[postgis-devel] Does ST_Max_Distance work on anyone's install

[Paul Ramsey]

I'm pretty sure it existed and worked at one point, because Dave wrote
it originally for a particular data processing use case Refractions
had. Why strk turned it off is for him to say :)

P.

On Wed, Oct 29, 2008 at 4:17 AM, Mark Cave-Ayland
<mark.cave-ayland at siriusit.co.uk> wrote:
> Obe, Regina wrote:
>>
>> http://postgis.refractions.net/documentation/manual-svn/ST_Max_Distance.
>> html
>>
>> I noticed Robert Burgholzer tried to use it and couldn't either
>> evidentally.  Though I thought it worked once upon a time.
>
> Strange. There is actually code in the function to "do things"TM but the
> elog() at the top of the function causes it to exit straightaway!
>
> Looking at svn log you can see the following comments:
>
> ------------------------------------------------------------------------
> r756 | strk | 2004-08-26 17:55:09 +0100 (Thu, 26 Aug 2004) | 2 lines
>
> max_distance() raises an 'unimplemented yet' error.
>
> ------------------------------------------------------------------------
>
> ...
>
> ------------------------------------------------------------------------
> r753 | strk | 2004-08-26 16:02:59 +0100 (Thu, 26 Aug 2004) | 2 lines
>
> Added (bogus) max_distance(geom,geom)
>
> ------------------------------------------------------------------------
>
>
> And the relevant commit diff is:
>
> pg83 at zeno:~/src/postgis-svn/trunk/lwgeom$ svn diff -r 755:756
> lwgeom_functions_basic.c
> Index: lwgeom_functions_basic.c
> ===================================================================
> --- lwgeom_functions_basic.c    (revision 755)
> +++ lwgeom_functions_basic.c    (revision 756)
> @@ -1735,6 +1735,9 @@
>        double maxdist = 0;
>        int i;
>
> +       elog(ERROR, "This function is unimplemented yet");
> +       PG_RETURN_NULL();
> +
>        geom1 = (LWGEOM *)PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
>        line1 = lwline_deserialize(SERIALIZED_FORM(geom1));
>        if ( line1 == NULL ) PG_RETURN_NULL(); // not a linestring
>
>
> I'd say from this that strk had a go at implementing this function but
> realised it didn't work properly and so disabled it soon afterwards :(
>
>
> HTH,
>
> Mark.
>
> --
> Mark Cave-Ayland
> Sirius Corporation - The Open Source Experts
> http://www.siriusit.co.uk
> T: +44 870 608 0063
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