Hello Sergejs, Yes this is a clean bug in current SPARQL SELECT DISTINCT implementation. I've reproduced it almost identically using a trivial script, now I'm trying to fix it.
Best Regards, Ivan Mikhailov http://virtuoso.openlinksw.com On Tue, 2008-11-18 at 17:38 +0200, Sergejs Rikacovs wrote: > Dear Sir/Madam, > > Noticed one strange thing while executing SPARQL queries on Virtuoso > through Virtuoso Sparql Query Form. > > I have two queries( the only difference between them is absence of the > order by clause in the second query ) : > > select distinct ?assocUri {?assocUri > <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> > <http://www.w3.org/2002/07/owl#ObjectProperty>. } ORDER BY ?assocUri > > This query returns following data: > > <?xml version="1.0" ?> > <sparql xmlns="http://www.w3.org/2005/sparql-results#"; > xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; > xsi:schemaLocation="http://www.w3.org/2001/sw/DataAccess/rf1/result2.xsd";> > <head> > <variable name="assocUri"/> > </head> > <results distinct="false" ordered="true"> > <result> > <binding > name="assocUri"><uri>http://www.owl-ontologies.com/Ontology1220554345.owl#exemplarAliquot</uri></binding> > </result> > <result> > <binding > name="assocUri"><literal>http://www.owl-ontologies.com/Ontology1220554345.owl#persChild</literal></binding> > </result> > <result> > <binding > name="assocUri"><literal>http://www.owl-ontologies.com/Ontology1220554345.owl#persDZTwin</literal></binding> > </result> > <result> > <binding > name="assocUri"><literal>http://www.owl-ontologies.com/Ontology1220554345.owl#persKinsman</literal></binding> > </result> > <result> > <binding > name="assocUri"><literal>http://www.owl-ontologies.com/Ontology1220554345.owl#persMZTwin</literal></binding> > </result> > <result> > <binding > name="assocUri"><literal>http://www.owl-ontologies.com/Ontology1220554345.owl#persParent</literal></binding> > </result> > <result> > <binding > name="assocUri"><literal>http://www.owl-ontologies.com/Ontology1220554345.owl#persSample</literal></binding> > </result> > <result> > <binding > name="assocUri"><literal>http://www.owl-ontologies.com/Ontology1220554345.owl#persSibling</literal></binding> > </result> > <result> > <binding > name="assocUri"><literal>http://www.owl-ontologies.com/Ontology1220554345.owl#pers_ZTwin</literal></binding> > </result> > </results> > </sparql> > > > The second query: > > select distinct ?assocUri {?assocUri > <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> > <http://www.w3.org/2002/07/owl#ObjectProperty>. } > > This query returns : > > > <?xml version="1.0" ?> > <sparql xmlns="http://www.w3.org/2005/sparql-results#"; > xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; > xsi:schemaLocation="http://www.w3.org/2001/sw/DataAccess/rf1/result2.xsd";> > <head> > <variable name="assocUri"/> > </head> > <results distinct="false" ordered="true"> > <result> > <binding > name="assocUri"><uri>http://www.owl-ontologies.com/Ontology1220554345.owl#persDZTwin</uri></binding> > </result> > <result> > <binding > name="assocUri"><uri>http://www.owl-ontologies.com/Ontology1220554345.owl#persKinsman</uri></binding> > </result> > <result> > <binding > name="assocUri"><uri>http://www.owl-ontologies.com/Ontology1220554345.owl#persMZTwin</uri></binding> > </result> > <result> > <binding > name="assocUri"><uri>http://www.owl-ontologies.com/Ontology1220554345.owl#pers_ZTwin</uri></binding> > </result> > <result> > <binding > name="assocUri"><uri>http://www.owl-ontologies.com/Ontology1220554345.owl#persSample</uri></binding> > </result> > <result> > <binding > name="assocUri"><uri>http://www.owl-ontologies.com/Ontology1220554345.owl#persSibling</uri></binding> > </result> > <result> > <binding > name="assocUri"><uri>http://www.owl-ontologies.com/Ontology1220554345.owl#persChild</uri></binding> > </result> > <result> > <binding > name="assocUri"><uri>http://www.owl-ontologies.com/Ontology1220554345.owl#persParent</uri></binding> > </result> > <result> > <binding > name="assocUri"><uri>http://www.owl-ontologies.com/Ontology1220554345.owl#exemplarAliquot</uri></binding> > </result> > </results> > </sparql> > > > So If I have the order by clause in my query I get literals instead of > URI`s, and If I do not have order by clause I recieve URIs, as I would > expect. > > Could I ask you to give some comments on this ? > > Best regards, > S. Rikacovs. > ------------------------------------------------------------------------- > This SF.Net email is sponsored by the Moblin Your Move Developer's challenge > Build the coolest Linux based applications with Moblin SDK & win great prizes > Grand prize is a trip for two to an Open Source event anywhere in the world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > _______________________________________________ Virtuoso-users mailing list > Virtuoso-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/virtuoso-users
