Jim Nasby <jim.na...@bluetreble.com> writes:
> Is there any reason we couldn't/shouldn't support IS DISTINCT in 
> subquery_Op? (Or really, just add support to ANY()/ALL()/(SELECT ...)?)

It's not an operator (in the sense of something with a pg_operator OID),
which means this would be quite a bit less than trivial as far as internal
representation/implementation goes.  I'm not sure if there would be
grammar issues, either.

                        regards, tom lane

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