Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/9981#issuecomment-161172585
This still looks hacky to me. How about this:
add an extra case in `Column.named` to delay the aliasing job of
`UnresolvedFunction` like
`case func: UnresolvedFunction => UnresolvedAlias(func)`, then in
`Analyzer.ResolveAliases`, we can handle this `UnresolvedAlias` when the
function has been resolved.
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