Hi all,
I've been investigating an issue a customer of ours is experiencing with
the brand-new MongoDB community plugin (many thanks to Boundless :-)).
I'm using MongoDB version 3.0.3 and GeoServer/Geotools master. I've
created a MongoDB datastore and loaded the test data from Mongo's
2dsphere index tutorial:
http://docs.mongodb.org/manual/tutorial/build-a-2dsphere-index/
Basically, the points are displayed nicely in GeoServer's layer preview
page, but as soon as I add a CQL filter as simple as "name like ‘Central
%’", the features disappear (there should be one matching the filter).
I looked at the code and I think the problem is in method
toCursor(Query, List<Filter>) of MongoFeatureSource class. This method
builds the actual query that is sent to the database and returns a
DBCursor object to the caller. In doing so, it puts in a map the names
of all the attributes that should be returned by the query (the
equivalent of SELECT clause in SQL), but wrongly considers only the
attributes returned by Query.getPropertyNames(), ignoring the filters.
As a result, if a filter operates on a property that was not listed in
the query, it will inevitably fail, because that property will be
missing in the records returned by the cursor.
To fix the issue, I think it would be sufficient to include all the
properties mentioned in a filter in the list of the attributes returned
by the query.
Code for the fix is here:
https://github.com/geotools/geotools/compare/master...ridethepenguin:mongodb-cqlfilter-issue
Any thoughts?
--
Best regards,
Stefano Costa
==
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Dott. Stefano Costa
Senior Software Engineer
GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 1660272
http://www.geo-solutions.it
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