On Mon, Mar 29, 2010 at 12:17 PM, Tom Lane <t...@sss.pgh.pa.us> wrote: > Robert Haas <robertmh...@gmail.com> writes: >> On Mon, Mar 29, 2010 at 12:03 PM, Greg Smith <g...@2ndquadrant.com> wrote: >>> at the top of my list in this area for 9.1 is to track down the rumored >>> patch that exports information about the rejected plans considered and get >>> that comitted. That always seems what I want to look at for answering the >>> question "why this plan instead of what I was expecting?" > >> Having looked at that patch, I am skeptical of it, but we can >> certainly take a fresh look. > > The problem with this line of thought is that it imagines you can look > at worked-out alternative plans. You can't, because the planner doesn't > pursue rejected alternatives that far (and you'd not want to wait long > enough for it to do so...)
Right. And that's not what the patch did. But a detailed discussion of this topic should be (a) conducted on a separate thread and (b) occur after we've all refamiliarized ourselves with it. ...Robert -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
