Обсуждение: Foreign server version and type

On 15.08.2011 19:58, Thom Brown wrote:
> I'm looking at the CREATE SERVER page on the documentation (
> http://www.postgresql.org/docs/9.1/static/sql-createserver.html) and noticed
> that there's a server_version parameter which can be provided with the
> keyword VERSION and server_type specified after TYPE.
>
> However, there's zero information about what these are used for, whether
> they have any bearing on anything or why you'd want to use them.  Are these
> parameters used for anything, or are they purely for future functionality?
>   Whatever the case, could some kind of elaboration be added to justify the
> existence of these options?  They have been in the docs since the CREATE
> SERVER syntax was introduced in 8.4.

It's in the SQL spec. It isn't used anything by PostgreSQL itself, but a
wrapper could look at it. It would probably be good to say that
explicitly in the docs.

--
   Heikki Linnakangas
   EnterpriseDB   http://www.enterprisedb.com

On Mon, Aug 15, 2011 at 08:36:36PM +0300, Heikki Linnakangas wrote:
> On 15.08.2011 19:58, Thom Brown wrote:
> >I'm looking at the CREATE SERVER page on the documentation (
> >http://www.postgresql.org/docs/9.1/static/sql-createserver.html) and noticed
> >that there's a server_version parameter which can be provided with the
> >keyword VERSION and server_type specified after TYPE.
> >
> >However, there's zero information about what these are used for, whether
> >they have any bearing on anything or why you'd want to use them.  Are these
> >parameters used for anything, or are they purely for future functionality?
> >  Whatever the case, could some kind of elaboration be added to justify the
> >existence of these options?  They have been in the docs since the CREATE
> >SERVER syntax was introduced in 8.4.
>
> It's in the SQL spec. It isn't used anything by PostgreSQL itself,
> but a wrapper could look at it. It would probably be good to say
> that explicitly in the docs.

I have applied the attached patch to document that these fields are only
potentially useful to foreign data wrappers.

--
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + It's impossible for everything to be true. +

On 15 August 2012 16:47, Bruce Momjian <bruce@momjian.us> wrote:
> On Mon, Aug 15, 2011 at 08:36:36PM +0300, Heikki Linnakangas wrote:
>> On 15.08.2011 19:58, Thom Brown wrote:
>> >I'm looking at the CREATE SERVER page on the documentation (
>> >http://www.postgresql.org/docs/9.1/static/sql-createserver.html) and noticed
>> >that there's a server_version parameter which can be provided with the
>> >keyword VERSION and server_type specified after TYPE.
>> >
>> >However, there's zero information about what these are used for, whether
>> >they have any bearing on anything or why you'd want to use them.  Are these
>> >parameters used for anything, or are they purely for future functionality?
>> >  Whatever the case, could some kind of elaboration be added to justify the
>> >existence of these options?  They have been in the docs since the CREATE
>> >SERVER syntax was introduced in 8.4.
>>
>> It's in the SQL spec. It isn't used anything by PostgreSQL itself,
>> but a wrapper could look at it. It would probably be good to say
>> that explicitly in the docs.
>
> I have applied the attached patch to document that these fields are only
> potentially useful to foreign data wrappers.

Thanks Bruce, and a very belated thanks to Heikki for the explanation.

--
Thom