maropu commented on a change in pull request #29677:
URL: https://github.com/apache/spark/pull/29677#discussion_r484875247
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/exchange/EnsureRequirements.scala
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@@ -52,7 +52,8 @@ case class EnsureRequirements(conf: SQLConf) extends
Rule[SparkPlan] {
case (child, distribution) =>
val numPartitions = distribution.requiredNumPartitions
.getOrElse(conf.numShufflePartitions)
- ShuffleExchangeExec(distribution.createPartitioning(numPartitions),
child)
+ val newChild = if (child.isInstanceOf[ShuffleExchangeExec])
child.children.head else child
Review comment:
Could you add some comments about why we can remove it?
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