Re: funcs.sgml - wrong example

At Wed, 18 May 2022 11:11:02 +0900 (JST), Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com> wrote in
> At Wed, 18 May 2022 03:08:32 +0200, Erik Rijkers <er(at)xs4all(dot)nl> wrote in
> > funcs.sgml has
> >
> > 42 <@ '{[1,7)}'::int4multirange
> >
> > and calls it true. The attached fixes that.
> >
> > Included are two more changes where actual output differs a bit from
> > what the doc examples show.

Forgot to mention, the all changes look good. The log(b,n) has 16
trailing digits at least since 9.6.

> A bit off-topic and just out of curiocity, is there a reason other
> than speed (and history?) for that we won't truncate trailing zeros in
> the output of log(b,n)?

Hmm. A bit wrong. I meant that, if we can allow some additional cycles
and we don't stick to the past behavior of the function, we could have
a nicer result.

> Since we have get_min_scale since 13, for example, with the following
> tweak, we get 6.0 for log(2.0, 64.0), which looks nicer.
>
>
> @@ -10300,6 +10300,8 @@ log_var(const NumericVar *base, const NumericVar *num, NumericVar *result)
> /* Divide and round to the required scale */
> div_var_fast(&ln_num, &ln_base, result, rscale, true);
>
> + result->dscale = Max(get_min_scale(result), base->dscale);
> + result->dscale = Max(result->dscale, num->dscale);
> free_var(&ln_num);

--
Kyotaro Horiguchi
NTT Open Source Software Center