Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/21754#discussion_r207102873
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/exchange/Exchange.scala
---
@@ -52,6 +52,14 @@ case class ReusedExchangeExec(override val output:
Seq[Attribute], child: Exchan
// Ignore this wrapper for canonicalizing.
override def doCanonicalize(): SparkPlan = child.canonicalized
+ override protected def doPrepare(): Unit = {
+ child match {
+ case shuffleExchange @ ShuffleExchangeExec(_, _, Some(coordinator))
=>
+ coordinator.registerExchange(shuffleExchange)
--- End diff --
Is it bad to fix this in this pr?
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