Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/6169#issuecomment-102263396
I feel it is hard to fix it. Since we can end up having a chain of `Window`
operators. Probably the best chance is to add those missing columns to the
project list before we extract window expressions and create `Window`
operators. However, I think it requires lots of changes. I guess for now, it
will be good to provide an nice error message and ask the user to add missing
order by expressions back to the select clause (if users really do not want the
order by expressions, put window functions in a sub query and do not project
these expressions in the outer query block). In order to generate the nice
error message, I think we can just detect the pattern of
`sort->project->window` and see if we have missing columns in the sort operator.
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