Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/9276#discussion_r43577777
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/Exchange.scala ---
@@ -129,8 +143,29 @@ case class Exchange(newPartitioning: Partitioning,
child: SparkPlan) extends Una
}
}
- protected override def doExecute(): RDD[InternalRow] = attachTree(this ,
"execute") {
+ override protected def doPrepare(): Unit = {
+ // If an ExchangeCoordinator is needed, we register this Exchange
operator
+ // to the coordinator when we do prepare. It is important to make sure
+ // we register this operator right before the execution instead of
register it
+ // in the constructor.
--- End diff --
Done
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