A collection of bugs found in the Rasqal SPARQL query engine, part of librdf.

rasqal-bugs.md

Rasqal bugs

The librdf issue tracker does not appear to allow bug submissions from the public, so I'm collecting some here.

VALUES one-variable form returns only first value

$ roqet -e 'SELECT * { VALUES ?i { 1 2 3 } }'

Expected:

?i
1
2
3

Actual:

roqet: Running query 'SELECT * { VALUES ?i { 1 2 3 } }'
roqet: Query has a variable bindings result
row: [i=string("1"^^<http://www.w3.org/2001/XMLSchema#integer>)]
roqet: Query returned 1 results

The problem is specific to the special one-variable syntax of VALUES. Rewritten like this it works fine:

VALUES (?i) { (1) (2) (3) }

VALUES zero-variable form segfaults

$ roqet -e 'SELECT * { VALUES () { () () } }'

Result:

Segmentation fault: 11

Invalid string escapes are accepted

$ roqet -e 'SELECT ("\a" AS ?x) {}'

Expected: Syntax error, \a is not a valid string escape and not allowed by the grammar

Actual:

roqet: Query has a variable bindings result
row: [x=string("a")]
roqet: Query returned 1 results