OK, understood, thanks.
On Wed, Jul 18, 2012 at 10:15 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> "James W. Wilson" <jww1066@gmail.com> writes:
>> I'm confused. I thought foreign data wrappers were required to create
>> database links from one Postgresql server to another.
>
> contrib/dblink doesn't require them. It does have an option to use an
> FDW instead of a libpq connection string to specify the connection
> target. I had forgotten that that option got added in 8.4, before we
> had any other working use for FDWs --- so maybe we should rethink the
> decision not to backport this fix?
>
> Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
> Branch: master Release: REL9_1_BR [e356743f3] 2010-11-12 15:29:23 +0200
> Branch: REL9_0_STABLE Release: REL9_0_2 [533073cf2] 2010-11-12 15:30:19 +0200
>
> Add missing support for removing foreign data wrapper / server privileges
> belonging to a user at DROP OWNED BY. Foreign data wrappers and servers
> don't do anything useful yet, which is why no-one has noticed, but since we
> have them, seems prudent to fix this. Per report from Chetan Suttraway.
> Backpatch to 9.0, 8.4 has the same problem but this patch didn't apply
> there so I'm not going to bother.
>
> In the meantime, though, you do not *need* an FDW. dblink worked fine
> for many releases before FDWs existed, and it still does work without
> 'em.
>
> regards, tom lane