>>>>> "David" == David G Johnston <david.g.johns...@gmail.com> writes:
>> 1. x IS NULL is true if and only if x has the null value (isnull set).
David> I don't have a problem conforming to "ROW(NULL, NULL) IS NULL"
David> being true...if you somehow get a hold of something in that
David> form, which your others points address.
This seems harmless, but I think it's not worth the pain.
I'm informed that for example on Oracle:
select case when foo_type(null, null) is null
then 'true' else 'false'
end from dual;
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