Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/12496#discussion_r60282121
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicOperators.scala
---
@@ -516,7 +516,10 @@ private[sql] object Expand {
// groupingId is the last output, here we use the bit mask as the
concrete value for it.
} :+ Literal.create(bitmask, IntegerType)
}
- val output = child.output ++ groupByAttrs :+ gid
+
+ // the `groupByAttrs` has different meaning in `Expand.output`, it
could be the original
+ // grouping expression or null, so here we create new instance of it.
+ val output = child.output ++ groupByAttrs.map(_.newInstance) :+ gid
Expand(projections, output, Project(child.output ++ groupByAliases,
child))
--- End diff --
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