David Rowley <dgrowle...@gmail.com> writes:
> I think we should probably include the logic to test for set returning
> functions into query_is_distinct_for.

It strikes me that there's only a problem if the SRF is in a tlist entry
that is not one of the DISTINCT or GROUP BY columns, respectively.  It
may not be worth the extra complexity to figure that out, though.

                        regards, tom lane

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