        deepCopyExpressionRefs(newExpressions, op.getExpressions());
+        return new DistributeResultOperator(newExpressions, op.getDataSink());
+    }
+
+    @Override
+    public ILogicalOperator visitWriteResultOperator(WriteResultOperator op, Void arg) throws AlgebricksException {
+        ArrayList<Mutable<ILogicalExpression>> newKeyExpressions = new ArrayList<Mutable<ILogicalExpression>>();
+        deepCopyExpressionRefs(newKeyExpressions, op.getKeyExpressions());
+        List<Mutable<ILogicalExpression>> newLSMComponentFilterExpressions = new ArrayList<Mutable<ILogicalExpression>>();
+        deepCopyExpressionRefs(newKeyExpressions, op.getAdditionalFilteringExpressions());
+        WriteResultOperator writeResultOp = new WriteResultOperator(op.getDataSource(),
+                deepCopyExpressionRef(op.getPayloadExpression()), newKeyExpressions);
+        writeResultOp.setAdditionalFilteringExpressions(newLSMComponentFilterExpressions);
+        return writeResultOp;
+    }
+
+    @Override
+    public ILogicalOperator visitInsertDeleteOperator(InsertDeleteOperator op, Void arg) throws AlgebricksException {
+        List<Mutable<ILogicalExpression>> newKeyExpressions = new ArrayList<Mutable<ILogicalExpression>>();
+        deepCopyExpressionRefs(newKeyExpressions, op.getPrimaryKeyExpressions());
+        List<Mutable<ILogicalExpression>> newLSMComponentFilterExpressions = new ArrayList<Mutable<ILogicalExpression>>();
+        deepCopyExpressionRefs(newKeyExpressions, op.getAdditionalFilteringExpressions());
+        InsertDeleteOperator insertDeleteOp = new InsertDeleteOperator(op.getDataSource(),
+                deepCopyExpressionRef(op.getPayloadExpression()), newKeyExpressions, op.getOperation(), op.isBulkload());
+        insertDeleteOp.setAdditionalFilteringExpressions(newLSMComponentFilterExpressions);
+        return insertDeleteOp;
+    }
+
+    @Override
+    public ILogicalOperator visitIndexInsertDeleteOperator(IndexInsertDeleteOperator op, Void arg)
+            throws AlgebricksException {
+        List<Mutable<ILogicalExpression>> newPrimaryKeyExpressions = new ArrayList<Mutable<ILogicalExpression>>();
+        deepCopyExpressionRefs(newPrimaryKeyExpressions, op.getPrimaryKeyExpressions());
+        List<Mutable<ILogicalExpression>> newSecondaryKeyExpressions = new ArrayList<Mutable<ILogicalExpression>>();
+        deepCopyExpressionRefs(newSecondaryKeyExpressions, op.getSecondaryKeyExpressions());
+        Mutable<ILogicalExpression> newFilterExpression = new MutableObject<ILogicalExpression>(
+                ((AbstractLogicalExpression) op.getFilterExpression()).cloneExpression());
+        List<Mutable<ILogicalExpression>> newLSMComponentFilterExpressions = new ArrayList<Mutable<ILogicalExpression>>();
+        deepCopyExpressionRefs(newLSMComponentFilterExpressions, op.getAdditionalFilteringExpressions());
+        IndexInsertDeleteOperator indexInsertDeleteOp = new IndexInsertDeleteOperator(op.getDataSourceIndex(),
+                newPrimaryKeyExpressions, newSecondaryKeyExpressions, newFilterExpression, op.getOperation(),
+                op.isBulkload());
+        indexInsertDeleteOp.setAdditionalFilteringExpressions(newLSMComponentFilterExpressions);
+        return indexInsertDeleteOp;
+    }
+
+    @Override
+    public ILogicalOperator visitTokenizeOperator(TokenizeOperator op, Void arg) throws AlgebricksException {
+        List<Mutable<ILogicalExpression>> newPrimaryKeyExpressions = new ArrayList<Mutable<ILogicalExpression>>();
+        deepCopyExpressionRefs(newPrimaryKeyExpressions, op.getPrimaryKeyExpressions());
+        List<Mutable<ILogicalExpression>> newSecondaryKeyExpressions = new ArrayList<Mutable<ILogicalExpression>>();
+        deepCopyExpressionRefs(newSecondaryKeyExpressions, op.getSecondaryKeyExpressions());
+        List<LogicalVariable> newTokenizeVars = new ArrayList<LogicalVariable>();
+        deepCopyVars(newTokenizeVars, op.getTokenizeVars());
+        Mutable<ILogicalExpression> newFilterExpression = new MutableObject<ILogicalExpression>(
+                ((AbstractLogicalExpression) op.getFilterExpression()).cloneExpression());
+        List<Object> newTokenizeVarTypes = new ArrayList<Object>();
+        deepCopyObjects(newTokenizeVarTypes, op.getTokenizeVarTypes());
+
+        TokenizeOperator tokenizeOp = new TokenizeOperator(op.getDataSourceIndex(), newPrimaryKeyExpressions,
