[Wikidata-bugs] [Maniphest] T279945: Using the same property in different conditions with regardless of value generates malformed SPARQL query

[guergana.tzatchkova]

guergana.tzatchkova created this task.
guergana.tzatchkova added a project: Wikidata Query Builder.
Restricted Application added a subscriber: Aklapper.
Restricted Application added a project: Wikidata.

TASK DESCRIPTION
  **List of steps to reproduce** (step by step, including full links if 
applicable):
  
  - select property P18 <https://phabricator.wikimedia.org/P18> (image) it is 
automatically regardless of value)
  - create a different property and unite with OR or AND again with P18 
<https://phabricator.wikimedia.org/P18>
  - click "Run Query" button
  
  Example in QB <https://w-beta.wmflabs.org/Hj>
  
  **Actual Results (what happens?)**:
  
  Error: `Query is malformed: BNodeID already used in another scope: 
anyValueP18` because
  
  `anyValueP18` should have an index. should be `anyValueP18_0` and 
`anyValueP18_1`:
  
    SELECT DISTINCT ?item WHERE {
          {
            ?item p:P281 ?statement0.
            ?statement0 (ps:P281) "6200".
          }
          UNION
          {
            ?item p:P18 ?statement1.
            ?statement1 (ps:P18) _:anyValueP18.
          }
          {
            ?item p:P30 ?statement2.
            ?statement2 (ps:P30/(wdt:P279*)) wd:Q46.
          }
          UNION
          {
            ?item p:P18 ?statement3.
            ?statement3 (ps:P18) _:anyValueP18.
          }
        }
        LIMIT 100
  
  **Expected Results (what should have happened?)**:
  
  The following SPARQL should have been generated
  
    SELECT DISTINCT ?item WHERE {
          {
            ?item p:P281 ?statement0.
            ?statement0 (ps:P281) "6200".
          }
          UNION
          {
            ?item p:P18 ?statement1.
            ?statement1 (ps:P18) _:anyValueP18_0.
          }
          {
            ?item p:P30 ?statement2.
            ?statement2 (ps:P30/(wdt:P279*)) wd:Q46.
          }
          UNION
          {
            ?item p:P18 ?statement3.
            ?statement3 (ps:P18) _:anyValueP18_1.
          }
        }
        LIMIT 100

TASK DETAIL
  https://phabricator.wikimedia.org/T279945

WORKBOARD
  https://phabricator.wikimedia.org/project/board/4990/

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

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

_______________________________________________
Wikidata-bugs mailing list
Wikidata-bugs@lists.wikimedia.org
https://lists.wikimedia.org/mailman/listinfo/wikidata-bugs