| /* |
| * 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.Convention; |
| import org.apache.calcite.plan.RelOptRule; |
| import org.apache.calcite.plan.RelOptRuleCall; |
| import org.apache.calcite.plan.RelTraitSet; |
| import org.apache.calcite.rel.RelNode; |
| import org.apache.calcite.rel.logical.LogicalAggregate; |
| |
| /** |
| * Rule that converts an {@link LogicalAggregate} to a {@link DrillAggregateRel}, implemented by a Drill "segment" operation |
| * followed by a "collapseaggregate" operation. |
| */ |
| public class DrillAggregateRule extends RelOptRule { |
| public static final RelOptRule INSTANCE = new DrillAggregateRule(); |
| |
| private DrillAggregateRule() { |
| super( |
| RelOptHelper.some(LogicalAggregate.class, |
| Convention.NONE, RelOptHelper.any(RelNode.class)), |
| DrillRelFactories.LOGICAL_BUILDER, |
| "DrillAggregateRule"); |
| } |
| |
| @Override |
| public void onMatch(RelOptRuleCall call) { |
| final LogicalAggregate aggregate = call.rel(0); |
| final RelNode input = call.rel(1); |
| |
| if (aggregate.containsDistinctCall()) { |
| // currently, don't use this rule if any of the aggregates contains DISTINCT |
| return; |
| } |
| |
| final RelTraitSet traits = aggregate.getTraitSet().plus(DrillRel.DRILL_LOGICAL); |
| final RelNode convertedInput = convert(input, input.getTraitSet().plus(DrillRel.DRILL_LOGICAL).simplify()); |
| call.transformTo(new DrillAggregateRel(aggregate.getCluster(), traits, convertedInput, |
| aggregate.getGroupSet(), aggregate.getGroupSets(), aggregate.getAggCallList())); |
| } |
| } |