Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/10731#issuecomment-198009418
One question, if I have
```
table1: a: int, b: int, c: int
SELECT b, c FROM table1 ORDER BY 1, 2
```
what are columns used in ORDER BY? I guess `b, c`, right?
For GROUP BY, I feel it is not always obvious what are columns referred by
the positions (I mean not as obvious as ORDER BY). What do you think?
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