BUG #2767: Bug in avg(interval)
The following bug has been logged online:
Bug reference: 2767
Logged by: Steffen Macke
Email address: sdteffen@gmail.com
PostgreSQL version: 8.1.4
Operating system: Windows XP
Description: Bug in avg(interval)
Details:
select avg(interval) is occasionally returning wrong
values:
Example:
select avg(test) from problem
returns
1 day 25:15:30
while the correct result is
2 days 01:15:30
Here is a table with sample data used:
CREATE TABLE problem (
test interval
);
COPY problem (test) FROM stdin;
1 day 20:39:28
4 days 00:02:53
1 day 00:03:01
2 days 02:08:34
01:33:34
3 days 07:05:35
\.
"Steffen Macke" <sdteffen@gmail.com> writes:
select avg(test) from problem
returns
1 day 25:15:30
while the correct result is
2 days 01:15:30
This is not a bug; it's the result you're supposed to get.
But see justify_hours() if you want to fold up 24 hours to 1 day.
regards, tom lane