Re: [Bigdata-developers] problem with UNION?

[Martynas J. <mar...@gr...>]

Probably unrelated, but this looks like an odd pattern since
foaf:Person is a class and not a property:

  ?s <http://xmlns.com/foaf/0.1/Person> ?l

On Tue, Aug 25, 2015 at 1:46 AM, Mike Personick <mi...@sy...> wrote:
> What is this triple pattern for?
>
> ?s ?someprop ?l .
>
> Why not just formulate as:
>
> SELECT ?s ?l WHERE {
>   {
>     ?s <http://www.w3.org/2000/01/rdf-schema#label> ?l
>   } UNION {
>     ?s <http://xmlns.com/foaf/0.1/name> ?l
>   } UNION {
>     ?s <http://xmlns.com/foaf/0.1/Person> ?l
>   }
>   FILTER regex(?l, 'kill', 'i').
> }
> LIMIT 20
>
> On Mon, Aug 24, 2015 at 2:47 PM, Joakim Soderberg
> <joa...@bl...> wrote:
>>
>>
>> If I execute the following SPARQL query:
>>
>> SELECT ?s ?l WHERE {  ?s ?someprop ?l .  {  ?s
>> <http://www.w3.org/2000/01/rdf-schema#label> ?l  }   . FILTER
>> regex(?l,'kill', 'i'). } LIMIT 20
>> I retreive the following expected result:
>>
>> Binding http://data.linkedmdb.org/resource/film/4115
>> "Dressed to Kill”
>>
>> Binding http://data.linkedmdb.org/resource/film/77289
>> "Killing Pablo"
>>
>> Binding http://data.linkedmdb.org/resource/film/928
>> "The Killer”
>>
>> etc...
>>
>>  But if I combine with UNION
>>
>> SELECT ?s ?l WHERE {  ?s ?someprop ?l .  {  ?s
>> <http://www.w3.org/2000/01/rdf-schema#label> ?l  } UNION { ?s
>> <http://xmlns.com/foaf/0.1/name> ?l } UNION { ?s
>> <http://xmlns.com/foaf/0.1/Person> ?l } . FILTER regex(?l, 'kill', 'i'). }
>> LIMIT 20
>>
>> I get the unexpected result:
>>
>> Bindin
>> ghttp://musicbrainz.org/artist/00d992b5-d6d1-4130-971b-ab571593f94a#_
>> Binding"'Sloppy' Henry"
>>
>> Binding
>> http://musicbrainz.org/artist/025a2a2e-39f8-4bea-a175-2efbfb6016ec#_
>> "#/Tau"
>>
>> Binding
>> http://musicbrainz.org/artist/02bec9dc-18f4-46af-b18a-a156b8a0583c#_
>> "'Ale'a"
>>
>> Binding
>> http://musicbrainz.org/artist/03bef19b-535e-4b8a-a882-01fcb7324386#_
>> [Alexandros]"
>>
>> Binding
>> http://musicbrainz.org/artist/0bb8cd19-f05e-44c4-8955-4cc810de33d3#_
>> "-Scaldis-"
>>
>>
>>
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