Github user aokolnychyi commented on the issue:
https://github.com/apache/spark/pull/19193
@hvanhovell @cloud-fan I think it would be safer to be consistent with
other databases and what Spark does for nested aggregate functions. It is
really simple to write a subquery to work around any problems.
As it is right now, Scenario 2 mentioned above gives a wrong result and
Scenario 4 should be double-checked if we want to support nested window
functions.
Let me known your opinion.
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