| /* |
| * 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 java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.calcite.rel.InvalidRelException; |
| import org.apache.calcite.rel.RelNode; |
| import org.apache.calcite.rel.logical.LogicalUnion; |
| import org.apache.calcite.plan.Convention; |
| 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.slf4j.Logger; |
| |
| /** |
| * Rule that converts a {@link LogicalUnion} to a {@link DrillUnionRel}, implemented by a "union" operation. |
| */ |
| public class DrillUnionAllRule extends RelOptRule { |
| public static final RelOptRule INSTANCE = new DrillUnionAllRule(); |
| protected static final Logger tracer = CalciteTrace.getPlannerTracer(); |
| |
| private DrillUnionAllRule() { |
| super(RelOptHelper.any(LogicalUnion.class, Convention.NONE), |
| DrillRelFactories.LOGICAL_BUILDER, "DrillUnionRule"); |
| } |
| |
| @Override |
| public void onMatch(RelOptRuleCall call) { |
| final LogicalUnion union = call.rel(0); |
| |
| // This rule applies to Union-All only |
| if(!union.all) { |
| return; |
| } |
| |
| final RelTraitSet traits = union.getTraitSet().plus(DrillRel.DRILL_LOGICAL); |
| final List<RelNode> convertedInputs = new ArrayList<>(); |
| for (RelNode input : union.getInputs()) { |
| final RelNode convertedInput = convert(input, input.getTraitSet().plus(DrillRel.DRILL_LOGICAL).simplify()); |
| convertedInputs.add(convertedInput); |
| } |
| try { |
| call.transformTo(new DrillUnionRel(union.getCluster(), traits, convertedInputs, union.all, |
| true /* check compatibility */)); |
| } catch (InvalidRelException e) { |
| tracer.warn(e.toString()); |
| } |
| } |
| } |