works well :)

PoweredSoft.DynamicLinq/Parser/ExpressionParser.cs

@@ -11,6 +11,7 @@ namespace PoweredSoft.DynamicLinq.Parser
         public ParameterExpression Parameter { get; protected set; }
         public string Path { get; set; }
         public List<ExpressionParserPiece> Pieces { get; set; } = new List<ExpressionParserPiece>();
+        public bool IsParsed => Pieces?.Count > 0;
 
         public ExpressionParser(Type type, string path) : this(Expression.Parameter(type), path)
         {

PoweredSoft.DynamicLinq/Parser/ExpressionParserPieceGroup.cs

@@ -14,11 +14,6 @@ namespace PoweredSoft.DynamicLinq.Parser
 
 #if DEBUG
         public override string ToString() => $"{Parameter?.ToString()} is {Parameter?.Type} | {(Pieces == null ? "" : string.Join(" -> ", Pieces.Select(t2 => t2.ToString())))}";
-
-        public object CompileSimpleExpress(SelectNullHandling nullHandling)
-        {
-            throw new NotImplementedException();
-        }
 #endif
     }
 }