I have written a prototype for "registered function" support in WFS 
filter queries, in which functions not implemented in GeoServer are 
passed to the database for execution. This allows complex or expensive 
domain-specific queries to be performed on the database server side.

Please comment if you think that this could be expanded or modified to 
help you.

See:
http://jira.codehaus.org/browse/GEOT-1929

Notes:
- Only PostGIS is supported at the moment.
- Only the community-schemas build has it
- There is no register of functions, so all are permitted (SECURITY!) 
(See GEOT-1930.)

More and better support when this is merged onto trunk and into core.

Credits go to Rob Atkinson for the concept, name, and advocating this 
approach to users for about a year.  :-)

-- 
Ben Caradoc-Davies <[EMAIL PROTECTED]>
Software Engineer, CSIRO Exploration and Mining
Australian Resources Research Centre
26 Dick Perry Ave, Kensington WA 6151, Australia

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