[dotNetRDF-bugs] Problem with aggregate

[Tomek P. <plo...@gm...>]

Hi Rob

Please try the following code:

TripleStore store = new TripleStore();
            store.LoadFromUri(UriFactory.Create("http://semanticsage.home.lc/files/LearningStyles.rdf"));

            Options.AlgebraOptimisation = false;

            var graph = (IGraph)store.ExecuteQuery(@"prefix sage:
<http://www.semanticsage.home.lc/LearningStyles.owl#>
prefix xsd: <http://www.w3.org/2001/XMLSchema#>
prefix : <http://semanticsage.home.lc/files/LearningStyles.rdf#>

CONSTRUCT
{
    ?MTech :max ?maxScore
}
WHERE
{
    SELECT ?MTech max(?max) as ?maxScore
    WHERE
    {
        SELECT ?MTech ?LessonType sum(?hasValue) as ?max
        WHERE
        {
            ?MTech sage:attendsLessons ?Lesson.
            ?Lesson sage:hasLessonType ?LessonType.
            ?MTech sage:undergoesEvaluation ?Quiz.
            ?Quiz sage:isForLesson ?Lesson.
            ?MTech sage:hasQuizMarks ?QuizMarks.
            ?QuizMarks sage:belongsToQuiz ?Quiz.
            ?QuizMarks sage:hasValue ?hasValue.
            ?Lesson sage:inRound '1'^^xsd:int.
        }
        GROUP BY ?MTech ?LessonType
    }
    GROUP BY ?MTech
}");

The above query works fine in Leviathan demo.

However on my box instead of actual values I get all ?maxScore bound
to "0"@xsd:int. I'm running this using the latest dll from trunk,

Thanks,
Tom