All, I have a question about what the expected results are of a query with multiple aggregates when there are no matching solutions, specifically if one of them is COUNT.
Take the following query for example: PREFIX books: <http://example.org/book/> PREFIX dc: <http://purl.org/dc/elements/1.1/> select (count(?b) as ?bookCount) (min(?title) as ?firstBook) where { ?b dc:title ?title } If you run it against the books database on sparql.org you get: (?bookCount ?firstBook) { ("7"^^<http://www.w3.org/2001/XMLSchema#integer> "Harry Potter and the Chamber of Secrets") } However, running it against an empty triple store (or s/dc:title/dc:title2) brings back a resultset consisting of a single row with both variables unbound. Intuitively, I would expect that you should instead get back a single binding like: (?bookCount ?firstBook) { ("0"^^<http://www.w3.org/2001/XMLSchema#integer> UNDEF) } Does anyone know if this behavior expected? I'm running against Fuseki 0.2.2. -Stephen
