spark AdjustShuffleExchangePosition 源码
spark AdjustShuffleExchangePosition 代码
文件路径：/sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/AdjustShuffleExchangePosition.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
* limitations under the License.
*/
package org.apache.spark.sql.execution.adaptive
import org.apache.spark.sql.catalyst.rules.Rule
import org.apache.spark.sql.execution.{DeserializeToObjectExec, SparkPlan}
import org.apache.spark.sql.execution.exchange.ShuffleExchangeLike
/**
* This rule is used to adjust the shuffle exchange with special SparkPlan who
* does not allow a shuffle on top of it.
*/
object AdjustShuffleExchangePosition extends Rule[SparkPlan] {
private def shouldAdjust(plan: SparkPlan): Boolean = plan match {
// `DeserializeToObjectExec` is used by Spark internally e.g. `Dataset.rdd`. It produces
// safe rows and must be root node because SQL operators only accept unsafe rows as input.
// This conflicts with AQE framework since we may add shuffle back during re-optimize
// to preserve the user-specified repartition, so here we adjust the position with shuffle.
case _: DeserializeToObjectExec => true
case _ => false
}
override def apply(plan: SparkPlan): SparkPlan = plan match {
case shuffle: ShuffleExchangeLike if shouldAdjust(shuffle.child) =>
shuffle.child.withNewChildren(shuffle.withNewChildren(shuffle.child.children) :: Nil)
case _ => plan
}
}
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