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

Sat, 22 Jul 2017 02:45:54 -0700

Lucas_Werkmeister_WMDE added a comment.

Ugh, I should’ve remembered that, I’m pretty sure I ran into that problem before… thanks.

But that still leaves one case that I think is incorrect:

If the UNION is removed, it correctly yields one nonempty result.

That is:

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


This returns wikibase:Dump in ?item, but shouldn’t it result in one result with empty ?item, just like this query?



SELECT ?item WHERE {
  ?_item a schema:Dataset.
}



If the subgroup is evaluated first, then there shouldn’t be anything to bind as ?item.

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

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To: Lucas_Werkmeister_WMDE
Cc: PokestarFan, 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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