Leon-WTF commented on code in PR #2599: URL: https://github.com/apache/drill/pull/2599#discussion_r1096965727
########## exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillAddAggForExceptRule.java: ########## @@ -0,0 +1,76 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you 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 at + * + * 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 org.apache.drill.exec.planner.logical; + +import org.apache.calcite.plan.RelOptRule; +import org.apache.calcite.plan.RelOptRuleCall; +import org.apache.calcite.plan.RelOptRuleOperand; +import org.apache.calcite.plan.hep.HepRelVertex; +import org.apache.calcite.rel.RelNode; +import org.apache.calcite.util.ImmutableBitSet; +import org.apache.calcite.util.trace.CalciteTrace; +import org.apache.curator.shaded.com.google.common.collect.ImmutableList; +import org.apache.drill.exec.planner.physical.PrelUtil; +import org.slf4j.Logger; + +import static org.apache.drill.exec.ExecConstants.EXCEPT_ADD_AGG_BELOW; + +/** + * Rule that try to add agg for Except set op. + */ +public class DrillAddAggForExceptRule extends RelOptRule { + public static final RelOptRule INSTANCE = new DrillAddAggForExceptRule(RelOptHelper.any(DrillExceptRel.class), "DrillAddAggForExceptRule"); + protected static final Logger tracer = CalciteTrace.getPlannerTracer(); + + public DrillAddAggForExceptRule(RelOptRuleOperand operand, String description) { + super(operand, description); + } + + @Override + public boolean matches(RelOptRuleCall call) { + DrillExceptRel drillExceptRel = call.rel(0); + return !drillExceptRel.all && !drillExceptRel.isAggAdded() && !findAggRel(drillExceptRel.getInput(0)); + } + + private boolean findAggRel(RelNode relNode) { + if (relNode instanceof HepRelVertex) { + return findAggRel(((HepRelVertex) relNode).getCurrentRel()); + } + if (relNode instanceof DrillAggregateRel) { + return true; + } + if (relNode.getInputs().size() == 1 && relNode.getInput(0) != null) { + return findAggRel(relNode.getInput(0)); + } + return false; + } + + @Override + public void onMatch(RelOptRuleCall call) { + final DrillExceptRel drillExceptRel = call.rel(0); + boolean addAggBelow = PrelUtil.getPlannerSettings(call.getPlanner()).getOptions().getOption(EXCEPT_ADD_AGG_BELOW); + if (addAggBelow) { + RelNode aggNode = new DrillAggregateRel(drillExceptRel.getCluster(), drillExceptRel.getTraitSet(), drillExceptRel.getInput(0), + ImmutableBitSet.range(0, drillExceptRel.getInput(0).getRowType().getFieldList().size()), ImmutableList.of(), ImmutableList.of()); + call.transformTo(drillExceptRel.copy(ImmutableList.of(aggNode, drillExceptRel.getInput(1)), true)); + } else { + call.transformTo(new DrillAggregateRel(drillExceptRel.getCluster(), drillExceptRel.getTraitSet(), drillExceptRel.copy(true), Review Comment: @vvysotskyi It's for performance, if the data cardinality is high, aggregate before except may not reduce many data, if the data after except left are few, aggregate after except will only handle few data which is faster than before except. This may be choosen by statistics info + CBO automaticlly in the future. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: dev-unsubscr...@drill.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
