Tom Lane wrote: > With the fix I was just about to apply, all four cases give the first > set of results. This clearly satisfies the principle of least > astonishment, at least more nearly than what we have; but it equally > clearly is *not* going to restore 8.4 to work just like 8.3.
Right, 8.3 had the same underlying problem, 8.4 just makes it more visible as it's better at flattening subqueries. > I'm inclined to apply the patch to 8.4 anyway, because it seems like a > bug fix. I would consider patching further back except there's no > chance of making it work in older branches, at least not without > destabilizing them quite a bit (the PlaceHolderVar mechanism would have > to be back-ported). > > It might be possible to fix the older branches by not flattening > subqueries that have whole-row references; but even that would take > nontrivial work, and it'd be sacrificing performance to fix a corner > case no one has previously complained about. So I'm leaning to patching > 8.4 and leaving the older branches alone. > > Thoughts? Seems reasonable. -- Heikki Linnakangas EnterpriseDB http://www.enterprisedb.com -- Sent via pgsql-bugs mailing list (pgsql-bugs@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-bugs
