[Wikidata-bugs] [Maniphest] [Created] T170915: Combinations of BIND and group graph patterns result in empty variables

Tue, 18 Jul 2017 03:19:54 -0700

Lucas_Werkmeister_WMDE created this task.
Lucas_Werkmeister_WMDE added a project: Wikidata-Query-Service.
Herald added a subscriber: Aklapper.
Herald added projects: Wikidata, Discovery.

TASK DESCRIPTION

Two fairly similar issues, both probably bugs:

SELECT ?item WHERE {
  ?_item a schema:Dataset.
  { BIND( ?_item as ?item ) }
  UNION {}
}


This query (link) yields two empty results, instead of one empty one and one with ?item bound to wikibase:Dump. If the UNION is removed, it correctly yields one nonempty result.






SELECT ?item WHERE {
  BIND(wikibase:Dump AS ?_item)
  { BIND( ?_item as ?item ) }
}



This query (link) yields one empty result, instead of one with ?item bound to wikibase:Dump. If the {} are removed, it correctly yields a nonempty result.






First discovered by @Yair_rand, relayed by @Nikki.

TASK DETAIL
https://phabricator.wikimedia.org/T170915

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To: Lucas_Werkmeister_WMDE
Cc: Smalyshev, Lucas_Werkmeister_WMDE, Yair_rand, Nikki, Aklapper, GoranSMilovanovic, QZanden, EBjune, merbst, Avner, debt, Gehel, Jonas, FloNight, Xmlizer, Izno, jkroll, Wikidata-bugs, Jdouglas, aude, Tobias1984, Manybubbles, Mbch331
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