[GitHub] spark pull request: [SPARK-9858][SPARK-9859][SPARK-9861][SQL] Add ...

[yhuai <gi...@git.apache.org>]

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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