xzj7019 commented on code in PR #28486: URL: https://github.com/apache/doris/pull/28486#discussion_r1432647239
########## fe/fe-core/src/main/java/org/apache/doris/nereids/rules/rewrite/EliminateJoinByFK.java: ########## @@ -0,0 +1,333 @@ +// 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.doris.nereids.rules.rewrite; + +import org.apache.doris.catalog.Column; +import org.apache.doris.catalog.Table; +import org.apache.doris.catalog.TableIf; +import org.apache.doris.nereids.jobs.JobContext; +import org.apache.doris.nereids.trees.expressions.Alias; +import org.apache.doris.nereids.trees.expressions.Expression; +import org.apache.doris.nereids.trees.expressions.IsNull; +import org.apache.doris.nereids.trees.expressions.NamedExpression; +import org.apache.doris.nereids.trees.expressions.Not; +import org.apache.doris.nereids.trees.expressions.Slot; +import org.apache.doris.nereids.trees.expressions.SlotReference; +import org.apache.doris.nereids.trees.expressions.functions.ExpressionTrait; +import org.apache.doris.nereids.trees.plans.Plan; +import org.apache.doris.nereids.trees.plans.logical.LogicalAggregate; +import org.apache.doris.nereids.trees.plans.logical.LogicalCatalogRelation; +import org.apache.doris.nereids.trees.plans.logical.LogicalFilter; +import org.apache.doris.nereids.trees.plans.logical.LogicalJoin; +import org.apache.doris.nereids.trees.plans.logical.LogicalLimit; +import org.apache.doris.nereids.trees.plans.logical.LogicalProject; +import org.apache.doris.nereids.trees.plans.logical.LogicalRelation; +import org.apache.doris.nereids.trees.plans.logical.LogicalSort; +import org.apache.doris.nereids.trees.plans.logical.LogicalTopN; +import org.apache.doris.nereids.trees.plans.logical.LogicalWindow; +import org.apache.doris.nereids.trees.plans.visitor.CustomRewriter; +import org.apache.doris.nereids.trees.plans.visitor.DefaultPlanRewriter; +import org.apache.doris.nereids.util.ImmutableEquivalenceSet; + +import com.google.common.collect.BiMap; +import com.google.common.collect.ImmutableList; +import com.google.common.collect.ImmutableMap; +import com.google.common.collect.ImmutableMap.Builder; +import com.google.common.collect.ImmutableSet; +import com.google.common.collect.Sets; + +import java.util.HashMap; +import java.util.HashSet; +import java.util.List; +import java.util.Map; +import java.util.Map.Entry; +import java.util.Set; +import java.util.stream.Collectors; +import javax.annotation.Nullable; + +/** + * Eliminate join by foreign. + */ +public class EliminateJoinByFK extends DefaultPlanRewriter<JobContext> implements CustomRewriter { + @Override + public Plan rewriteRoot(Plan plan, JobContext jobContext) { + EliminateJoinByFKHelper helper = new EliminateJoinByFKHelper(); + return helper.rewriteRoot(plan, jobContext); + } + + private static class EliminateJoinByFKHelper + extends DefaultPlanRewriter<ForeignKeyContext> implements CustomRewriter { + + @Override + public Plan rewriteRoot(Plan plan, JobContext jobContext) { + return plan.accept(this, new ForeignKeyContext()); + } + + @Override + public Plan visit(Plan plan, ForeignKeyContext context) { + Plan newPlan = visitChildren(this, plan, context); + context.passThroughPlan(plan); + return newPlan; + } + + @Override + public Plan visitLogicalRelation(LogicalRelation relation, ForeignKeyContext context) { + if (!(relation instanceof LogicalCatalogRelation)) { + return relation; + } + if (!(((LogicalCatalogRelation) relation).getTable() instanceof Table)) { + return relation; + } + context.putAllForeignKeys(((LogicalCatalogRelation) relation).getTable()); + relation.getOutput().stream() + .filter(SlotReference.class::isInstance) + .map(SlotReference.class::cast) + .forEach(context::putSlot); + return relation; + } + + private boolean canEliminate(LogicalJoin<?, ?> join, BiMap<Slot, Slot> equalSlots, ForeignKeyContext context) { + if (!join.getOtherJoinConjuncts().isEmpty()) { + return false; + } + if (!join.getJoinType().isInnerJoin() && !join.getJoinType().isSemiJoin()) { + return false; + } + return context.satisfyConstraint(equalSlots, join); + } + + private boolean isForeignKeyAndUnique(Plan plan, + Set<Slot> keySet, ForeignKeyContext context) { + boolean unique = keySet.stream() + .allMatch(s -> plan.getLogicalProperties().getFunctionalDependencies().isUnique(s)); + return unique && context.isForeignKey(keySet); + } + + private @Nullable Map<Expression, Expression> tryGetOutputToChildMap(Plan child, + Set<Slot> output, BiMap<Slot, Slot> equalSlots) { + Set<Slot> residual = Sets.difference(output, child.getOutputSet()); + if (equalSlots.keySet().containsAll(residual)) { + return residual.stream() + .collect(ImmutableMap.toImmutableMap(e -> e, equalSlots::get)); + } + if (equalSlots.values().containsAll(residual)) { + return residual.stream() + .collect(ImmutableMap.toImmutableMap(e -> e, e -> equalSlots.inverse().get(e))); + } + return null; + } + + private Plan applyNullCompensationFilter(Plan child, Set<Slot> childSlots) { + Set<Expression> predicates = childSlots.stream() + .filter(ExpressionTrait::nullable) + .map(s -> new Not(new IsNull(s))) + .collect(ImmutableSet.toImmutableSet()); + if (predicates.isEmpty()) { + return child; + } + return new LogicalFilter<>(predicates, child); + } + + private @Nullable Plan tryConstructPlanWithJoinChild(LogicalProject<LogicalJoin<?, ?>> project, Plan child, + BiMap<Slot, Slot> equalSlots, ForeignKeyContext context) { + Set<Slot> output = project.getInputSlots(); + Set<Slot> keySet = child.getOutputSet().containsAll(equalSlots.keySet()) + ? equalSlots.keySet() + : equalSlots.values(); + Map<Expression, Expression> outputToRight = tryGetOutputToChildMap(child, output, equalSlots); + if (outputToRight != null && isForeignKeyAndUnique(child, keySet, context)) { Review Comment: unique is not necessary -- This is an automated message from the Apache Git Service. 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