I have only been able to find examples where geometry attributes are returned
from cross layer filtering functions, but the GeoServer documentation says:
A common use case is to extract a geometry-valued attribute, and then use the
value(s) in a spatial predicate against a geometry attribute in the primary
layer.<http://docs.geoserver.org/stable/en/user/extensions/querylayer/index.html>
Which leads me to believe that it was intended to be used to return other data.
I'm looking for examples of how that might be done in a CQL filter.
________________________________
I have attempted something like this:
http://localhost:8181/geoserver/test/wms?service=WMS&version=1.1.0&request=GetMap&layers=test:layer1,test:layer2&styles=&bbox=-81.54053,41.61621,-77.33826,43.41248&width=768&height=330&srs=EPSG:4326&format=application/openlayers&cql_filter=INCLUDE;property2a=querySingle('test:layer1','property1b','property1a=123')
Where only records in layer2 that have layer2.property2a = layer1.property1b
are returned.
I get the exception: "Could not parse CQL filter list."
________________________________
Similarly:
http://localhost:8181/geoserver/test/wms?service=WMS&version=1.1.0&request=GetMap&layers=test:layer1,test:layer2&styles=&bbox=-81.54053,41.61621,-77.33826,43.41248&width=768&height=330&srs=EPSG:4326&format=application/openlayers&cql_filter=INCLUDE;property2a
IN queryCollection('test:layer1','property1b','INCLUDE')
Where the values of layer2 will only be returned if layer2.property2a has a
value in the returned values from layer1.property1b
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