| /* |
| * 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.physical; |
| |
| import java.util.List; |
| |
| import org.apache.drill.exec.planner.logical.DrillUnionRel; |
| import org.apache.drill.exec.planner.logical.RelOptHelper; |
| import org.apache.calcite.rel.InvalidRelException; |
| import org.apache.calcite.rel.RelNode; |
| import org.apache.calcite.plan.RelOptRule; |
| import org.apache.calcite.plan.RelOptRuleCall; |
| import org.apache.calcite.plan.RelTraitSet; |
| import org.apache.calcite.util.trace.CalciteTrace; |
| |
| import org.apache.drill.shaded.guava.com.google.common.collect.Lists; |
| import org.slf4j.Logger; |
| |
| public class UnionDistinctPrule extends Prule { |
| public static final RelOptRule INSTANCE = new UnionDistinctPrule(); |
| protected static final Logger tracer = CalciteTrace.getPlannerTracer(); |
| |
| private UnionDistinctPrule() { |
| super( |
| RelOptHelper.any(DrillUnionRel.class), "Prel.UnionDistinctPrule"); |
| } |
| |
| @Override |
| public boolean matches(RelOptRuleCall call) { |
| DrillUnionRel union = call.rel(0); |
| return (union.isDistinct() && union.isHomogeneous(false /* don't compare names */)); |
| } |
| |
| @Override |
| public void onMatch(RelOptRuleCall call) { |
| final DrillUnionRel union = call.rel(0); |
| final List<RelNode> inputs = union.getInputs(); |
| List<RelNode> convertedInputList = Lists.newArrayList(); |
| RelTraitSet traits = call.getPlanner().emptyTraitSet().plus(Prel.DRILL_PHYSICAL); |
| |
| try { |
| for (RelNode input : inputs) { |
| RelNode convertedInput = convert(input, PrelUtil.fixTraits(call, traits)); |
| convertedInputList.add(convertedInput); |
| } |
| |
| traits = call.getPlanner().emptyTraitSet().plus(Prel.DRILL_PHYSICAL).plus(DrillDistributionTrait.SINGLETON); |
| UnionDistinctPrel unionDistinct = |
| new UnionDistinctPrel(union.getCluster(), traits, convertedInputList); |
| |
| call.transformTo(unionDistinct); |
| |
| } catch (InvalidRelException e) { |
| tracer.warn(e.toString()); |
| } |
| } |
| |
| } |