/// <summary>
/// Processes a Group By
/// </summary>
/// <param name="groupBy">Group By</param>
/// <param name="context">SPARQL Evaluation Context</param>
public virtual BaseMultiset ProcessGroupBy(GroupBy groupBy, SparqlEvaluationContext context)
{
if (context == null)
{
context = this.GetContext();
}
return(groupBy.Evaluate(context));
}