On Fri, Oct 21, 2011 at 3:55 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Robert Haas <robertmhaas@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