On Fri, Oct 21, 2011 at 3:55 PM, Tom Lane <t...@sss.pgh.pa.us> wrote: > Robert Haas <robertmh...@gmail.com> writes: >> Anyhow, here's the scoop. On my desktop machine running F14, running >> SELECT sum(1) FROM pgbench_accounts in a tight loop, 60 s worth of >> oprofile data: > >> 176830 13.0801 postgres postgres >> ExecProject > > Hm, that's weird. In both these cases, I'd have expected that > ExecProject would get optimized away thanks to selection of a physical > tlist for the scan node. Wonder if that got broken ...
If it did, it looks like it wasn't recent. I set up the same test case on my MacBook using REL9_1_STABLE and REL9_0_STABLE and set a breakpoint on ExecProject(). Both back-branches appear to also call ExecProject() for every tuple. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
