Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/19436#discussion_r142850005
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/objects.scala ---
@@ -394,7 +394,11 @@ case class FlatMapGroupsInRExec(
override def producedAttributes: AttributeSet =
AttributeSet(outputObjAttr)
override def requiredChildDistribution: Seq[Distribution] =
- ClusteredDistribution(groupingAttributes) :: Nil
+ if (groupingAttributes.isEmpty) {
+ AllTuples :: Nil
--- End diff --
You mean empty grouping attributes == all tuples? Yeah, I think no grouping
attributes means all tuples are in the one group.
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