Re: numeric regression test passes, but why?

ilmari(at)ilmari(dot)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(at)[local]:5495 ~=# select 0.12 ^ (-25);
> ERROR: division by zero
> ilmari(at)[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(at)[local]:5496 ~=# select 0.12 ^ (-25);
> ┌───────────────────────────────────────────┐
> │ ?column? │
> ├───────────────────────────────────────────┤
> │ 104825960103961013959336.4983657883169110 │
> └───────────────────────────────────────────┘
> (1 row)
>
> ilmari(at)[local]:5496 ~=# \q
>
> - ilmari

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