Github user maropu commented on the issue:
https://github.com/apache/spark/pull/19473
LGTM. btw, do we have any chance to add the same metrics in
`SortAggregateExec` and `ObjectHashAggregateExec`? It seems we cannot simply
add the metrics in both cuz they use the iterator to aggregate inputs. But, I
think it might help for users.
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