| /* |
| * Copyright 2009-2010 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.rewriter.rules; |
| |
| import java.util.HashSet; |
| |
| import org.apache.commons.lang3.mutable.Mutable; |
| import org.apache.commons.lang3.mutable.MutableObject; |
| |
| import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalPlan; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.ConstantExpression; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractScanOperator; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.InnerJoinOperator; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.SubplanOperator; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.visitors.VariableUtilities; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.util.OperatorManipulationUtil; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.util.OperatorPropertiesUtil; |
| import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule; |
| |
| public class ComplexJoinInferenceRule implements IAlgebraicRewriteRule { |
| |
| @Override |
| public boolean rewritePost(Mutable<ILogicalOperator> opRef, IOptimizationContext context) |
| throws AlgebricksException { |
| ILogicalOperator op = opRef.getValue(); |
| if (!(op instanceof AbstractScanOperator)) { |
| return false; |
| } |
| |
| Mutable<ILogicalOperator> opRef2 = op.getInputs().get(0); |
| AbstractLogicalOperator op2 = (AbstractLogicalOperator) opRef2.getValue(); |
| if (op2.getOperatorTag() != LogicalOperatorTag.SUBPLAN) { |
| return false; |
| } |
| SubplanOperator subplan = (SubplanOperator) op2; |
| |
| Mutable<ILogicalOperator> opRef3 = subplan.getInputs().get(0); |
| AbstractLogicalOperator op3 = (AbstractLogicalOperator) opRef3.getValue(); |
| |
| if (op3.getOperatorTag() == LogicalOperatorTag.EMPTYTUPLESOURCE |
| || op3.getOperatorTag() == LogicalOperatorTag.NESTEDTUPLESOURCE) { |
| return false; |
| } |
| |
| if (subplanHasFreeVariables(subplan)) { |
| return false; |
| } |
| |
| HashSet<LogicalVariable> varsUsedInUnnest = new HashSet<LogicalVariable>(); |
| VariableUtilities.getUsedVariables(op, varsUsedInUnnest); |
| |
| HashSet<LogicalVariable> producedInSubplan = new HashSet<LogicalVariable>(); |
| VariableUtilities.getProducedVariables(subplan, producedInSubplan); |
| |
| if (!producedInSubplan.containsAll(varsUsedInUnnest)) { |
| return false; |
| } |
| |
| ntsToEtsInSubplan(subplan, context); |
| InnerJoinOperator join = new InnerJoinOperator(new MutableObject<ILogicalExpression>(ConstantExpression.TRUE)); |
| join.getInputs().add(opRef3); |
| opRef2.setValue(OperatorManipulationUtil.eliminateSingleSubplanOverEts(subplan)); |
| join.getInputs().add(new MutableObject<ILogicalOperator>(op)); |
| opRef.setValue(join); |
| context.computeAndSetTypeEnvironmentForOperator(join); |
| return true; |
| } |
| |
| @Override |
| public boolean rewritePre(Mutable<ILogicalOperator> opRef, IOptimizationContext context) { |
| return false; |
| } |
| |
| private static void ntsToEtsInSubplan(SubplanOperator s, IOptimizationContext context) throws AlgebricksException { |
| for (ILogicalPlan p : s.getNestedPlans()) { |
| for (Mutable<ILogicalOperator> r : p.getRoots()) { |
| OperatorManipulationUtil.ntsToEts(r, context); |
| } |
| } |
| } |
| |
| private static boolean subplanHasFreeVariables(SubplanOperator s) throws AlgebricksException { |
| for (ILogicalPlan p : s.getNestedPlans()) { |
| for (Mutable<ILogicalOperator> r : p.getRoots()) { |
| if (OperatorPropertiesUtil.hasFreeVariablesInSelfOrDesc((AbstractLogicalOperator) r.getValue())) { |
| return true; |
| } |
| } |
| } |
| return false; |
| } |
| |
| } |