Re: [COMMITTERS] pgsql: Add trigonometric functions that work in degrees.

On 19 April 2016 at 14:38, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Yeah, what I was thinking of printing is something like
>
>         asind(x),
>         asind(x) IN (-90,-30,0,30,90) AS asind_exact,
>         ...
>
> with extra_float_digits=3.  The point of this is not necessarily to give
> any extra information, though it might, but for failures to be more easily
> interpretable.  If I'd forgotten how the test worked just a few months
> after committing it, how likely is it that some random user faced with a
> similar failure would understand what they were seeing?
>
> Also, though I agree that it might not help much to know whether the
> output is 45.0000000000000001 or 44.9999999999999999, our thoughts would
> be trending in quite a different direction if it turns out that the
> output is radically wrong, or even a NaN.  The existing test cannot
> exclude that possibility.
>

OK, that sounds like it would be a useful improvement to the tests.

Regards,
Dean