| package edu.uci.ics.hivesterix.optimizer.rules; |
| |
| import org.apache.commons.lang3.mutable.Mutable; |
| |
| import edu.uci.ics.hivesterix.logical.plan.HiveOperatorAnnotations; |
| import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException; |
| 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.IPhysicalOperator; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.OperatorAnnotations; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.PhysicalOperatorTag; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.ExchangeOperator; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.operators.physical.OneToOneExchangePOperator; |
| import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule; |
| |
| public class LocalGroupByRule implements IAlgebraicRewriteRule { |
| |
| @Override |
| public boolean rewritePre(Mutable<ILogicalOperator> opRef, |
| IOptimizationContext context) throws AlgebricksException { |
| return false; |
| } |
| |
| @Override |
| public boolean rewritePost(Mutable<ILogicalOperator> opRef, |
| IOptimizationContext context) throws AlgebricksException { |
| AbstractLogicalOperator op = (AbstractLogicalOperator) opRef.getValue(); |
| if (op.getOperatorTag() != LogicalOperatorTag.GROUP) { |
| return false; |
| } |
| Boolean localGby = (Boolean) op.getAnnotations().get( |
| HiveOperatorAnnotations.LOCAL_GROUP_BY); |
| if (localGby != null && localGby.equals(Boolean.TRUE)) { |
| Boolean hashGby = (Boolean) op.getAnnotations().get( |
| OperatorAnnotations.USE_HASH_GROUP_BY); |
| Boolean externalGby = (Boolean) op.getAnnotations().get( |
| OperatorAnnotations.USE_EXTERNAL_GROUP_BY); |
| if ((hashGby != null && (hashGby.equals(Boolean.TRUE)) || (externalGby != null && externalGby |
| .equals(Boolean.TRUE)))) { |
| reviseExchange(op); |
| } else { |
| ILogicalOperator child = op.getInputs().get(0).getValue(); |
| AbstractLogicalOperator childOp = (AbstractLogicalOperator) child; |
| while (child.getInputs().size() > 0) { |
| if (childOp.getOperatorTag() == LogicalOperatorTag.ORDER) |
| break; |
| else { |
| child = child.getInputs().get(0).getValue(); |
| childOp = (AbstractLogicalOperator) child; |
| } |
| } |
| if (childOp.getOperatorTag() == LogicalOperatorTag.ORDER) |
| reviseExchange(childOp); |
| } |
| return true; |
| } |
| return false; |
| } |
| |
| private void reviseExchange(AbstractLogicalOperator op) { |
| ExchangeOperator exchange = (ExchangeOperator) op.getInputs().get(0) |
| .getValue(); |
| IPhysicalOperator physicalOp = exchange.getPhysicalOperator(); |
| if (physicalOp.getOperatorTag() == PhysicalOperatorTag.HASH_PARTITION_EXCHANGE) { |
| exchange.setPhysicalOperator(new OneToOneExchangePOperator()); |
| } |
| } |
| |
| } |