On Wed, 18 Oct 2023 at 09:16, Tomas Vondra <tomas.von...@enterprisedb.com> wrote: > > BTW when adding the tests with extreme values, I noticed this: > > test=# select '5874897-01-01'::date; > date > --------------- > 5874897-01-01 > (1 row) > > test=# select '5874897-01-01'::date + '1 second'::interval; > ERROR: date out of range for timestamp >
That's correct because date + interval returns timestamp, and the value is out of range for a timestamp. This is equivalent to: select '5874897-01-01'::date::timestamp + '1 second'::interval; ERROR: date out of range for timestamp and I think it's good that it gives a different error from this: select '294276-01-01'::date::timestamp + '1 year'::interval; ERROR: timestamp out of range so you can tell that the overflow in the first case happens before the addition. Of course a side effect of internally casting first is that you can't do things like this: select '5874897-01-01'::date - '5872897 years'::interval; ERROR: date out of range for timestamp which arguably ought to return '2000-01-01 00:00:00'. In practice though, I think it would be far more trouble than it's worth trying to change that. Regards, Dean