+                newSecondaryKeyExpressions, newTokenizeVars, newFilterExpression, op.getOperation(), op.isBulkload(),
+                op.isPartitioned(), newTokenizeVarTypes);
+        return tokenizeOp;
+    }
+
+    @Override
+    public ILogicalOperator visitSinkOperator(SinkOperator op, Void arg) throws AlgebricksException {
+        return new SinkOperator();
+    }
+
+    private void deepCopyExpressionRefs(List<Mutable<ILogicalExpression>> newExprs,
+            List<Mutable<ILogicalExpression>> oldExprs) {
+        for (Mutable<ILogicalExpression> oldExpr : oldExprs)
+            newExprs.add(new MutableObject<ILogicalExpression>(((AbstractLogicalExpression) oldExpr.getValue())
+                    .cloneExpression()));
+    }
+
+    private Mutable<ILogicalExpression> deepCopyExpressionRef(Mutable<ILogicalExpression> oldExpr) {
+        return new MutableObject<ILogicalExpression>(((AbstractLogicalExpression) oldExpr.getValue()).cloneExpression());
+    }
+
+    private List<LogicalVariable> deepCopyVars(List<LogicalVariable> newVars, List<LogicalVariable> oldVars) {
+        for (LogicalVariable oldVar : oldVars)
+            newVars.add(oldVar);
+        return newVars;
+    }
+
+    private List<Object> deepCopyObjects(List<Object> newObjs, List<Object> oldObjs) {
+        for (Object oldObj : oldObjs)
+            newObjs.add(oldObj);
+        return newObjs;
+    }
+
+    private List<Pair<IOrder, Mutable<ILogicalExpression>>> deepCopyOrderAndExpression(
+            List<Pair<IOrder, Mutable<ILogicalExpression>>> ordersAndExprs) {
+        List<Pair<IOrder, Mutable<ILogicalExpression>>> newOrdersAndExprs = new ArrayList<Pair<IOrder, Mutable<ILogicalExpression>>>();
+        for (Pair<IOrder, Mutable<ILogicalExpression>> pair : ordersAndExprs)
+            newOrdersAndExprs.add(new Pair<IOrder, Mutable<ILogicalExpression>>(pair.first,
+                    deepCopyExpressionRef(pair.second)));
+        return newOrdersAndExprs;
+    }
+
+    @Override
+    public ILogicalOperator visitExtensionOperator(ExtensionOperator op, Void arg) throws AlgebricksException {
+        return new ExtensionOperator(op.getNewInstanceOfDelegateOperator());
+    }
+
+    @Override
+    public ILogicalOperator visitExternalDataLookupOperator(ExternalDataLookupOperator op, Void arg)
+            throws AlgebricksException {
+        ArrayList<LogicalVariable> newInputList = new ArrayList<LogicalVariable>();
+        newInputList.addAll(op.getVariables());
+        return new ExternalDataLookupOperator(newInputList, deepCopyExpressionRef(op.getExpressionRef()),
+                new ArrayList<Object>(op.getVariableTypes()), op.isPropagateInput(), op.getDataSource());
+    }
+
+    @Override
+    public ILogicalOperator visitMaterializeOperator(MaterializeOperator op, Void arg) throws AlgebricksException {
+        return new MaterializeOperator();
+    }
+}

http://git-wip-us.apache.org/repos/asf/incubator-asterixdb-hyracks/blob/9939b48e/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/operators/logical/visitors/ProducedVariableVisitor.java
----------------------------------------------------------------------
diff --git a/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/operators/logical/visitors/ProducedVariableVisitor.java b/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/operators/logical/visitors/ProducedVariableVisitor.java
new file mode 100644
index 0000000..1fa97a6
--- /dev/null
+++ b/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/operators/logical/visitors/ProducedVariableVisitor.java
@@ -0,0 +1,275 @@
+/*
+ * Copyright 2009-2013 by The Regents of the University of California
+ * Licensed 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 from
+ *
+ *     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 edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.visitors;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+import org.apache.commons.lang3.mutable.Mutable;
+
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.common.utils.Triple;
+import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
+import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
