| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Merlin Moncure <mmoncure(at)gmail(dot)com> |
| Cc: | Bruce Momjian <bruce(at)momjian(dot)us>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Shigeru Hanada <shigeru(dot)hanada(at)gmail(dot)com>, Kohei KaiGai <kaigai(at)kaigai(dot)gr(dot)jp>, Denis Lussier <denis(dot)lussier(at)openscg(dot)com> |
| Subject: | Re: Status of FDW pushdowns |
| Date: | 2013-11-21 15:46:14 |
| Message-ID: | 23409.1385048774@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Merlin Moncure <mmoncure(at)gmail(dot)com> writes:
> On Thu, Nov 21, 2013 at 9:05 AM, Bruce Momjian <bruce(at)momjian(dot)us> wrote:
>> I know join pushdowns seem insignificant, but it helps to restrict what
>> data must be passed back because you would only pass back joined rows.
> By 'insignificant' you mean 'necessary to do any non-trivial real
> work'. Personally, I'd prefer it if FDW was extended to allow
> arbitrary parameterized queries like every other database connectivity
> API ever made ever.
[ shrug... ] So use dblink. For better or worse, the FDW stuff is
following the SQL standard's SQL/MED design, which does not do it
like that.
regards, tom lane
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