On 06 Sep 2013, at 17:58, Dominique Devienne <ddevie...@gmail.com> wrote:

>> select Distance( constGeom, geometry ) from table, (select
>> GeomFromText('Point(13.457 3)') as constGeom );
> 
> Clever. Thanks for that.

Simple and elegant. Thanks for the idea, I'll give it a try.

> Or make your Distance function implementation do the GeomFromText
> implicitly, with a bit of duck-typing.

The semantics of Distance (or better ST_Distance) are defined in the ISO SQL/MM 
part 3 and OGC Simple Feature/SQL specs. I would prefer to avoid non-specified 
behaviour. 

Pepijn

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