+import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AggregateOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AssignOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.DataSourceScanOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.DistinctOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.DistributeResultOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.EmptyTupleSourceOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ExchangeOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ExtensionOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ExternalDataLookupOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.GroupByOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IndexInsertDeleteOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.InnerJoinOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.InsertDeleteOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.LeftOuterJoinOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.LimitOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.MaterializeOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.NestedTupleSourceOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.OrderOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.PartitioningSplitOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ProjectOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ReplicateOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.RunningAggregateOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ScriptOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SelectOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SinkOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SubplanOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.TokenizeOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.UnionAllOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.UnnestMapOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.UnnestOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.WriteOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.WriteResultOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
+
+public class ProducedVariableVisitor implements ILogicalOperatorVisitor<Void, Void> {
+
+    private Collection<LogicalVariable> producedVariables;
+
+    public ProducedVariableVisitor(Collection<LogicalVariable> producedVariables) throws AlgebricksException {
+        this.producedVariables = producedVariables;
+    }
+
+    @Override
+    public Void visitAggregateOperator(AggregateOperator op, Void arg) throws AlgebricksException {
+        producedVariables.addAll(op.getVariables());
+        return null;
+    }
+
+    @Override
+    public Void visitAssignOperator(AssignOperator op, Void arg) throws AlgebricksException {
+        producedVariables.addAll(op.getVariables());
+        return null;
+    }
+
+    @Override
+    public Void visitDataScanOperator(DataSourceScanOperator op, Void arg) throws AlgebricksException {
+        producedVariables.addAll(op.getVariables());
+        return null;
+    }
+
+    @Override
+    public Void visitDistinctOperator(DistinctOperator op, Void arg) {
+        return null;
+    }
+
+    @Override
+    public Void visitEmptyTupleSourceOperator(EmptyTupleSourceOperator op, Void arg) throws AlgebricksException {
+        return null;
+    }
+
+    @Override
+    public Void visitExchangeOperator(ExchangeOperator op, Void arg) throws AlgebricksException {
+        return null;
+    }
+
+    @Override
+    public Void visitGroupByOperator(GroupByOperator op, Void arg) throws AlgebricksException {
+        for (ILogicalPlan p : op.getNestedPlans()) {
+            for (Mutable<ILogicalOperator> r : p.getRoots()) {
+                VariableUtilities.getLiveVariables(r.getValue(), producedVariables);
+            }
+        }
+        for (Pair<LogicalVariable, Mutable<ILogicalExpression>> p : op.getGroupByList()) {
+            if (p.first != null) {
+                producedVariables.add(p.first);
+            }
+        }
+        for (Pair<LogicalVariable, Mutable<ILogicalExpression>> p : op.getDecorList()) {
+            if (p.first != null) {
+                producedVariables.add(p.first);
+            }
+        }
+        return null;
+    }
+
+    @Override
+    public Void visitInnerJoinOperator(InnerJoinOperator op, Void arg) throws AlgebricksException {
+        return null;
+    }
+
+    @Override
+    public Void visitLeftOuterJoinOperator(LeftOuterJoinOperator op, Void arg) throws AlgebricksException {
+        return null;
+    }
+
+    @Override
+    public Void visitLimitOperator(LimitOperator op, Void arg) throws AlgebricksException {
