Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/7957#issuecomment-128506705
Why not this after analysis?
```scala
plan transformAllExpressions {
case UnresolvedAlias(child) => child
case Alias(child, name) => Alias(child transform { case Alias(c, _) => c
}, name)
}
```
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