[Wikidata-bugs] [Maniphest] [Created] T168741: SELECT * on query with no variables and property path results in NotMaterializedException

[WikidataFacts]

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

TASK DESCRIPTION

Example 1:

SELECT * WHERE {
  wd:Q4176 wdt:P31/wdt:P279 wd:Q16970.
}

Example 2, more stable against changes on Wikidata:

SELECT * WHERE {
  wikibase:Dump a/^a wikibase:Dump.
}

…

 Caused by: org.openrdf.query.QueryEvaluationException: com.bigdata.rdf.internal.NotMaterializedException: TermId(248U)

	at com.bigdata.rdf.sail.Bigdata2Sesame2BindingSetIterator.hasNext(Bigdata2Sesame2BindingSetIterator.java:188)
	at info.aduna.iteration.IterationWrapper.hasNext(IterationWrapper.java:68)
	at org.openrdf.query.QueryResults.report(QueryResults.java:155)
	at org.openrdf.repository.sail.SailTupleQuery.evaluate(SailTupleQuery.java:76)
	at com.bigdata.rdf.sail.webapp.BigdataRDFContext$TupleQueryTask.doQuery(BigdataRDFContext.java:1713)
	at com.bigdata.rdf.sail.webapp.BigdataRDFContext$AbstractQueryTask.innerCall(BigdataRDFContext.java:1569)
	at com.bigdata.rdf.sail.webapp.BigdataRDFContext$AbstractQueryTask.call(BigdataRDFContext.java:1534)
	at com.bigdata.rdf.sail.webapp.BigdataRDFContext$AbstractQueryTask.call(BigdataRDFContext.java:747)
	... 4 more

Caused by: com.bigdata.rdf.internal.NotMaterializedException: TermId(248U)

	at com.bigdata.rdf.internal.impl.AbstractIV.getValue(AbstractIV.java:993)
	at com.bigdata.rdf.sail.Bigdata2Sesame2BindingSetIterator.getBindingSet(Bigdata2Sesame2BindingSetIterator.java:298)
	at com.bigdata.rdf.sail.Bigdata2Sesame2BindingSetIterator.hasNext(Bigdata2Sesame2BindingSetIterator.java:140)
	... 11 more

It works if the query has a simple predicate instead of a path:

SELECT * WHERE {
  wikibase:Dump a schema:Dataset.
}

Selecting some bogus variable explicitly also works:

SELECT ?_ WHERE {
  wikibase:Dump a/^a wikibase:Dump.
}

(Yes, I know all of these should really be ASK queries.)

TASK DETAIL

https://phabricator.wikimedia.org/T168741

EMAIL PREFERENCES

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

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

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