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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