Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/10731#issuecomment-198018058
What you said about order by is right. The most tricky part is `*`. When we
are doing select (*) in DB2, the position number is based on the table
definition in catalog table.
Regarding Group By, I do not know which behavior is right. Different from
Order By, Group By is below Project/SELECT. Thus, personally, I do not know
what is the expected behavior when resolving position number in group by. Just
like, the alias defined in Project/Select cannot be used in Group By.
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