+        return null;
+    }
+
+    @Override
+    public Void visitNestedTupleSourceOperator(NestedTupleSourceOperator op, Void arg) throws AlgebricksException {
+        return null;
+    }
+
+    @Override
+    public Void visitOrderOperator(OrderOperator op, Void arg) throws AlgebricksException {
+        return null;
+    }
+
+    @Override
+    public Void visitPartitioningSplitOperator(PartitioningSplitOperator op, Void arg) throws AlgebricksException {
+        return null;
+    }
+
+    @Override
+    public Void visitProjectOperator(ProjectOperator op, Void arg) throws AlgebricksException {
+        return null;
+    }
+
+    @Override
+    public Void visitRunningAggregateOperator(RunningAggregateOperator op, Void arg) throws AlgebricksException {
+        producedVariables.addAll(op.getVariables());
+        return null;
+    }
+
+    @Override
+    public Void visitScriptOperator(ScriptOperator op, Void arg) throws AlgebricksException {
+        List<LogicalVariable> usedVariables = new ArrayList<LogicalVariable>();
+        VariableUtilities.getUsedVariables(op, usedVariables);
+        for (LogicalVariable v : op.getOutputVariables()) {
+            if (!usedVariables.contains(v)) {
+                producedVariables.add(v);
+            }
+        }
+        return null;
+    }
+
+    @Override
+    public Void visitSelectOperator(SelectOperator op, Void arg) throws AlgebricksException {
+        return null;
+    }
+
+    @Override
+    public Void visitSubplanOperator(SubplanOperator op, Void arg) throws AlgebricksException {
+        for (ILogicalPlan p : op.getNestedPlans()) {
+            for (Mutable<ILogicalOperator> r : p.getRoots()) {
+                VariableUtilities.getLiveVariables(r.getValue(), producedVariables);
+            }
+        }
+        return null;
+    }
+
+    @Override
+    public Void visitUnionOperator(UnionAllOperator op, Void arg) throws AlgebricksException {
+        for (Triple<LogicalVariable, LogicalVariable, LogicalVariable> t : op.getVariableMappings()) {
+            producedVariables.add(t.third);
+        }
+        return null;
+    }
+
+    @Override
+    public Void visitUnnestMapOperator(UnnestMapOperator op, Void arg) throws AlgebricksException {
+        producedVariables.addAll(op.getVariables());
+        return null;
+    }
+
+    @Override
+    public Void visitUnnestOperator(UnnestOperator op, Void arg) throws AlgebricksException {
+        producedVariables.addAll(op.getVariables());
+        LogicalVariable positionalVariable = op.getPositionalVariable();
+        if (positionalVariable != null) {
+            if (!producedVariables.contains(positionalVariable))
+                producedVariables.add(positionalVariable);
+        }
+        return null;
+    }
+
+    @Override
+    public Void visitWriteOperator(WriteOperator op, Void arg) throws AlgebricksException {
+        return null;
+    }
+
+    @Override
+    public Void visitDistributeResultOperator(DistributeResultOperator op, Void arg) throws AlgebricksException {
+        return null;
+    }
+
+    @Override
+    public Void visitWriteResultOperator(WriteResultOperator op, Void arg) throws AlgebricksException {
+        return null;
+    }
+
+    @Override
+    public Void visitReplicateOperator(ReplicateOperator op, Void arg) throws AlgebricksException {
+        return null;
+    }
+
+    @Override
+    public Void visitMaterializeOperator(MaterializeOperator op, Void arg) throws AlgebricksException {
+        return null;
+    }
+
+    @Override
+    public Void visitInsertDeleteOperator(InsertDeleteOperator op, Void arg) throws AlgebricksException {
+        return null;
+    }
+
+    @Override
+    public Void visitIndexInsertDeleteOperator(IndexInsertDeleteOperator op, Void arg) throws AlgebricksException {
+        return null;
+    }
+
+    @Override
+    public Void visitTokenizeOperator(TokenizeOperator op, Void arg) throws AlgebricksException {
+        producedVariables.addAll(op.getTokenizeVars());
+        return null;
+    }
+
+    @Override
+    public Void visitSinkOperator(SinkOperator op, Void arg) throws AlgebricksException {
+        return null;
+    }
+
+    @Override
+    public Void visitExtensionOperator(ExtensionOperator op, Void arg) throws AlgebricksException {
+        op.getDelegate().getProducedVariables(producedVariables);
+        return null;
+    }
+
