Re: 002_types.pl fails on some timezones on windows

Hi,

On 2021-09-30 16:03:15 -0400, Tom Lane wrote:
> I wrote:
> > ... sure enough, 002_types.pl
> > falls over with TZ=Africa/Casablanca on my Linux machine, too.
> 
> Independently of whether Africa/Casablanca is a sane translation of
> that Windows zone name, it'd be nice if 002_types.pl weren't so
> sensitive to the prevailing zone.  I looked into exactly why it's
> falling over, and the answer seems to be this bit:

>         (2, tstzrange('Mon Aug 04 00:00:00 2014 CEST'::timestamptz - interval '2 days', 'Mon Aug 04 00:00:00 2014
CEST'::timestamptz),'{"[2,3]", "[20,30]"}'),
 
>         (3, tstzrange('Mon Aug 04 00:00:00 2014 CEST'::timestamptz - interval '3 days', 'Mon Aug 04 00:00:00 2014
CEST'::timestamptz),'{"[3,4]"}'),
 
>         (4, tstzrange('Mon Aug 04 00:00:00 2014 CEST'::timestamptz - interval '4 days', 'Mon Aug 04 00:00:00 2014
CEST'::timestamptz),'{"[4,5]", NULL, "[40,50]"}'),
 
> 
> The problem with this is the blithe assumption that "minus N days"
> is an immutable computation.  It ain't.  As bad luck would have it,
> these intervals all manage to cross a Moroccan DST boundary
> (Ramadan, I assume):

For a minute I was confused, because of course we should still get the same
result on the subscriber as on the publisher. But then I re-re-re-realized
that the comparison data is a constant in the test script...


> What I'm inclined to do about that is get rid of the totally-irrelevant-
> to-this-test interval subtractions, and just write the desired timestamps
> as constants.

Sounds like a plan.

Greetings,

Andres Freund