Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/11298#issuecomment-186996652
This PR is an incremental fix based on the previous solution for resolving
missing attributes in Sort. This is not a clean fix, I like. However, to do a
clean fix, we need to rewrite a lot of code in `ResolveSortReferences`. I am
not sure if we should do it. Will explain the issues I hit when resolving this
one.
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