+    @Override
+    public Void visitExternalDataLookupOperator(ExternalDataLookupOperator op, Void arg) throws AlgebricksException {
+        producedVariables.add(op.getVariables().get(0));
+        return null;
+    }
+}

http://git-wip-us.apache.org/repos/asf/incubator-asterixdb-hyracks/blob/9939b48e/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/operators/logical/visitors/SchemaVariableVisitor.java
----------------------------------------------------------------------
diff --git a/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/operators/logical/visitors/SchemaVariableVisitor.java b/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/operators/logical/visitors/SchemaVariableVisitor.java
new file mode 100644
index 0000000..0b37b92
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+++ b/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/operators/logical/visitors/SchemaVariableVisitor.java
@@ -0,0 +1,330 @@
+/*
+ * Copyright 2009-2013 by The Regents of the University of California
+ * Licensed 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 from
+ *
+ *     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 edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.visitors;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+import org.apache.commons.lang3.mutable.Mutable;
+
+import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
+import edu.uci.ics.hyracks.algebricks.common.utils.Pair;
+import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
+import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan;
+import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalExpressionTag;
+import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
+import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.VariableReferenceExpression;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AggregateOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AssignOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.DataSourceScanOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.DistinctOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.DistributeResultOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.EmptyTupleSourceOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ExchangeOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ExtensionOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ExternalDataLookupOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.GroupByOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IndexInsertDeleteOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.InnerJoinOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.InsertDeleteOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.LeftOuterJoinOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.LimitOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.MaterializeOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.NestedTupleSourceOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.OrderOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.PartitioningSplitOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ProjectOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ReplicateOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.RunningAggregateOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ScriptOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SelectOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SinkOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SubplanOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.TokenizeOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.UnionAllOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.UnnestMapOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.UnnestOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.WriteOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.WriteResultOperator;
+import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
+
+public class SchemaVariableVisitor implements ILogicalOperatorVisitor<Void, Void> {
+
+    private Collection<LogicalVariable> schemaVariables;
+
+    public SchemaVariableVisitor(Collection<LogicalVariable> schemaVariables) {
+        this.schemaVariables = schemaVariables;
+    }
+
+    @Override
+    public Void visitAggregateOperator(AggregateOperator op, Void arg) throws AlgebricksException {
+        schemaVariables.addAll(op.getVariables());
+        return null;
+    }
