Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19683#discussion_r158716207
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala
---
@@ -115,7 +113,8 @@ case class Generate(
}
def output: Seq[Attribute] = {
- if (join) child.output ++ qualifiedGeneratorOutput else
qualifiedGeneratorOutput
+ if (requiredChildOutput.nonEmpty) child.output ++
qualifiedGeneratorOutput
--- End diff --
This should be `child.output ++ requiredChildOutput`
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