Github user marmbrus commented on a diff in the pull request: https://github.com/apache/spark/pull/9858#discussion_r48873698 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/SparkStrategies.scala --- @@ -361,8 +361,15 @@ private[sql] abstract class SparkStrategies extends QueryPlanner[SparkPlan] { case r @ logical.Range(start, end, step, numSlices, output) => execution.Range(start, step, numSlices, r.numElements, output) :: Nil case logical.RepartitionByExpression(expressions, child, nPartitions) => - execution.Exchange(HashPartitioning( - expressions, nPartitions.getOrElse(numPartitions)), planLater(child)) :: Nil + val newPartitioning = HashPartitioning(expressions, nPartitions.getOrElse(numPartitions)) + val childPlan = self.sqlContext.planner.planLater(child) + // This is necessary to get the outputPartitioning from EnsureRequirements batch + val executedChildPlan = sqlContext.prepareForExecution.execute(childPlan) --- End diff -- Why is this not just: ```scala val childPlan = planLater(child) ```
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