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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