Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/17226
> we're not introducing a regression in this PR by fixing the NPE, the
answer given by 1.6 was incorrect under any interpenetration
Right, if it was a bug, then this PR introduces an inconsistency between
optimized one and non-optimized one. We should fix both together or not.
> there is a completely separate issue of what the proper value of count(1)
on no values should be in a pivot that does not depend at all on nulls in the
pivot column.
Then why are we partially fixing a completely separate issue here?
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