Cool, was just curious. Thanks for the explanation.
On Fri, Jan 28, 2011 at 9:08 AM, Andrea Aime
<[email protected]>wrote:
> On Fri, Jan 28, 2011 at 2:53 PM, Chris Holmes <[email protected]> wrote:
> > +1, sounds like a really great improvement. And I'd say that small
> > improvements that give a concrete win without becoming bogged down in the
> > end all 'right' thing are becoming 'the geoserver way', and this is a
> great
> > step towards joins.
> >
> > One question, does the (probably lame) WFS specified join stuff kick in
> at
> > all with this? Like is there overlap between what that does and what
> this
> > provides? Or does that only make sense to implement when we get 'real'
> join
> > support? No worries at all if the answer is 'we could do it with these
> > constructs, but we don't care about it', I'm just curious, like if a
> client
> > comes along and says 'I want official WFS Joins', if this could be used
> as a
> > basis for a limited version of that. Though I do remember that joins
> seemed
> > to be one of those less thought out areas of the WFS spec.
>
> Well, I don't know the joins the in wfs spec enough to provide you with a
> full
> answer.
> The joins I've seen in WFS 2.0 generate a "tuple", which is a
> construct containing
> two or more features, equivalent more or less to the following
>
> select a.p1, a.p2, b.p3, b.p4
> from a inner join b on <join condition>
>
> and the wfs result would look something like:
>
> <tuple>
> <a>
> <p1>...</p1>
> <p2>...</p2>
> </a>
> <b>
> <p3>...</p3>
> <p4>...</p4>
> </b>
> </tuple>
>
> However the case I'm after is joining only for the sake
> of filtering.
> Not sure the functions I'm going to build will work
> in that case, a generic filter might involve multiple
> conditions from two or more feature types, I did not
> think about it much but it does not look like it would
> be something easy to coax into simple single self contained
> call to a single layer (which is what the functions I'm proposing
> do).
>
> Cheers
> Andrea
>
>
> --
> Ing. Andrea Aime
> Technical Lead
>
> GeoSolutions S.A.S.
> Via Poggio alle Viti 1187
> 55054 Massarosa (LU)
> Italy
>
> phone: +39 0584962313
> fax: +39 0584962313
>
> http://www.geo-solutions.it
> http://geo-solutions.blogspot.com/
> http://www.linkedin.com/in/andreaaime
> http://twitter.com/geowolf
>
> -----------------------------------------------------
>
------------------------------------------------------------------------------
Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)!
Finally, a world-class log management solution at an even better price-free!
Download using promo code Free_Logger_4_Dev2Dev. Offer expires
February 28th, so secure your free ArcSight Logger TODAY!
http://p.sf.net/sfu/arcsight-sfd2d
_______________________________________________
Geoserver-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/geoserver-devel
