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Re: review: FDW API

From: Itagaki Takahiro <itagaki(dot)takahiro(at)gmail(dot)com>
To: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Shigeru HANADA <hanada(at)metrosystems(dot)co(dot)jp>, Jan Urbański <wulczer(at)wulczer(dot)org>, Postgres - Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: review: FDW API
Date: 2011-01-24 08:29:33
Message-ID: AANLkTi=CYoGDTfXhM+zYXyspmLry5itTZsQKE94uUJrU@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-hackers
On Sat, Jan 22, 2011 at 07:20, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> writes:
>> * I wonder if CREATE FOREIGN DATA WRAPPER should automatically create
>> the handler function, if it doesn't exist yet.
>
> Doing that would require the equivalent of pg_pltemplate for FDWs, no?
> I think we're a long way from wanting to do that.  Also, it seems to me
> that add-on FDWs are likely to end up getting packaged as extensions,

The proposed file_fdw.sql actually creates a default FDW on installation.
So I think the installation scripts work as a template even if we don't
have FDW template catalogs.

+ /* contrib/file_fdw/file_fdw.sql.in */
+ -- create wrapper with validator and handler
+ CREATE OR REPLACE FUNCTION file_fdw_validator (text[], oid)
+ CREATE OR REPLACE FUNCTION file_fdw_handler ()
+ CREATE FOREIGN DATA WRAPPER file_fdw
+ VALIDATOR file_fdw_validator HANDLER file_fdw_handler;

-- 
Itagaki Takahiro

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