Problem in

Hi everyone!

I found an incomprehensible behavior of some functions in PostgreSQL 9.5.12 (for 10.6 working good).

For example:

SELECT acos(
cos(radians(48.9193))
* cos(radians(48.9193))
* cos(radians(2.5431) - radians(2.5431))
+ sin(radians(48.9193))
* sin(radians(48.9193))
) as result;

This returned [22003] ERROR: input is out of range

But this one working good:

SELECT acos(
cos(radians(48.9192))
* cos(radians(48.9192))
* cos(radians(2.5431) - radians(2.5431))
+ sin(radians(48.9192))
* sin(radians(48.9192))
) as result;

The difference is 48.9193 => 48.9192

I did research a bit and found what this query

SELECT cos(0.8538028527708621) * cos(0.8538028527708621) + sin(0.8538028527708621) * sin(0.8538028527708621) as s1;
Returned 1.0000000000000002

SELECT cos(0.8538028527708621) * cos(0.8538028527708621) as s1; -- 0.43180849723816966
SELECT sin(0.8538028527708621) * sin(0.8538028527708621) as s1; -- 0.5681915027618305
Looks like cos() have scale = 17 (sometimes), but sin() have scale 16

P.S. I saw it only in the IntelliJ IDEA console. In the native console these values will be rounded:

SELECT cos(0.8538028527708621) * cos(0.8538028527708621) as s1;
s1
------------------
0.43180849723817

* * *
Best Regards,
Max Lipsky