[Wikidata-bugs] [Maniphest] [Created] T153353: Blazegraph not properly using labels from sub-queries for filtering (omitting rows), unless they're selected

[hoo]

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

TASK DESCRIPTION

Minimal test case:

# No results unless ?langLabel is also selected
SELECT ?lang #?langLabel
WHERE {
	{
		SELECT ?lang ?langLabel WHERE {
			BIND(wd:Q154755 AS ?lang)
			SERVICE wikibase:label { bd:serviceParam wikibase:language "en" . }
		}
	}
	FILTER("Ada"@en = ?langLabel) .
}

TASK DETAIL

https://phabricator.wikimedia.org/T153353

EMAIL PREFERENCES

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To: hoo
Cc: Aklapper, Smalyshev, hoo, EBjune, mschwarzer, Avner, debt, Gehel, D3r1ck01, Jonas, FloNight, Xmlizer, Izno, jkroll, Wikidata-bugs, Jdouglas, aude, Deskana, Manybubbles, Mbch331

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