Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/5358#discussion_r32376603
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/Generate.scala ---
@@ -56,7 +56,8 @@ case class Generate(
val boundGenerator = BindReferences.bindReference(generator,
child.output)
override def execute(): RDD[Row] = {
- if (join) {
+ // #SPARK-6489 do not join when the child has no output
+ if (join && child.output.nonEmpty) {
--- End diff --
This seems unrelated. Also, how is it possible to run a generator when
there is no output?
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