Github user NarineK commented on the pull request:
https://github.com/apache/spark/pull/12836#issuecomment-221181147
It seems that many ppl voted for point 2. So, I'll implement 2.
2. function(key, df), where key is a list of grouping column values for
this group, df is the data.frame of the group, containing the grouping columns.
This is similar to the scala function signature for
KeyValueGroupedData.flatMapGroups().
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