Github user hhbyyh commented on the issue:
https://github.com/apache/spark/pull/18902
Thanks for the quick update. The implementation may be improved on some
details. But first I'd want to confirm the "convert to null" method does not
have any defect.
@MLnick @srowen @yanboliang
And we may need more unit tests to constantly monitor the SQL behavior
(avg and stat) on null.
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