If I understand the concept, this feature will not add functionality. The purpose is to make the statement more efficient
right ? Andrea Aime writes: > Andrea Aime ha scritto: >>> For example: >>> >>> SELECT id, name, url, ST_SetSRID(ST_Point(longitude, latitude),4326) as >>> location FROM non_spatial_table; >>> >>> where longitude and latitude are numeric columns. >> >> You can, but it would not be worth using performance wise. >> For example, a bbox filter against the feature type defined >> above would be turned into the following sql query: >> >> select id, name, url, location >> from >> ( >> SELECT id, name, url, >> ST_SetSRID(ST_Point(longitude, latitude),4326) as location >> FROM non_spatial_table) >> ) >> where location && <the bbox> >> >> which would not give enough info to the db to turn that >> into a filter against longitude and latitude. > > Thinking thinking, evil thinking... > > Since we're already giving the user the control to make > her own query, what about giving her the tools to make her > own optimizations as well? > What if, for example, we allow a variable substitution mechanism > based on the simplest and more common filter, the bbox one? > We allow the user to add a special part of the definition query > that is actually expanded only if a bbox filter can be extracted > from the original gt2 query, and then the user could give the > jdbc datastore something like: > > select id, name, url, > ST_SetSRID(ST_Point(longitude, latitude),4326) as location > from non_spatial_table > {where longitude >= $bbox.minx and longitude <= $bbox.maxx > and latitude >= $bbox.miny and latitude <= $bbox.maxy} > > or something like: > > select id, st_buffer(geometry, 1500), name > from my_spatial_table > where flow > 143 > {and geometry && $bbox} > > Assuming the $bbox would be expanded into the literal representation > of a bounding box for that database (using the sql dialect). > Or, to make things a little easier for us, we pass down > $minx, $miny, $maxx, $maxy and let the user build whatever she > feels like with them. > > Too evil? > > Cheers > Andrea > > > > > -- > Andrea Aime > OpenGeo - http://opengeo.org > Expert service straight from the developers. > > ------------------------------------------------------------------------------ > Download Intel® Parallel Studio Eval > Try the new software tools for yourself. Speed compiling, find bugs > proactively, and fine-tune applications for parallel performance. > See why Intel Parallel Studio got high marks during beta. > http://p.sf.net/sfu/intel-sw-dev > _______________________________________________ > Geotools-devel mailing list > Geotools-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/geotools-devel ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Geotools-devel mailing list Geotools-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/geotools-devel