| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Etsuro Fujita <fujita(dot)etsuro(at)lab(dot)ntt(dot)co(dot)jp>, Jim Nasby <Jim(dot)Nasby(at)BlueTreble(dot)com>, Kyotaro HORIGUCHI <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp>, ashutosh(dot)bapat(at)enterprisedb(dot)com, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: [HACKERS] EvalPlanQual behaves oddly for FDW queries involving system columns |
| Date: | 2019-02-27 20:33:06 |
| Message-ID: | 20190227203306.wpwjvwn7nckeuvx7@alap3.anarazel.de |
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| Lists: | pgsql-hackers |
Hi,
On 2015-05-12 14:24:34 -0400, Tom Lane wrote:
> I did a very basic update of your postgres_fdw patch to test this with,
> and attach that so that you don't have to repeat the effort. I'm not sure
> whether we want to try to convert that into something committable. I'm
> afraid that the extra round trips involved in doing row locking this way
> will be so expensive that no one really wants it for postgres_fdw. It's
> more credible that FDWs operating against local storage would have use
> for it.
Fujita-san, do you know of any FDWs that use this? I'm currently
converting the EPQ machinery to slots, and in course of that I (with
Horiguchi-san's help), converted RefetchForeignRow to return a slot. But
there's currently no in-core user of this facility... I guess I can
rebase the preliminary postgres_fdw patch here, but it bitrotted
significantly. I also feel like there should be some test coverage for
an API in a nontrivial part of the code...
Greetings,
Andres Freund
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