Github user ala commented on the issue:
https://github.com/apache/spark/pull/19473
@maropu I added aggregate time to `ObjectHashAggregateExec`.
`SortAggregateExec` is a different case. First, because it processes input
gradually, so it's hard to precisely measure the time. And second, because
"aggregate time" is really "time it took to build the hash table", which
doesn't make much sense for sort-based aggregation.
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