"Robert Haas" <[EMAIL PROTECTED]> writes: > I can predict that Tom will say that the planning time it would take > to avoid this problem isn't justified by the number of queries that it > would improve.
Took the words right out of my mouth ;-) It would be *possible* to do this sort of thing, but what it would imply is re-planning entire join nests on the strength of assumptions that some additional constraints are available. Right now we only do that for individual inner-side relations. AFAICS extending that to sub-joins would result in an exponential increase in plan time. regards, tom lane -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers