Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/5189#issuecomment-86803347
Ah, so `SELECT a.b` is equal to `SELECT a.b AS b`, and the `b` in `ORDER BY
b` should reference to `a.b`, that's how hive does resolution and makes sense.
I have sent you a PR to remove the duplicated `resolveGetField` and others LGTM.
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