| /* |
| * 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 org.apache.calcite.plan.RelOptRuleCall; |
| import org.apache.calcite.plan.RelTraitSet; |
| import org.apache.calcite.rel.RelNode; |
| import org.apache.drill.exec.planner.logical.DrillRel; |
| import org.apache.drill.exec.planner.logical.MetadataHandlerRel; |
| import org.apache.drill.exec.planner.logical.RelOptHelper; |
| |
| public class MetadataHandlerPrule extends Prule { |
| public static final MetadataHandlerPrule INSTANCE = new MetadataHandlerPrule(); |
| |
| public MetadataHandlerPrule() { |
| super(RelOptHelper.any(MetadataHandlerRel.class, DrillRel.DRILL_LOGICAL), |
| "MetadataHandlerPrule"); |
| } |
| |
| @Override |
| public void onMatch(RelOptRuleCall call) { |
| MetadataHandlerRel relNode = call.rel(0); |
| RelNode input = relNode.getInput(); |
| RelTraitSet traits = input.getTraitSet().plus(Prel.DRILL_PHYSICAL).plus(DrillDistributionTrait.SINGLETON); |
| RelNode convertedInput = convert(input, traits); |
| call.transformTo(new MetadataHandlerPrel(relNode.getCluster(), traits, |
| convertedInput, |
| relNode.getContext())); |
| } |
| } |