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[feature](Nereids): push down topN through join apache#24720 (apache#…
…26634) Push TopN through Join. JoinType just can be left/right outer join or cross join, because data of their one child can't be filtered. new TopN is (original limit + original offset, 0) as limit and offset. (cherry picked from commit 3c9ff7a)
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fe/fe-core/src/main/java/org/apache/doris/nereids/rules/rewrite/PushdownTopNThroughJoin.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| // 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. | ||
|
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| package org.apache.doris.nereids.rules.rewrite; | ||
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| import org.apache.doris.nereids.properties.OrderKey; | ||
| import org.apache.doris.nereids.rules.Rule; | ||
| import org.apache.doris.nereids.rules.RuleType; | ||
| import org.apache.doris.nereids.trees.expressions.Slot; | ||
| import org.apache.doris.nereids.trees.plans.Plan; | ||
| import org.apache.doris.nereids.trees.plans.logical.LogicalJoin; | ||
| import org.apache.doris.nereids.trees.plans.logical.LogicalProject; | ||
| import org.apache.doris.nereids.trees.plans.logical.LogicalTopN; | ||
| import org.apache.doris.nereids.util.Utils; | ||
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|
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| import com.google.common.collect.ImmutableList; | ||
|
|
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| import java.util.List; | ||
| import java.util.Set; | ||
| import java.util.stream.Collectors; | ||
|
|
||
| /** | ||
| * Push down TopN through Outer Join into left child ..... | ||
| */ | ||
| public class PushdownTopNThroughJoin implements RewriteRuleFactory { | ||
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| @Override | ||
| public List<Rule> buildRules() { | ||
| return ImmutableList.of( | ||
| // topN -> join | ||
| logicalTopN(logicalJoin()) | ||
| // TODO: complex orderby | ||
| .when(topN -> topN.getOrderKeys().stream().map(OrderKey::getExpr) | ||
| .allMatch(Slot.class::isInstance)) | ||
| .then(topN -> { | ||
| LogicalJoin<Plan, Plan> join = topN.child(); | ||
| Plan newJoin = pushLimitThroughJoin(topN, join); | ||
| if (newJoin == null || topN.child().children().equals(newJoin.children())) { | ||
| return null; | ||
| } | ||
| return topN.withChildren(newJoin); | ||
| }) | ||
| .toRule(RuleType.PUSH_TOP_N_THROUGH_JOIN), | ||
|
|
||
| // topN -> project -> join | ||
| logicalTopN(logicalProject(logicalJoin())) | ||
| .when(topN -> topN.getOrderKeys().stream().map(OrderKey::getExpr) | ||
| .allMatch(Slot.class::isInstance)) | ||
| .then(topN -> { | ||
| LogicalProject<LogicalJoin<Plan, Plan>> project = topN.child(); | ||
| LogicalJoin<Plan, Plan> join = project.child(); | ||
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| // If orderby exprs aren't all in the output of the project, we can't push down. | ||
| // topN(order by: slot(a+1)) | ||
| // - project(a+1, b) | ||
| // TODO: in the future, we also can push down it. | ||
| Set<Slot> outputSet = project.child().getOutputSet(); | ||
| if (!topN.getOrderKeys().stream().map(OrderKey::getExpr) | ||
| .flatMap(e -> e.getInputSlots().stream()) | ||
| .allMatch(outputSet::contains)) { | ||
| return null; | ||
| } | ||
|
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| Plan newJoin = pushLimitThroughJoin(topN, join); | ||
| if (newJoin == null || join.children().equals(newJoin.children())) { | ||
| return null; | ||
| } | ||
| return topN.withChildren(project.withChildren(newJoin)); | ||
| }).toRule(RuleType.PUSH_TOP_N_THROUGH_PROJECT_JOIN) | ||
| ); | ||
| } | ||
|
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||
| private Plan pushLimitThroughJoin(LogicalTopN<? extends Plan> topN, LogicalJoin<Plan, Plan> join) { | ||
| switch (join.getJoinType()) { | ||
| case LEFT_OUTER_JOIN: | ||
| Set<Slot> rightOutputSet = join.right().getOutputSet(); | ||
| if (topN.getOrderKeys().stream().map(OrderKey::getExpr) | ||
| .anyMatch(e -> Utils.isIntersecting(rightOutputSet, e.getInputSlots()))) { | ||
| return null; | ||
| } | ||
| return join.withChildren(topN.withChildren(join.left()), join.right()); | ||
| case RIGHT_OUTER_JOIN: | ||
| Set<Slot> leftOutputSet = join.left().getOutputSet(); | ||
| if (topN.getOrderKeys().stream().map(OrderKey::getExpr) | ||
| .anyMatch(e -> Utils.isIntersecting(leftOutputSet, e.getInputSlots()))) { | ||
| return null; | ||
| } | ||
| return join.withChildren(join.left(), topN.withChildren(join.right())); | ||
| case CROSS_JOIN: | ||
| List<Slot> orderbySlots = topN.getOrderKeys().stream().map(OrderKey::getExpr) | ||
| .flatMap(e -> e.getInputSlots().stream()).collect(Collectors.toList()); | ||
| if (join.left().getOutputSet().containsAll(orderbySlots)) { | ||
| return join.withChildren(topN.withChildren(join.left()), join.right()); | ||
| } else if (join.right().getOutputSet().containsAll(orderbySlots)) { | ||
| return join.withChildren(join.left(), topN.withChildren(join.right())); | ||
| } else { | ||
| return null; | ||
| } | ||
| default: | ||
| // don't push limit. | ||
| return null; | ||
| } | ||
| } | ||
| } |
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