Get the Sql operator to use for the LePropertyExpression.
            
Namespace: NHibernate.CriterionAssembly: NHibernate (in NHibernate.dll) Version: 3.2.0.4000 (3.2.0.4000)
Syntax
| C# | 
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protected override string Op { get; }  | 
| Visual Basic | 
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Protected Overrides ReadOnly Property Op As String Get  | 
| Visual C++ | 
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protected: virtual property String^ Op { String^ get () override; }  |