Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/11198#issuecomment-184444684
@davies Besides the issue we discussed above, the latest commit also
resolves another issue. So far, if we could issue an error message like
```Can't add $missingAttrs to $other``` when we are unable to resolve the
missing sort-by columns. However, this is misleading. Users might not be able
to understand how to correct the issue. Thus, after the fix, now, we can get a
better message like ```cannot resolve 'b' in given input columns [a, c, a3]
```.
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