/* * 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.calcite.rel.rules; import org.apache.calcite.plan.Contexts; import org.apache.calcite.plan.RelOptPredicateList; import org.apache.calcite.plan.RelOptRule; import org.apache.calcite.plan.RelOptRuleCall; import org.apache.calcite.rel.RelNode; import org.apache.calcite.rel.core.Join; import org.apache.calcite.rel.core.RelFactories; import org.apache.calcite.rel.metadata.RelMetadataQuery; import org.apache.calcite.rex.RexBuilder; import org.apache.calcite.tools.RelBuilder; import org.apache.calcite.tools.RelBuilderFactory; /** * Planner rule that infers predicates from on a * {@link org.apache.calcite.rel.core.Join} and creates * {@link org.apache.calcite.rel.core.Filter}s if those predicates can be pushed * to its inputs. * * <p>Uses {@link org.apache.calcite.rel.metadata.RelMdPredicates} to infer * the predicates, * returns them in a {@link org.apache.calcite.plan.RelOptPredicateList} * and applies them appropriately. */ public class JoinPushTransitivePredicatesRule extends RelOptRule implements TransformationRule { /** The singleton. */ public static final JoinPushTransitivePredicatesRule INSTANCE = new JoinPushTransitivePredicatesRule(Join.class, RelFactories.LOGICAL_BUILDER); /** Creates a JoinPushTransitivePredicatesRule. */ public JoinPushTransitivePredicatesRule(Class<? extends Join> clazz, RelBuilderFactory relBuilderFactory) { super(operand(clazz, any()), relBuilderFactory, null); } @Deprecated // to be removed before 2.0 public JoinPushTransitivePredicatesRule(Class<? extends Join> clazz, RelFactories.FilterFactory filterFactory) { this(clazz, RelBuilder.proto(Contexts.of(filterFactory))); } @Override public void onMatch(RelOptRuleCall call) { Join join = call.rel(0); final RelMetadataQuery mq = call.getMetadataQuery(); RelOptPredicateList preds = mq.getPulledUpPredicates(join); if (preds.leftInferredPredicates.isEmpty() && preds.rightInferredPredicates.isEmpty()) { return; } final RexBuilder rexBuilder = join.getCluster().getRexBuilder(); final RelBuilder relBuilder = call.builder(); RelNode lChild = join.getLeft(); if (preds.leftInferredPredicates.size() > 0) { RelNode curr = lChild; lChild = relBuilder.push(lChild) .filter(preds.leftInferredPredicates).build(); call.getPlanner().onCopy(curr, lChild); } RelNode rChild = join.getRight(); if (preds.rightInferredPredicates.size() > 0) { RelNode curr = rChild; rChild = relBuilder.push(rChild) .filter(preds.rightInferredPredicates).build(); call.getPlanner().onCopy(curr, rChild); } RelNode newRel = join.copy(join.getTraitSet(), join.getCondition(), lChild, rChild, join.getJoinType(), join.isSemiJoinDone()); call.getPlanner().onCopy(join, newRel); call.transformTo(newRel); } }