Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/9844#issuecomment-158846201
In
[`ResolveAggregateFunctions`](https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala#L633-L635),
we pick up all `SortOrder`s and put them in aggregate list to resolve them.
However, logically we should only pick unresolved `SortOrder`s as some of them
may already be resolved at
[`ResolveReferences`](https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala#L431-L435).
In your case, the `a` in `order by a, c2` can and only can be resolved in
`ResolveReferences`, so we should skip the `a` in `ResolveAggregateFunctions`.
Does it make sense to you?
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