The NOT NULL strength reduction optimization from [de9c86c9e4cdb34f] should

The NOT NULL strength reduction optimization from [de9c86c9e4cdb34f] should
be applied to the WHERE clause only.  Otherwise, the operand of the IS NULL
or IS NOT NULL operator might be a reference to a bare column of an
aggregate table, and we can't tell if it is NULL or not based only on its
NOT NULL attribute.  [forum:/forumpost/440f2a2f17|Forum post 440f2a2f17].

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