Re: pgsql: Add support for hyperbolic functions, as well as log10().

On Wed, Mar 13, 2019 at 10:39 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Robert Haas <robertmhaas@gmail.com> writes:
> > On Wed, Mar 13, 2019 at 8:49 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
> >> Meh.  As I said before, we're not in the business of improving on what
> >> libm does --- if someone has a beef with the results, they need to take
> >> it to their platform's libm maintainer, not us.  The point of testing
> >> this at all is just to ensure that we've wired up the SQL functions
> >> to the library functions correctly.
>
> > Pretty sure we don't even need a test for that.  asinh() isn't going
> > to call creat() by mistake.
>
> No, but that's not the hazard.  I have a very fresh-in-mind example:
> at one point while tweaking Laetitia's patch, I'd accidentally changed
> datanh so that it called tanh not atanh.  The previous set of tests did
> not reveal that :-(

Well, that was a goof, but it's not likely that such a regression will
ever be reintroduced.

-- 
Robert Haas
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