David Rowley <dgrowle...@gmail.com> writes:
> Attached is a delta patch between version 1.2 and 1.3, and also a
> completely updated patch.

Just to note that I've started looking at this, and I've detected a rather
significant omission: there's no check that the join operator has anything
to do with the subquery's grouping operator.  I think we need to verify
that they are members of the same opclass, as
relation_has_unique_index_for does.

                        regards, tom lane

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