[Wikidata-bugs] [Maniphest] T278518: Can't use BIND and wikibase:statements in the same query

[Zuhaitz]

Zuhaitz created this task.
Zuhaitz added a project: Wikidata.
Restricted Application added a subscriber: Aklapper.

TASK DESCRIPTION
  Steps to Reproduce:
  
  I try to execute the following query on https://query.wikidata.org/ :
  
    SELECT distinct ?id ?lang ?n
    WHERE {
        {
            ?id rdfs:label|skos:altLabel "Paris"@en .
            BIND("EN" AS ?lang)
        }
        UNION
        {
            ?id rdfs:label|skos:altLabel "Paris"@eu .
            BIND("EU" AS ?lang)
        }
        ?id wikibase:statements ?n .
    }
  
  Actual Results:
  
  Query timeout
  
  Expected Results:
  
  No timeout
  
  Additional information:
  
  In the following similar cases the query executes successfuly:
  
  Removing the UNION (with the second condition):
  
    SELECT distinct ?id ?lang ?n
    WHERE {
        {
            ?id rdfs:label|skos:altLabel "Paris"@en .
            BIND("EN" AS ?lang)
        }
        ?id wikibase:statements ?n .
    }
  
  Removing the BIND statements:
  
    SELECT distinct ?id ?n
    WHERE {
        {
            ?id rdfs:label|skos:altLabel "Paris"@en .
        }
        UNION
        {
            ?id rdfs:label|skos:altLabel "Paris"@eu .
        }
        ?id wikibase:statements ?n .
    }
  
  Removing the "wikibase:statements" statement:
  
    SELECT distinct ?id ?lang ?n
    WHERE {
        {
            ?id rdfs:label|skos:altLabel "Paris"@en .
            BIND("EN" AS ?lang)
        }
        UNION
        {
            ?id rdfs:label|skos:altLabel "Paris"@eu .
            BIND("EU" AS ?lang)
        }
    }

TASK DETAIL
  https://phabricator.wikimedia.org/T278518

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

To: Zuhaitz
Cc: Zuhaitz, Aklapper, Invadibot, maantietaja, Akuckartz, Nandana, Lahi, Gq86, 
GoranSMilovanovic, QZanden, LawExplorer, _jensen, rosalieper, Scott_WUaS, 
Wikidata-bugs, aude, Mbch331

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