Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/11050#issuecomment-179388873
@marmbrus Do you still remember the JIRA number or the case? If so, I can
add it into the test cases and verify if the fix works well.
In this PR, `isGenerated` is added to `AttributeReference` and `Alias`.
`AttributeReference` is always resolved. `Alias` is not resolved unless the
child has been resolved, and thus, I think we are unable to skip resolving its
child even if the `Alias` is added by Analyzer. Please correct me if my
understanding is wrong. Thank you!
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