public object ExecuteExpression(Serialize.Linq.Nodes.ExpressionNode expressionNode)
 {
     using (var session = SessionFactory.OpenSession())
     {
         var query = session.Query<object>();
         var expression = expressionNode.ToExpression(new NHExpressionContext(session));
         var result = query.Provider.Execute(expression);
         IEnumerable enumerable = result as IEnumerable;
         if (enumerable != null)
             return enumerable.Cast<object>().ToArray();
         else
             return result;
     }
 }