Order by in CTE causes ArgumentException

[terrajobst]

Ported from CodePlex

WITH test AS (
 SELECT TOP 1
   e.FirstName AS test,
   e.LastName AS f,
   e.Extension
 FROM Employees e

 ORDER BY 1
)
SELECT t.f
FROM test t

System.ArgumentException: IComparer (or the IComparable methods it relies upon) did not return zero when Array.Sort called x. CompareTo(x). x: 'System.Object[]'  x's type: 'Object[]' The IComparer: 'NQuery.Runtime.ExecutionPlan.SortIterator+RowComparer'.
   at System.Collections.Generic.ArraySortHelper1.SwapIfGreaterWithItems[TValue](T[] keys, TValue[] values, IComparer1 comparer, Int32 a, Int32 b)
   at System.Collections.Generic.ArraySortHelper1.QuickSort[TValue](T[] keys, TValue[] values, Int32 left, Int32 right, IComparer1 comparer)
   at System.Collections.Generic.ArraySortHelper1.Sort[TValue](T[] keys, TValue[] values, Int32 index, Int32 length, IComparer1 comparer)
   at System.Collections.Generic.ArraySortHelper1.Sort(T[] items, Int32 index, Int32 length, IComparer1 comparer)
   at System.Array.Sort[T](T[] array, Int32 index, Int32 length, IComparer1 comparer)    at System.Collections.Generic.List1.Sort(Int32 index, Int32 count, IComparer1 comparer)    at System.Collections.Generic.List1.Sort(IComparer`1 comparer)
   at NQuery.Runtime.ExecutionPlan.SortIterator.SortInput() in N:\Trunk\Src\NQuery\Execution Plan\SortIterator.cs:line 100
   at NQuery.Runtime.ExecutionPlan.SortIterator.Read() in N:\Trunk\Src\NQuery\Execution Plan\SortIterator.cs:line 113
   at NQuery.Runtime.ExecutionPlan.StatisticsIterator.Read() in N:\Trunk\Src\NQuery\Execution Plan\StatisticsIterator.cs:line 25
   at NQuery.Runtime.ExecutionPlan.TopIterator.Read() in N:\Trunk\Src\NQuery\Execution Plan\TopIterator.cs:line 23
   at NQuery.Runtime.ExecutionPlan.StatisticsIterator.Read() in N:\Trunk\Src\NQuery\Execution Plan\StatisticsIterator.cs:line 25
   at NQuery.Runtime.ExecutionPlan.ResultIterator.Read() in N:\Trunk\Src\NQuery\Execution Plan\ResultIterator.cs:line 18
   at NQuery.Query.ExecuteDataTable() in N:\Trunk\Src\NQuery\API\Query.cs:line 133
   at NQuery.Gui.QueryDocument.Execute() in N:\Trunk\Src\NQuery.Gui\QueryDocument.cs:line 196
   at NQuery.Gui.QueryDocument.NQuery.Gui.IQueryHandler.Execute() in N:\Trunk\Src\NQuery.Gui\QueryDocument.cs:line 135
   at NQuery.Gui.MainForm.executeToolStripMenuItem_Click(Object sender, EventArgs e) in N:\Trunk\Src\NQuery.Gui\MainForm.cs:line 282
   at System.Windows.Forms.ToolStripItem.RaiseEvent(Object key, EventArgs e)
   at System.Windows.Forms.ToolStripMenuItem.OnClick(EventArgs e)
   at System.Windows.Forms.ToolStripItem.HandleClick(EventArgs e)
   at System.Windows.Forms.ToolStripMenuItem.ProcessCmdKey(Message& m, Keys keyData)
   at System.Windows.Forms.ToolStripManager.ProcessShortcut(Message& m, Keys shortcut)
   at System.Windows.Forms.Form.ProcessCmdKey(Message& msg, Keys keyData)
   at System.Windows.Forms.ContainerControl.ProcessCmdKey(Message& msg, Keys keyData)
   at TD.SandDock.DocumentContainer.ProcessCmdKey(Message& msg, Keys keyData)
   at System.Windows.Forms.ContainerControl.ProcessCmdKey(Message& msg, Keys keyData)
   at TD.SandDock.DockControl.ProcessCmdKey(Message& msg, Keys keyData)
   at System.Windows.Forms.ContainerControl.ProcessCmdKey(Message& msg, Keys keyData)
   at System.Windows.Forms.Control.PreProcessMessage(Message& msg)
   at System.Windows.Forms.Control.PreProcessControlMessageInternal(Control target, Message& msg)
   at System.Windows.Forms.Application.ThreadContext.PreTranslateMessage(MSG& msg)

[dallmair]

Works fine in v.Next.