spark OptimizeOneRowPlan 源码
spark OptimizeOneRowPlan 代码
文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/OptimizeOneRowPlan.scala
/*
* 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,
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package org.apache.spark.sql.catalyst.optimizer
import org.apache.spark.sql.catalyst.expressions.aggregate._
import org.apache.spark.sql.catalyst.plans.logical._
import org.apache.spark.sql.catalyst.rules._
import org.apache.spark.sql.catalyst.trees.TreePattern._
/**
* The rule is applied both normal and AQE Optimizer. It optimizes plan using max rows:
* - if the max rows of the child of sort is less than or equal to 1, remove the sort
* - if the max rows per partition of the child of local sort is less than or equal to 1,
* remove the local sort
* - if the max rows of the child of aggregate is less than or equal to 1 and its child and
* it's grouping only(include the rewritten distinct plan), convert aggregate to project
* - if the max rows of the child of aggregate is less than or equal to 1,
* set distinct to false in all aggregate expression
*/
object OptimizeOneRowPlan extends Rule[LogicalPlan] {
override def apply(plan: LogicalPlan): LogicalPlan = {
plan.transformUpWithPruning(_.containsAnyPattern(SORT, AGGREGATE), ruleId) {
case Sort(_, _, child) if child.maxRows.exists(_ <= 1L) => child
case Sort(_, false, child) if child.maxRowsPerPartition.exists(_ <= 1L) => child
case agg @ Aggregate(_, _, child) if agg.groupOnly && child.maxRows.exists(_ <= 1L) =>
Project(agg.aggregateExpressions, child)
case agg: Aggregate if agg.child.maxRows.exists(_ <= 1L) =>
agg.transformExpressions {
case aggExpr: AggregateExpression if aggExpr.isDistinct =>
aggExpr.copy(isDistinct = false)
}
}
}
}
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