Github user dilipbiswal commented on the issue:
https://github.com/apache/spark/pull/13483
@gatorsmile I am not stand for it due to actual use cases, but the API
behavior consistency. If we disallow duplicate group by columns, then we should
do filtering them all. Let
df.groupBy("col1").agg($"col1", $"col1", count("*"))
show duplicate group by columns but disallow
df.groupBy("col1").agg($"col1", count("*"))
looks confusing...
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