Re: Server postgres_fdw "fetch_size" option cannot be updated

On Thu, Dec 28, 2017 at 12:33 PM, Logan Owen <pgsql(at)s1devops(dot)com> wrote:

> Hi everyone,
>
> I'm playing around with postgres_fdw (version 1.0), and ran into an issue
> where I wanted to update the "fetch_size" option on the server level:
>
> sql> CREATE SERVER test_remote FOREIGN DATA WRAPPER postgres_fdw OPTIONS
> (host 'postgres2', dbname 'test', updatable 'false')
> [2017-12-28 10:30:13] completed in 35ms
> sql> ALTER SERVER test_remote OPTIONS (set fetch_size '50')
> [2017-12-28 10:30:26] [42704] ERROR: option "fetch_size" not found
>
> However, I am able to properly set the "fetch_size" when originally
> defining the server:
>
> sql> CREATE SERVER test_remote2 FOREIGN DATA WRAPPER postgres_fdw OPTIONS
> (host 'postgres2', dbname 'test', updatable 'false', fetch_size '50')
> [2017-12-28 10:31:26] completed in 24ms
>
>
You use 'set' only if a value already exists and you wish to change it.
Since no value exists (the default does not count), you just do

ALTER SERVER test_remote OPTIONS (fetch_size '50');

Yes, this is confusing. But it is also documented, and I think it is
required by the SQL/MED standard.

Cheers,

Jeff