Github user mgaido91 commented on a diff in the pull request:
https://github.com/apache/spark/pull/20375#discussion_r163547424
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -1303,8 +1303,12 @@ object RemoveLiteralFromGroupExpressions extends
Rule[LogicalPlan] {
*/
object RemoveRepetitionFromGroupExpressions extends Rule[LogicalPlan] {
def apply(plan: LogicalPlan): LogicalPlan = plan transform {
- case a @ Aggregate(grouping, _, _) =>
+ case a @ Aggregate(grouping, _, _) if grouping.nonEmpty =>
--- End diff --
this can be `grouping.length > 1`
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