Smalyshev created this task.
Smalyshev assigned this task to Manybubbles.
Smalyshev added a subscriber: Smalyshev.
Smalyshev added projects: Discovery, Wikidata-Query-Service.
Herald added a subscriber: Aklapper.
Herald added a project: Wikidata.

TASK DESCRIPTION
  This code run on db01 works:
  
  ```
  prefix wikibase: <http://wikiba.se/ontology#>
  PREFIX wd: <http://www.wikidata.org/entity/> 
  PREFIX wdt: <http://www.wikidata.org/prop/direct/>
  PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
  PREFIX p: <http://www.wikidata.org/prop/>
  PREFIX v: <http://www.wikidata.org/prop/statement/>
  SELECT ?p ?w ?pLabel ?wLabel WHERE {
     wd:Q30 p:P6/v:P6 ?p .
     ?p wdt:P26 ?w .
     SERVICE wikibase:label.de.en {
       ?p rdfs:label ?pLabel .
       ?w rdfs:label ?wLabel .
     }
   }
  ```
  
  But this one produces empty labels:
  
  ```
  prefix wikibase: <http://wikiba.se/ontology#>
  PREFIX wd: <http://www.wikidata.org/entity/> 
  PREFIX wdt: <http://www.wikidata.org/prop/direct/>
  PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
  PREFIX p: <http://www.wikidata.org/prop/>
  PREFIX v: <http://www.wikidata.org/prop/statement/>
  SELECT ?p ?w ?pLabel ?wLabel WHERE {
     wd:Q30 p:P6/v:P6 ?p .
     ?p wdt:P26 ?w .
     SERVICE wikibase:label.de.en { }
   }
  ```
  
  Something seems to be wrong with handling empty service.

TASK DETAIL
  https://phabricator.wikimedia.org/T104657

EMAIL PREFERENCES
  https://phabricator.wikimedia.org/settings/panel/emailpreferences/

To: Manybubbles, Smalyshev
Cc: Aklapper, Smalyshev, jkroll, Wikidata-bugs, Jdouglas, aude, Manybubbles, 
JanZerebecki, Malyacko, P.Copp



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