| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Ashutosh Bapat <ashutosh(dot)bapat(at)enterprisedb(dot)com> |
| Cc: | Kyotaro HORIGUCHI <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Introducing coarse grain parallelism by postgres_fdw. |
| Date: | 2014-08-06 12:08:58 |
| Message-ID: | CA+TgmoZ0udKLs6F1zFG-Uoe6uo7JJJCWOPwQQu0xa2Oq8pE6ig@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, Aug 5, 2014 at 7:05 AM, Ashutosh Bapat
<ashutosh(dot)bapat(at)enterprisedb(dot)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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