Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/4075#issuecomment-70433855
Well, actually it will be widely optimized.
e.g. `SELECT MAX(a), MAX(b) FROM t1 GROUP BY a, b GROUPING SETS (a, b)`
It will produces 2 `GroupExpression`s:
`MAX(Literal(null)), MAX(b)` and MAX(a), MAX(Literal(null))` and eventually
it turns to
`null, MAX(b)` and `MAX(a), null`.
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