Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/7343#issuecomment-120811010
@chenghao-intel Thanks for the update. I find `complex group by keys` is a
confusing term. If I understand correctly, we do not handle expressions other
than `AttributeReference`s, right? Also, with your change, seems we will change
the group by expressions (e.g. from `key % 100` to `key`)? What will happen if
an expression involves multiple columns (e.g. `key1 + key2`)?
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