David Rowley <david.row...@2ndquadrant.com> writes:
> I've attached a version without outer unique.

I looked through this a bit, and the first thing I noticed was it doesn't
touch costsize.c at all.  That seems pretty wrong; it's little help to
have a performance improvement if the planner won't pick the right plan
type.  There were costsize.c changes in there back in April; what happened
to them?

                        regards, tom lane

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