Github user windpiger commented on the issue: https://github.com/apache/spark/pull/15668 @hvanhovell @cloud-fan Do you mean that just change distinctAggChildren/regularAggChildren to represent the unfoldable expressions, and then the followings code could be unchanged? ... val distinctAggChildren = distinctAggGroups.keySet.flatten.toSeq.distinct.**filter(!_.foldable)** ... val regularAggChildren = regularAggExprs.flatMap(\_.aggregateFunction.children).distinct.**filter(!_.foldable)**
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