Github user aray commented on the issue:
https://github.com/apache/spark/pull/17226
@HyukjinKwon we're not introducing a regression in this PR by fixing the
NPE, the answer given by 1.6 was incorrect under any interpenetration. Again,
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.
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