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postgres-lambda-diff

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    Fix an oversight I introduced on 2003-12-28: find_nots/push_nots should
    Tom Lane authored 
    continue to recurse after eliminating a NOT-below-a-NOT, since the
contained subexpression will now be part of the top-level AND/OR structure
and so deserves to be simplified.  The real-world impact of this is
probably minimal, since it'd require at least three levels of NOT to make
a difference, but it's still a bug.
Also remove some redundant tests for NULL subexpressions.
    284e4739
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    user avatar 284e4739
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