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COUNT(NULL) should always return 0 #8509

Description

@joroKr21

Describe the bug

SELECT count(null) FROM test returns 5, i.e. it counts null as a not-null value.

To Reproduce

Add a test SELECT count(null) FROM test

Expected behavior

It should return 0, same as SELECT count(null::int) FROM test e.g. if we cast the null to another type.

Additional context

Confusing Arrow behaviour (but they will not change it): apache/arrow-rs#4838

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