RDF Facet Objects Ranges Queries

[agazzarini]

Some pointers:

http://iswc2006.semanticweb.org/items/Oren2006nx.pdf
http://www.cs.ox.ac.uk/files/6686/main.pdf
http://www.w3.org/2001/sw/wiki/Facet

[agazzarini]

Facet fields have been implemented but while developing things for issue #34 I met some mistakes

[agazzarini]

Facet fields have been correctly implemented with fixes committed for issue #34.
Next Step: facet queries

[agazzarini]

Facet queries work only with Solr default query parser. Instead, using {!sparql} always results in 0 counts.

[agazzarini]

A first draft of facet range queries has been pushed out. It is still in r_rdf_faceting branch because it is not completed. However, strictly "facet ranges" are not supported: instead, we have "facet range queries", where one can facet by using a query (evaluated by a default solr query parser) that selects literals (numerics and dates) and applies facet ranges on top of them. More info on Wiki soon

[agazzarini]

The functionality has been implemented but not yet commited.

Being able to support aliased and non-aliased facet range queries, i had to introduced a query syntax with parameters for allowing a user to do thjngs like this

facet.range.q.1=p:<#xyz>
&facet.range.q.alias.1=xyz
&facet.range.q.2=+p:<#abc> -s:<yyy>
&facet.range.q.alias.2=foo

[agazzarini]

A stable version of this feature has been implemented and merged in master. Missing points are

• local params
• integration tests
• better coverage of unit tests