findepi opened a new pull request, #11256:
URL: https://github.com/apache/datafusion/pull/11256
`count([DISTINCT] [expr])` aggregate function never returns null. Infer
non-nullness of such aggregate expression. This allows elimination of the
HAVING filter for a query such as
SELECT ... count(*) AS c
FROM ...
GROUP BY ...
HAVING c IS NOT NULL
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