From: | Etsuro Fujita <fujita(dot)etsuro(at)lab(dot)ntt(dot)co(dot)jp> |
---|---|
To: | Rushabh Lathia <rushabh(dot)lathia(at)gmail(dot)com> |
Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Thom Brown <thom(at)linux(dot)com>, Stephen Frost <sfrost(at)snowman(dot)net>, Albe Laurenz <laurenz(dot)albe(at)wien(dot)gv(dot)at>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Shigeru Hanada <shigeru(dot)hanada(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Optimization for updating foreign tables in Postgres FDW |
Date: | 2016-01-28 06:03:42 |
Message-ID: | 56A9AF3E.5020804@lab.ntt.co.jp |
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Lists: | pgsql-hackers |
On 2016/01/27 21:23, Rushabh Lathia wrote:
> If I understood correctly, above documentation means, that if FDW have
> DMLPushdown APIs that is enough. But in reality thats not the case, we
> need ExecForeignInsert, ExecForeignUpdate, or ExecForeignDelete in case
> DML is not pushable.
>
> And here fact is DMLPushdown APIs are optional for FDW, so that if FDW
> don't have DMLPushdown APIs they can still very well perform the DML
> operations using ExecForeignInsert, ExecForeignUpdate, or
> ExecForeignDelete.
I agree with you. I guess I was wrong. sorry.
> So documentation should be like:
>
> If the IsForeignRelUpdatable pointer is set to NULL, foreign tables are
> assumed to be insertable, updatable, or deletable if the FDW provides
> ExecForeignInsert, ExecForeignUpdate, or ExecForeignDelete respectively,
>
> If FDW provides DMLPushdown APIs and the DML are pushable to the foreign
> server, then FDW still needs ExecForeignInsert, ExecForeignUpdate, or
> ExecForeignDelete for the non-pushable DML operation.
>
> What's your opinion ?
I agree that we should add this to the documentation, too.
BTW, if I understand correctly, I think we should also modify
relation_is_updatabale() accordingly. Am I right?
Best regards,
Etsuro Fujita
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