Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/10757#issuecomment-185007809
My last concern is changing default column alias `_c0, _c1, ..` to
`Expression.sql`. Before this PR, query plans generated by SQL string will use
`_c0, _c1, ..`, query plans generated by DataFrame will use `prettyString`. Now
we always use `Expression.sql`, this is more consistent, but will break some
old code, e.g. `select _c1 from (select a + 1, b + 2 from tbl) t `, does it
worth?
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