Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/7343#issuecomment-120814537
That's correct, `complex group by keys` is the expression other than
`AttributeReference`s.
I am not just simply change the group by keys, but with an alias. e.g.
```
SELECT key+key FROM src GROUP BY key+key WITH ROLLUP
==>
SELECT k FROM (SELECT key + key as k FROM src) t GROUP BY k WITH ROLLUP
```
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