+
+    @Override
+    public Void visitAssignOperator(AssignOperator op, Void arg) throws AlgebricksException {
+        standardLayout(op);
+        return null;
+    }
+
+    @Override
+    public Void visitDataScanOperator(DataSourceScanOperator op, Void arg) throws AlgebricksException {
+        standardLayout(op);
+        return null;
+    }
+
+    @Override
+    public Void visitDistinctOperator(DistinctOperator op, Void arg) throws AlgebricksException {
+        List<LogicalVariable> allLiveVars = new ArrayList<LogicalVariable>();
+        for (Mutable<ILogicalOperator> c : op.getInputs()) {
+            VariableUtilities.getLiveVariables(c.getValue(), allLiveVars);
+        }
+        VariableUtilities.getProducedVariables(op, allLiveVars);
+        /** put distinct vars first */
+        schemaVariables.addAll(op.getDistinctByVarList());
+        /** then other live vars */
+        for (LogicalVariable var : allLiveVars) {
+            if (!schemaVariables.contains(var)) {
+                schemaVariables.add(var);
+            }
+        }
+        return null;
+    }
+
+    @Override
+    public Void visitEmptyTupleSourceOperator(EmptyTupleSourceOperator op, Void arg) throws AlgebricksException {
+        standardLayout(op);
+        return null;
+    }
+
+    @Override
+    public Void visitExchangeOperator(ExchangeOperator op, Void arg) throws AlgebricksException {
+        standardLayout(op);
+        return null;
+    }
+
+    @Override
+    public Void visitGroupByOperator(GroupByOperator op, Void arg) throws AlgebricksException {
+        for (ILogicalPlan p : op.getNestedPlans()) {
+            for (Mutable<ILogicalOperator> r : p.getRoots()) {
+                VariableUtilities.getLiveVariables(r.getValue(), schemaVariables);
+            }
+        }
+        for (Pair<LogicalVariable, Mutable<ILogicalExpression>> p : op.getGroupByList()) {
+            if (p.first != null) {
+                schemaVariables.add(p.first);
+            }
+        }
+        for (Pair<LogicalVariable, Mutable<ILogicalExpression>> p : op.getDecorList()) {
+            if (p.first != null) {
+                schemaVariables.add(p.first);
+            } else {
+                ILogicalExpression e = p.second.getValue();
+                if (e.getExpressionTag() == LogicalExpressionTag.VARIABLE) {
+                    schemaVariables.add(((VariableReferenceExpression) e).getVariableReference());
+                }
+            }
+        }
+        return null;
+    }
+
+    @Override
+    public Void visitInnerJoinOperator(InnerJoinOperator op, Void arg) throws AlgebricksException {
+        standardLayout(op);
+        return null;
+    }
+
+    @Override
+    public Void visitLeftOuterJoinOperator(LeftOuterJoinOperator op, Void arg) throws AlgebricksException {
+        standardLayout(op);
+        return null;
+    }
+
+    @Override
+    public Void visitLimitOperator(LimitOperator op, Void arg) throws AlgebricksException {
+        standardLayout(op);
+        return null;
+    }
+
+    @Override
+    public Void visitNestedTupleSourceOperator(NestedTupleSourceOperator op, Void arg) throws AlgebricksException {
+        VariableUtilities.getLiveVariables(op.getSourceOperator(), schemaVariables);
+        return null;
+    }
+
+    @Override
+    public Void visitOrderOperator(OrderOperator op, Void arg) throws AlgebricksException {
+        standardLayout(op);
+        return null;
+    }
+
+    @Override
+    public Void visitPartitioningSplitOperator(PartitioningSplitOperator op, Void arg) throws AlgebricksException {
+        standardLayout(op);
+        return null;
+    }
+
+    @Override
+    public Void visitProjectOperator(ProjectOperator op, Void arg) throws AlgebricksException {
+        schemaVariables.addAll(op.getVariables());
+        return null;
+    }
+
+    @Override
+    public Void visitRunningAggregateOperator(RunningAggregateOperator op, Void arg) throws AlgebricksException {
+        // VariableUtilities.getProducedVariables(op, schemaVariables);
+        standardLayout(op);
+        return null;
+    }
+
+    @Override
+    public Void visitScriptOperator(ScriptOperator op, Void arg) throws AlgebricksException {
+        schemaVariables.addAll(op.getOutputVariables());
+        return null;
+    }
+
+    @Override
+    public Void visitSelectOperator(SelectOperator op, Void arg) throws AlgebricksException {
