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[Enhancement] Push down topn with left and right outer join (StarRock…
…s#30128) Signed-off-by: stephen <stephen5217@163.com>
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...n/java/com/starrocks/sql/optimizer/rule/transformation/OuterJoinAddRedundantTopNRule.java
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| // Copyright 2021-present StarRocks, Inc. All rights reserved. | ||
| // | ||
| // Licensed 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 | ||
| // | ||
| // https://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 com.starrocks.sql.optimizer.rule.transformation; | ||
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| import com.google.common.collect.Lists; | ||
| import com.starrocks.analysis.JoinOperator; | ||
| import com.starrocks.sql.optimizer.OptExpression; | ||
| import com.starrocks.sql.optimizer.OptimizerContext; | ||
| import com.starrocks.sql.optimizer.base.Ordering; | ||
| import com.starrocks.sql.optimizer.operator.OperatorType; | ||
| import com.starrocks.sql.optimizer.operator.logical.LogicalJoinOperator; | ||
| import com.starrocks.sql.optimizer.operator.logical.LogicalTopNOperator; | ||
| import com.starrocks.sql.optimizer.operator.pattern.Pattern; | ||
| import com.starrocks.sql.optimizer.operator.scalar.ColumnRefOperator; | ||
| import com.starrocks.sql.optimizer.rule.RuleType; | ||
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|
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| import java.util.Collections; | ||
| import java.util.List; | ||
| import java.util.stream.Collectors; | ||
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| public class OuterJoinAddRedundantTopNRule extends TransformationRule { | ||
| public OuterJoinAddRedundantTopNRule() { | ||
| super(RuleType.TF_PUSH_DOWN_TOPN_OUTER_JOIN, | ||
| Pattern.create(OperatorType.LOGICAL_TOPN).addChildren( | ||
| Pattern.create(OperatorType.LOGICAL_JOIN, OperatorType.PATTERN_LEAF, OperatorType.PATTERN_LEAF))); | ||
| } | ||
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| @Override | ||
| public boolean check(OptExpression input, OptimizerContext context) { | ||
| LogicalTopNOperator topn = (LogicalTopNOperator) input.getOp(); | ||
|
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| if (topn.getLimit() > context.getSessionVariable().getCboPushDownTopNLimit()) { | ||
| return false; | ||
| } | ||
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| OptExpression childExpr = input.inputAt(0); | ||
| LogicalJoinOperator joinOperator = childExpr.getOp().cast(); | ||
| JoinOperator joinType = joinOperator.getJoinType(); | ||
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| if (!joinType.isLeftOuterJoin() && !joinType.isRightOuterJoin()) { | ||
| return false; | ||
| } | ||
|
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| if (joinOperator.getPredicate() != null) { | ||
| return false; | ||
| } | ||
|
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| OptExpression joinChild = null; | ||
| if (joinType.isLeftOuterJoin()) { | ||
| joinChild = childExpr.inputAt(0); | ||
| } else if (joinType.isRightJoin()) { | ||
| joinChild = childExpr.inputAt(1); | ||
| } | ||
|
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| if (topn.hasLimit() && joinChild.getOp().hasLimit() && topn.getLimit() >= joinChild.getOp().getLimit()) { | ||
| return false; | ||
| } | ||
|
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| List<Integer> colIds = topn.getOrderByElements().stream() | ||
| .map(Ordering::getColumnRef) | ||
| .map(ColumnRefOperator::getId) | ||
| .collect(Collectors.toList()); | ||
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| return joinChild.getOutputColumns().containsAll(colIds); | ||
| } | ||
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| @Override | ||
| public List<OptExpression> transform(OptExpression input, OptimizerContext context) { | ||
| LogicalTopNOperator topn = input.getOp().cast(); | ||
| OptExpression childExpr = input.inputAt(0); | ||
| LogicalJoinOperator joinOperator = childExpr.getOp().cast(); | ||
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| OptExpression joinChildWithSort; | ||
| if (joinOperator.getJoinType().isLeftOuterJoin()) { | ||
| joinChildWithSort = childExpr.inputAt(0); | ||
| } else { | ||
| joinChildWithSort = childExpr.inputAt(1); | ||
| } | ||
|
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| OptExpression newTopNOperator = OptExpression.create(new LogicalTopNOperator.Builder() | ||
| .setOrderByElements(topn.getOrderByElements()) | ||
| .setLimit(topn.getLimit()) | ||
| .setTopNType(topn.getTopNType()) | ||
| .setSortPhase(topn.getSortPhase()) | ||
| .setIsSplit(false) | ||
| .build(), joinChildWithSort); | ||
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| OptExpression newJoinOperator; | ||
| if (joinOperator.getJoinType().isLeftOuterJoin()) { | ||
| newJoinOperator = OptExpression.create(joinOperator, | ||
| Lists.newArrayList(newTopNOperator, childExpr.inputAt(1))); | ||
| } else { | ||
| newJoinOperator = OptExpression.create(joinOperator, | ||
| Lists.newArrayList(childExpr.inputAt(0), newTopNOperator)); | ||
| } | ||
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| return Collections.singletonList(OptExpression.create(topn, newJoinOperator)); | ||
| } | ||
| } |
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