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[geomesa-users] Geotools Join queries 
I have a feeling this is not supported but I would ask.

I have two featuretypes, with a common foreign_key between them.
I want to join on that foreign_key and retrieve columns/properties from
both featuretypes.
I found an example of this in the geotools documentation, but I can't get it to work. 
I simply can't find the name of the join column to retrieve.

Below is my code:
String propertynames[] = { "\"GDELTArtifactRecordset.SourceFileName\"","\"GDELTArtifactRecordset.GlobalEventID\"","b.EventCode\""}; 
        FilterFactory2 ff = CommonFactoryFinder.getFilterFactory2();
Filter jfilter = ff.equals(ff.property("GDELTArtifactREcordset.GlobalEventID"), ff.property("b.GlobalEventID")); 
        Query query = new Query("GDELTArtifactRecordset");
        query.setPropertyNames(propertynames);

        Join join = new Join("EventRecordset", jfilter);
        join.setAlias("b");
        query.getJoins().add(join);
query.setFilter(ff.greaterOrEqual(ff.property("GDELTArtifactRecordset.GlobalEventID"), ff.literal(545650000))); 
        query.setStartIndex(0);
        CachedRowSet rowset = searchPersistor.search(query).getResults();
I have tried numerous various of the returned join column, but it will no accept any column not in my GDELTArtifactRecordset. 


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David W. Boyd
VP,  Data Solutions
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