Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/15596#discussion_r84838595
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/WholeStageCodegenExec.scala
---
@@ -298,6 +298,12 @@ case class WholeStageCodegenExec(child: SparkPlan)
extends UnaryExecNode with Co
override def outputPartitioning: Partitioning = child.outputPartitioning
override def outputOrdering: Seq[SortOrder] = child.outputOrdering
+ override def executeCollect(): Array[InternalRow] = child match {
+ // This happens when the user is collecting results back to the
driver, we could skip
+ // the shuffling and scan increasingly the RDD to get the limited
items.
+ case g: GlobalLimitExec => g.executeCollect()
--- End diff --
this is really confusing ...
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