On 11/23/21 02:29, Ilya Anfimov wrote: > (*We > strangely don't have an absolute value operator on interval, but > I think you've got the point*).
Although tangential to the topic, that might be because a PG interval is a triple of independently-signed months/days/seconds components. An interval like '1 month -31 days +12:00:00' is positive or negative depending on the absolute date you apply it to, so what its absolute value should be isn't clear in isolation.
Umm, it's definitely negative:
odyssey=> select '1 month -31 days +12:00:00'::interval < '0 months'::interval; ?column? ---------- t (1 row)
It's just that due to the complexities of our calendar/time systems, adding it to a timestamp can move the timestamp in either direction:
I'm working on a patch to add abs(interval) so I noticed this. There are lots of oddities, including lots of intervals which compare equal to 0 but which can change a timestamp when added to it, but as presently designed, this particular interval compares as negative.
