Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/12719#issuecomment-215618718
`select 1 as a from tbl order by a` is equal to `select 1 as a from tbl
order by 1`.
When the child operator is `Project` and has foldable output, if the parent
operator references the foldable output, we should replace the attribute with
the real foldable expression in `Project`. (and keep the alias to preserve the
naming info)
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