From: | Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> |
---|---|
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>, Ashutosh Bapat <ashutosh(dot)bapat(at)enterprisedb(dot)com>, Ildus Kurbangaliev <i(dot)kurbangaliev(at)postgrespro(dot)ru>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, Robert Haas <robertmhaas(at)gmail(dot)com> |
Subject: | Re: [HACKERS] Bug in ExecModifyTable function and trigger issues for foreign tables |
Date: | 2017-11-27 17:22:00 |
Message-ID: | CAEZATCUvwW4nacdHcaG3E7EaEj6Pqa86FHOuzUEXaahuo10F5g@mail.gmail.com |
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Lists: | pgsql-hackers |
On 27 November 2017 at 16:35, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> I wrote:
>> Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> writes:
>>> A separate point -- it might be marginally more efficient to have the
>>> work of rewriteTargetListUD() done after expand_targetlist() to avoid
>>> the possible renumbering of the resjunk entries.
>
>> Hm. It wouldn't save a lot, but yeah, doing it in this order seems
>> a bit silly when you put it like that.
>
> On looking closer, the reason it's like that in Fujita-san's patch
> is to minimize the API churn seen by FDW AddForeignUpdateTargets
> functions, specifically whether they see a tlist that's before or
> after what expand_targetlist() does. I'm doubtful that the
> potential savings is worth taking risks there. In particular,
> it seems like a good thing that expand_targetlist() verifies the
> correct tlist ordering *after* the FDW function has acted.
> So now my inclination is to leave this alone.
>
Ah yes, that seems like a worthwhile check to keep. Never mind then.
Regards,
Dean
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