Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/10678#issuecomment-170830746
I found the sorting columns could be partially resolved by different nodes.
For example,
```select a.c1, b.c2 from t1 a, t1 b order by b.c3, a.c3```
I need extra time to write the fix. It becomes more complex than what I
thought.
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