| /* |
| * 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.BeamJoinRel; |
| import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.plan.RelOptRuleCall; |
| import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rel.core.Join; |
| import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rel.core.RelFactories; |
| import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rel.rules.JoinAssociateRule; |
| import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.tools.RelBuilderFactory; |
| |
| /** |
| * This is very similar to {@link |
| * org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rel.rules.JoinAssociateRule}. It only |
| * checks if the resulting condition is supported before transforming. |
| */ |
| public class BeamJoinAssociateRule extends JoinAssociateRule { |
| |
| public static final org.apache.beam.sdk.extensions.sql.impl.rule.BeamJoinAssociateRule INSTANCE = |
| new org.apache.beam.sdk.extensions.sql.impl.rule.BeamJoinAssociateRule( |
| RelFactories.LOGICAL_BUILDER); |
| |
| private BeamJoinAssociateRule(RelBuilderFactory relBuilderFactory) { |
| super(relBuilderFactory); |
| } |
| |
| @Override |
| public void onMatch(final RelOptRuleCall call) { |
| super.onMatch( |
| new JoinRelOptRuleCall( |
| call, |
| rel -> { |
| Join topJoin = (Join) rel; |
| Join bottomJoin = (Join) ((Join) rel).getRight(); |
| return BeamJoinRel.isJoinLegal(topJoin) && BeamJoinRel.isJoinLegal(bottomJoin); |
| })); |
| } |
| } |