On 2015-07-23 07:48:49 -0700, Paul Ramsey wrote:
> fdw=# ALTER SERVER foreign_server OPTIONS ( extensions 'postgis' );
> ALTER SERVER
> fdw=# ALTER SERVER foreign_server OPTIONS ( extensions 'postgis,seg' );
> ERROR: option "extensions" provided more than once
>
> Once set, an option seems to be effectively immutable.
Add SET to the mix and you should be good. The default is ADD, which
explains the problem.
Greetings,
Andres Freund