On 03/21/2017 07:42 AM, Tom Lane wrote:
Frazer McLean <frazer@xxxxxxxxxxxxxxxxxx> writes:
I came across an unexpected comparison (tested on PostgreSQL 9.4 and
9.6) for intervals with a large difference in magnitude.
'1 year'::interval > '32618665 years'::interval;
Is this a bug?
It looks like the problem is overflow of the result of interval_cmp_value,
because it's trying to compute
=# select '32618665'::int8 * 30 * 86400 * 1000000;
ERROR: bigint out of range
It's not immediately obvious how to avoid that while preserving the same
comparison semantics :-(
Not sure if it helps but this works:
test=# select extract(epoch from '1 year'::interval) > extract(epoch
from '32618665 years'::interval);
?column?
----------
f
regards, tom lane
--
Adrian Klaver
adrian.klaver@xxxxxxxxxxx
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