Is the following design/query possible with the LLBGEN Framework?

public interface IFoo
{
    string Name {get; set;}
}

public class Foo : IFoo
{
    public string Name {get; set;}
}

public class Foo2 : IFoo
{
    public string Name {get; set;}
}

Context.Query<IFoo>().Where(x => x.Name == "test")

The code should return instances of Foo/Foo2 having a name equal to "test".

Thanks

No, that's not supported, as your system isn't code oriented. Querying by interface means an interface has to be a core citizen of the mapping system which is not something we do as code is (like it's counter part the table) following the definition of the entity, not the other way around.