fix of object member reference

LINQ/LINQ/Interpreter/Expressions/BinaryExpression.vb

@@ -36,6 +36,11 @@ Namespace Interpreter.Expressions
                 Case ">" : Return x > y
                 Case "<" : Return x < y
                 Case "=" : Return x = y
+
+                Case ">=" : Return x >= y
+                Case "<=" : Return x <= y
+                Case "<>" : Return x <> y
+
                 Case Else
                     Throw New NotImplementedException
             End Select

LINQ/LINQ/Interpreter/Expressions/MemberReference.vb

@@ -1,4 +1,5 @@
 Imports LINQ.Runtime
+Imports Microsoft.VisualBasic.My.JavaScript
 Imports any = Microsoft.VisualBasic.Scripting
 
 Namespace Interpreter.Expressions
@@ -23,6 +24,13 @@ Namespace Interpreter.Expressions
         Public Overrides Function Exec(env As Environment) As Object
             Dim symbol As Object = Me.symbol.Exec(env)
 
+            If symbol Is Nothing Then
+                Throw New NullReferenceException
+            End If
+
+            If TypeOf symbol Is JavaScriptObject Then
+                Return DirectCast(symbol, JavaScriptObject)(memberName)
+            End If
 
             Throw New NotImplementedException()
         End Function

LINQ/LINQ/Runtime/DataSourceDriver.vb

@@ -9,7 +9,7 @@ Namespace Runtime
 
     End Class
 
-    Public Class CsvDataFrameDriver : Inherits DataSourceDriver
+    Public Class DataFrameDriver : Inherits DataSourceDriver
 
         Public Overrides Iterator Function ReadFromUri(uri As String) As IEnumerable(Of Object)
             Dim dataframe As DataFrame = DataFrame.Load(uri)

LINQ/LINQ/Runtime/Registry.vb

@@ -13,7 +13,7 @@
 
         Public Function GetReader(type As String) As DataSourceDriver
             If type = "row" Then
-                Return New CsvDataFrameDriver
+                Return New DataFrameDriver
             Else
                 Throw New MissingPrimaryKeyException
             End If