Github user tianyi commented on the pull request:
https://github.com/apache/spark/pull/2542#issuecomment-57074276
@cloud-fan, I think it is reasonable for return "ambiguous references" in
the case you mentioned, because we can't make sure whether 'a' is a table alias
or column name. In my last commits, spark will return "ambiguous references"
for your case.
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