Re: Allow escape in application_name

On Mon, Dec 27, 2021 at 1:40 PM Fujii Masao <masao.fujii@oss.nttdata.com> wrote:
>
>
>
> On 2021/12/27 10:40, kuroda.hayato@fujitsu.com wrote:
> > Dear Fujii-san, Horiguchi-san,
> >
> > I confirmed that the feature was committed but reverted the test.
> > Now I'm checking buildfarm.
>
> Attached is the patch that adds the regression test for postgres_fdw.application_name. Could you review this?
>
> As Horiguchi-san suggested at [1], I split the test into two, and then tweaked them as follows.
>
> 1. Set application_name option of a server option to 'fdw_%d%p'
> 2. Set postgres_fdw.application_name to 'fdw_%a%u%%'
>
> 'fdw_%d%p' and 'fdw_%a%u%%' still may be larger than NAMEDATALEN depending on the regression test environment. To make the test stable even in that case, the patch uses substring() is truncate application_name string in the test query's condition to less than NAMEDATALEN.

Good idea. But the application_name is actually truncated to 63
characters (NAMEDATALEN - 1)? If so, we need to do substring(... for
63) instead.

Regards,

--
Masahiko Sawada
EDB:  https://www.enterprisedb.com/