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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