Github user sun-rui commented on the pull request:
https://github.com/apache/spark/pull/12836#issuecomment-219363641
@NarineK, @shivaram, @felixcheung, for point 3, yes, grouping columns can
still be retrieved from the group data. I just to be consistent with scala API
for flatMapGroups where the scala functions takes
```
f: (K, Iterator[V]) => TraversableOnce[U]
```
let's wait for others' comments:)
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