ilmari@ilmari.org (Dagfinn Ilmari Mannsåker) writes:
> The behaviour seems to have changed in 9.6:
Indeed, https://www.postgresql.org/docs/current/static/release-9-6.html
has the following entry:
* Improve the accuracy of the ln(), log(), exp(), and pow() functions
for type numeric (Dean Rasheed)
> $ psql -p5495
> Line style is unicode.
> Border style is 2.
> psql (10.1, server 9.5.10)
> Type "help" for help.
>
> ilmari@[local]:5495 ~=# select 0.12 ^ (-25);
> ERROR: division by zero
> ilmari@[local]:5495 ~=# \q
>
> $ psql -p5496
> Line style is unicode.
> Border style is 2.
> psql (10.1, server 9.6.6)
> Type "help" for help.
>
> ilmari@[local]:5496 ~=# select 0.12 ^ (-25);
> ┌───────────────────────────────────────────┐
> │ ?column? │
> ├───────────────────────────────────────────┤
> │ 104825960103961013959336.4983657883169110 │
> └───────────────────────────────────────────┘
> (1 row)
>
> ilmari@[local]:5496 ~=# \q
>
> - ilmari
--
"A disappointingly low fraction of the human race is,
at any given time, on fire." - Stig Sandbeck Mathisen