+        standardLayout(op);
+        return null;
+    }
+
+    @Override
+    public Void visitSubplanOperator(SubplanOperator op, Void arg) throws AlgebricksException {
+        for (Mutable<ILogicalOperator> c : op.getInputs()) {
+            VariableUtilities.getLiveVariables(c.getValue(), schemaVariables);
+        }
+        VariableUtilities.getProducedVariables(op, schemaVariables);
+        for (ILogicalPlan p : op.getNestedPlans()) {
+            for (Mutable<ILogicalOperator> r : p.getRoots()) {
+                VariableUtilities.getLiveVariables(r.getValue(), schemaVariables);
+            }
+        }
+        return null;
+    }
+
+    @Override
+    public Void visitUnionOperator(UnionAllOperator op, Void arg) throws AlgebricksException {
+        VariableUtilities.getProducedVariables(op, schemaVariables);
+        return null;
+    }
+
+    @Override
+    public Void visitUnnestMapOperator(UnnestMapOperator op, Void arg) throws AlgebricksException {
+        if (op.propagatesInput()) {
+            standardLayout(op);
+        } else {
+            VariableUtilities.getProducedVariables(op, schemaVariables);
+        }
+        return null;
+    }
+
+    @Override
+    public Void visitUnnestOperator(UnnestOperator op, Void arg) throws AlgebricksException {
+        standardLayout(op);
+        return null;
+    }
+
+    @Override
+    public Void visitWriteOperator(WriteOperator op, Void arg) throws AlgebricksException {
+        standardLayout(op);
+        return null;
+    }
+
+    @Override
+    public Void visitDistributeResultOperator(DistributeResultOperator op, Void arg) throws AlgebricksException {
+        standardLayout(op);
+        return null;
+    }
+
+    @Override
+    public Void visitWriteResultOperator(WriteResultOperator op, Void arg) throws AlgebricksException {
+        standardLayout(op);
+        return null;
+    }
+
+    private void standardLayout(ILogicalOperator op) throws AlgebricksException {
+        for (Mutable<ILogicalOperator> c : op.getInputs()) {
+            VariableUtilities.getLiveVariables(c.getValue(), schemaVariables);
+        }
+        VariableUtilities.getProducedVariables(op, schemaVariables);
+    }
+
+    @Override
+    public Void visitReplicateOperator(ReplicateOperator op, Void arg) throws AlgebricksException {
+        standardLayout(op);
+        return null;
+    }
+
+    @Override
+    public Void visitMaterializeOperator(MaterializeOperator op, Void arg) throws AlgebricksException {
+        standardLayout(op);
+        return null;
+    }
+
+    @Override
+    public Void visitInsertDeleteOperator(InsertDeleteOperator op, Void arg) throws AlgebricksException {
+        standardLayout(op);
+        return null;
+    }
+
+    @Override
+    public Void visitIndexInsertDeleteOperator(IndexInsertDeleteOperator op, Void arg) throws AlgebricksException {
+        standardLayout(op);
+        return null;
+    }
+
+    @Override
+    public Void visitTokenizeOperator(TokenizeOperator op, Void arg) throws AlgebricksException {
+        standardLayout(op);
+        return null;
+    }
+
+    @Override
+    public Void visitSinkOperator(SinkOperator op, Void arg) throws AlgebricksException {
+        standardLayout(op);
+        return null;
+    }
+
+    @Override
+    public Void visitExtensionOperator(ExtensionOperator op, Void arg) throws AlgebricksException {
+        standardLayout(op);
+        return null;
+    }
+
+    @Override
+    public Void visitExternalDataLookupOperator(ExternalDataLookupOperator op, Void arg) throws AlgebricksException {
+        ArrayList<LogicalVariable> liveVariables = new ArrayList<LogicalVariable>();
+        ArrayList<LogicalVariable> usedVariables = new ArrayList<LogicalVariable>();
+        //get used variables
+        op.getExpressionRef().getValue().getUsedVariables(usedVariables);
+        //live variables - used variables
+        for (Mutable<ILogicalOperator> c : op.getInputs()) {
+            VariableUtilities.getLiveVariables(c.getValue(), liveVariables);
+        }
+        for (LogicalVariable v : liveVariables) {
+            if (!usedVariables.contains(v)) {
+                schemaVariables.add(v);
+            }
+        }
+        VariableUtilities.getProducedVariables(op, schemaVariables);
+        //+ produced variables
+        return null;
+    }
+
+}


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