| /* |
| * 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.rewriter.rules; |
| |
| import org.apache.commons.lang3.mutable.Mutable; |
| |
| import edu.uci.ics.hyracks.algebricks.common.exceptions.NotImplementedException; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.util.OperatorManipulationUtil; |
| import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule; |
| |
| /** |
| * This rule sets the executionMode property of an operator, w/o introducing |
| * EXCHANGE operators in the plan. Previously, i.e. before having physical |
| * optimizations in place, we were using the IntroduceExchangeRule, which was |
| * doing both, to both set excutionMode and introduce data exchange ops. |
| * |
| * @author Nicola |
| */ |
| public class SetExecutionModeRule implements IAlgebraicRewriteRule { |
| |
| @Override |
| public boolean rewritePost(Mutable<ILogicalOperator> opRef, IOptimizationContext context) { |
| AbstractLogicalOperator op = (AbstractLogicalOperator) opRef.getValue(); |
| boolean changed = OperatorManipulationUtil.setOperatorMode(op); |
| if (op.getExecutionMode() == AbstractLogicalOperator.ExecutionMode.UNPARTITIONED |
| || op.getExecutionMode() == AbstractLogicalOperator.ExecutionMode.LOCAL) { |
| return changed; |
| } |
| switch (op.getOperatorTag()) { |
| // case DISTINCT: |
| // case AGGREGATE: |
| // case GROUP: |
| // case ORDER: |
| // case INNERJOIN: |
| // case LEFTOUTERJOIN: { |
| // op.setExecutionMode(ExecutionMode.GLOBAL); |
| // return true; |
| // } |
| |
| case PARTITIONINGSPLIT: { |
| throw new NotImplementedException(); |
| } |
| default: { |
| return changed; |
| } |
| } |
| |
| } |
| |
| @Override |
| public boolean rewritePre(Mutable<ILogicalOperator> opRef, IOptimizationContext context) { |
| return false; |
| } |
| |
| } |