Filtering on empty list kills qlever #2701
Description
QLever server, compiled on Wed Jan 21 18:47:07 UTC 2026 using git hash 27eef3
Query:
SELECT * WHERE {
?s ?p ?o .
FILTER (?s IN ())
}
Expected results:
Empty results
Actual results:
Qlever server is instantly killed without any indications of what has happened. Qlever's wikidata throws 502 when trying to execute query.
Logs do not show anything about application getting killed. Last logs before server dies:
2026-02-06 11:41:54.413 - INFO: Request received via POST, content type "application/sparql-query"
2026-02-06 11:41:54.415 - INFO: Processing the following SPARQL query:
SELECT * WHERE {
?s ?p ?o .
FILTER (?s IN ())
}
2026-02-06 11:41:54.415 - INFO: Requested media types of the result are: "application/sparql-results+json"