Robert Haas <robertmh...@gmail.com> writes: > for estimate_worstcase_fraction. So, when computing the cost of a > path, we'd compute our current expected-case estimate, and also a > worst-case estimate, and then compute the final cost as:
There also was the idea for the executor to be able to handle alternate plans and some heuristic to determine that the actual cost of running a plan is much higher than what's been estimated, so much so as to switch to starting from scratch with the other plan instead. Regards, -- Dimitri Fontaine http://2ndQuadrant.fr PostgreSQL : Expertise, Formation et Support -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
