(2010/06/04 13:57), Tom Lane wrote: > KaiGai Kohei<kai...@ak.jp.nec.com> writes: >> (2010/06/04 11:55), Robert Haas wrote: >>> A (very) important part of this problem is determining which quals are >>> safe to push down. >>> >> At least, I don't have an idea to distinguish trusted functions from >> others without any additional hints, because we support variable kind >> of PL languages. :( > > The proposal some time back in this thread was to trust all built-in > functions and no others. That's a bit simplistic, no doubt, but it > seems to me to largely solve the performance problem and to do so with > minimal effort. When and if you get to a solution that's committable > with respect to everything else, it might be time to think about > more flexible answers to that particular point. > Although I've not check all the functions within pg_proc.h, it seems to me reasonable assumptions, except for a small number of exception which have side-effects, such as lo_write().
Maybe, we have to shut out a small number of exceptions. However, at least, it seems to me reasonable assumption in this stage. Thanks, -- KaiGai Kohei <kai...@ak.jp.nec.com> -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
