/// <summary>
/// Evaluates the aggregate expression.
/// </summary>
/// <param name="context">Evaluation Context.</param>
/// <param name="bindingID">Binding ID.</param>
/// <returns></returns>
public override IValuedNode Evaluate(SparqlEvaluationContext context, int bindingID)
{
IValuedNode aggValue;
if (context.Binder.IsGroup(bindingID))
{
BindingGroup group = context.Binder.Group(bindingID);
context.Binder.SetGroupContext(true);
aggValue = _aggregate.Apply(context, group.BindingIDs);
context.Binder.SetGroupContext(false);
}
else
{
aggValue = _aggregate.Apply(context);
}
return(aggValue);
}
