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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