Github user hvanhovell commented on the issue:
https://github.com/apache/spark/pull/15317
@dongjoon-hyun I think I have forgotten a case. We are allowed to use
multi-level sorted range frames, if we collapse these windows we will end with
the wrong result. For instance:
```
sum(a) over (partition by a order by b, c range between unbounded preceding
and current row)
sum(a) over (partition by a order by b range between unbounded preceding
and current row)
```
Have different outcomes.
We could fix this, but this would require us rewrite parts of the
WindowExec operator.
Could you revert the changes? I am sorry about that!
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