Github user JoshRosen commented on a diff in the pull request: https://github.com/apache/spark/pull/11403#discussion_r55438073 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/exchange/ShuffleExchange.scala --- @@ -103,16 +101,25 @@ case class ShuffleExchange( new ShuffledRowRDD(shuffleDependency, specifiedPartitionStartIndices) } + /** + * Caches the created ShuffleRowRDD so we can reuse that. + */ + private var shuffleRDD: ShuffledRowRDD = null + protected override def doExecute(): RDD[InternalRow] = attachTree(this, "execute") { --- End diff -- Naive question, but do we need to cache the result after the `attachTree`?
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