Re: Issue with pg_stat_subscription_stats

On Thu, Jul 7, 2022 at 12:53 AM Andres Freund <andres(at)anarazel(dot)de> wrote:
>
> Hi,
>
> On 2022-07-06 11:41:46 +0900, Masahiko Sawada wrote:
> > diff --git a/src/test/regress/sql/subscription.sql b/src/test/regress/sql/subscription.sql
> > index 74c38ead5d..6a46956f6e 100644
> > --- a/src/test/regress/sql/subscription.sql
> > +++ b/src/test/regress/sql/subscription.sql
> > @@ -30,6 +30,12 @@ CREATE SUBSCRIPTION regress_testsub CONNECTION 'dbname=regress_doesnotexist' PUB
> > COMMENT ON SUBSCRIPTION regress_testsub IS 'test subscription';
> > SELECT obj_description(s.oid, 'pg_subscription') FROM pg_subscription s;
> >
> > +-- Check if the subscription stats are created and stats_reset is updated
> > +-- by pg_stat_reset_subscription_stats().
> > +SELECT subname, stats_reset IS NULL stats_reset_is_null FROM pg_stat_subscription_stats ORDER BY 1;
>
> Why use ORDER BY 1 instead of just getting the stats for the subscription we
> want to test? Seems a bit more robust to show only that one, so we don't get
> unnecessary changes if the test needs to create another subscription or such.

Right, it's more robust. I've updated the patch accordingly.

>
>
> > +SELECT pg_stat_reset_subscription_stats(oid) FROM pg_subscription;
> > +SELECT subname, stats_reset IS NULL stats_reset_is_null FROM pg_stat_subscription_stats ORDER BY 1;
> > +
>
> Perhaps worth resetting again and checking that the timestamp is bigger than
> the previous timestamp? You can do that with \gset etc.

Agreed.

Regards,

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