| /* |
| * 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.beam.sdk.extensions.sql.impl.rule; |
| |
| import org.apache.beam.sdk.extensions.sql.impl.rel.BeamLogicalConvention; |
| import org.apache.beam.sdk.extensions.sql.impl.rel.BeamSortRel; |
| import org.apache.calcite.plan.Convention; |
| import org.apache.calcite.rel.RelNode; |
| import org.apache.calcite.rel.convert.ConverterRule; |
| import org.apache.calcite.rel.core.Sort; |
| import org.apache.calcite.rel.logical.LogicalSort; |
| |
| /** {@code ConverterRule} to replace {@code Sort} with {@code BeamSortRel}. */ |
| public class BeamSortRule extends ConverterRule { |
| public static final BeamSortRule INSTANCE = new BeamSortRule(); |
| |
| private BeamSortRule() { |
| super(LogicalSort.class, Convention.NONE, BeamLogicalConvention.INSTANCE, "BeamSortRule"); |
| } |
| |
| @Override |
| public RelNode convert(RelNode rel) { |
| Sort sort = (Sort) rel; |
| final RelNode input = sort.getInput(); |
| return new BeamSortRel( |
| sort.getCluster(), |
| sort.getTraitSet().replace(BeamLogicalConvention.INSTANCE), |
| convert(input, input.getTraitSet().replace(BeamLogicalConvention.INSTANCE)), |
| sort.getCollation(), |
| sort.offset, |
| sort.fetch); |
| } |
| } |