| package edu.uci.ics.hyracks.algebricks.rewriter.rules; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| 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.ILogicalOperator; |
| 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.expressions.AggregateFunctionCallExpression; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator.ExecutionMode; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AggregateOperator; |
| |
| public class IntroduceAggregateCombinerRule extends AbstractIntroduceCombinerRule { |
| |
| @Override |
| public boolean rewritePost(Mutable<ILogicalOperator> opRef, IOptimizationContext context) |
| throws AlgebricksException { |
| AbstractLogicalOperator op = (AbstractLogicalOperator) opRef.getValue(); |
| if (context.checkIfInDontApplySet(this, op)) { |
| return false; |
| } |
| context.addToDontApplySet(this, op); |
| if (op.getOperatorTag() != LogicalOperatorTag.AGGREGATE) { |
| return false; |
| } |
| AggregateOperator aggOp = (AggregateOperator) op; |
| if (!aggOp.isGlobal() || aggOp.getExecutionMode() == ExecutionMode.LOCAL) { |
| return false; |
| } |
| Map<AggregateFunctionCallExpression, SimilarAggregatesInfo> toReplaceMap = new HashMap<AggregateFunctionCallExpression, SimilarAggregatesInfo>(); |
| Pair<Boolean, Mutable<ILogicalOperator>> result = tryToPushAgg(aggOp, null, toReplaceMap, context); |
| if (!result.first || result.second == null) { |
| return false; |
| } |
| replaceOriginalAggFuncs(toReplaceMap); |
| context.computeAndSetTypeEnvironmentForOperator(aggOp); |
| return true; |
| } |
| } |