"Jim C. Nasby" <[EMAIL PROTECTED]> writes: > On Fri, Aug 04, 2006 at 02:40:30PM -0400, Tom Lane wrote: >> I would argue that turning on constraint_exclusion ought to instruct >> the planner to catch this sort of thing, whereas when it's off we >> ought not expend the cycles. I have a preliminary patch (below) >> that seems to fix it.
> How many cycles are we talking about here? Is it even worth the GUC? I think so. On simple queries the optimization will *never* fire, and there's no point in doing the search. People who are running complex queries will want to turn it on, but the mysql-equivalent crew will just find it a waste of cycles. regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match