Re: Introducing coarse grain parallelism by postgres_fdw. - Mailing list pgsql-hackers

From Robert Haas
Subject Re: Introducing coarse grain parallelism by postgres_fdw.
Date
Msg-id CA+TgmoZ0udKLs6F1zFG-Uoe6uo7JJJCWOPwQQu0xa2Oq8pE6ig@mail.gmail.com
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In response to Re: Introducing coarse grain parallelism by postgres_fdw.  (Ashutosh Bapat <ashutosh.bapat@enterprisedb.com>)
List pgsql-hackers
On Tue, Aug 5, 2014 at 7:05 AM, Ashutosh Bapat
<ashutosh.bapat@enterprisedb.com> wrote:
> There are quite a few members added to the generic Path, Plan structures,
> whose use is is induced only through foreign scans. Each path now stores two
> sets of costs, one with parallelism and one without. The parallel values
> will make sense only when there is a foreign scan, which uses parallelism,
> in the plan tree. So, those costs are maintained unnecessarily or the memory
> for those members is wasted in most of the cases, where the tables involved
> are not foreign.

Yeah, I don't think that's going to be acceptable.

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company



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