Github user dilipbiswal commented on the issue:
https://github.com/apache/spark/pull/13483
@gatorsmile Your last example just shows the inconsistency. Given two
different parameters, `$"col1", count("*")` and `count("*")`, you get the same
output. I think this confuses users. In contrast, original API usage has
consistent behavior: group by columns are retained, and when you add group by
columns in `agg` API call, it means you want to add duplicate ones.
Of course, that is my opinion. I am not against this change if others think
it is ok.
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