Github user dilipbiswal commented on the issue:
https://github.com/apache/spark/pull/22047
@cloud-fan please see my comment
[link](https://github.com/apache/spark/pull/22047#issuecomment-411536039). I
had tried to rewrite using max and min as suggested by Herman and Reynold in
the original pr. I was unable to do it when the aggregate is part of the
window.
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