spark ReuseAdaptiveSubquery 源码
spark ReuseAdaptiveSubquery 代码
文件路径：/sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/ReuseAdaptiveSubquery.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,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
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*/
package org.apache.spark.sql.execution.adaptive
import scala.collection.concurrent.TrieMap
import org.apache.spark.sql.catalyst.rules.Rule
import org.apache.spark.sql.catalyst.trees.TreePattern.PLAN_EXPRESSION
import org.apache.spark.sql.execution.{BaseSubqueryExec, ExecSubqueryExpression, ReusedSubqueryExec, SparkPlan}
case class ReuseAdaptiveSubquery(
reuseMap: TrieMap[SparkPlan, BaseSubqueryExec]) extends Rule[SparkPlan] {
def apply(plan: SparkPlan): SparkPlan = {
if (!conf.subqueryReuseEnabled) {
return plan
}
plan.transformAllExpressionsWithPruning(_.containsPattern(PLAN_EXPRESSION)) {
case sub: ExecSubqueryExpression =>
val newPlan = reuseMap.getOrElseUpdate(sub.plan.canonicalized, sub.plan)
if (newPlan.ne(sub.plan)) {
sub.withNewPlan(ReusedSubqueryExec(newPlan))
} else {
sub
}
}
}
}
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