Re: BUG #15998: query to return a table column list gives error on a missing foreign data wrapper library

Etsuro Fujita <etsuro(dot)fujita(at)gmail(dot)com> writes:
> On Tue, Sep 10, 2019 at 6:46 PM PG Bug reporting form
> <noreply(at)postgresql(dot)org> wrote:
>> Take a postgres database with foreign servers and foreign tables.
>> remove the fdw library.
>> [ Then a query on information_schema.columns ]
>> throws error
>> ERROR: could not access file "$libdir/postgres_fdw": No such file or
>> directory
>>
>> commenting out the case statement
>> CASE WHEN col.is_updatable = 'YES' THEN true ELSE false END AS
>> is_updatable,
>> causes the query to run without error.

> Seems reasonable to me; the is_updatable reference would cause the
> IsForeignRelUpdatable() call for postgres_fdw foreign tables IIUC, so
> removing that would be a workaround for this issue if that works for
> you.

Yeah. Seems like not-a-bug to me: if you inquire about the updatability
of a foreign table, we really can't answer that without consulting
the relevant FDW.

regards, tom lane