Maxlath created this task.
Maxlath added a project: Wikidata-Query-Service.
Restricted Application added a subscriber: Aklapper.
Restricted Application added a project: Wikidata.

TASK DESCRIPTION
  I found a cursed query:
  
  My initial query finding 129112 results (where only 1 row was expected):
  
https://query.wikidata.org/#SELECT%20(COUNT(?item)%20AS%20?count)%20?type%20WHERE%20{VALUES%20(?item)%20{%20(wd:Q1018063)%20(wd:Q1026869)%20}%20.?item%20wdt:P31%20?type%20.}GROUP%20BY%20?type
  
  The simplified demonstration of the problem suggested by 
@Lucas_Werkmeister_WMDE : 
  
https://query.wikidata.org/#SELECT%20%3Ftype%20%28COUNT%28%2a%29%20AS%20%3Fcount%29%20WHERE%20%7B%0A%20%20VALUES%20%3Fitem%20%7B%20%3Ca%3E%20%3Cb%3E%20%7D%0A%20%20%3Fitem%20wdt%3AP1622%20%3Ftype.%0A%7D%0AGROUP%20BY%20%3Ftype

TASK DETAIL
  https://phabricator.wikimedia.org/T237580

EMAIL PREFERENCES
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To: Maxlath
Cc: Aklapper, Maxlath, Lucas_Werkmeister_WMDE, darthmon_wmde, DannyS712, 
Nandana, Lahi, Gq86, GoranSMilovanovic, QZanden, EBjune, merbst, LawExplorer, 
_jensen, rosalieper, Scott_WUaS, Jonas, Xmlizer, jkroll, Smalyshev, 
Wikidata-bugs, Jdouglas, aude, Tobias1984, Manybubbles, Mbch331
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