NHibernate: CreateCriteria and Exists clause

Question

How can I write the following SQL using CreateCriteria:

SELECT * FROM FooBar fb
WHERE EXISTS (SELECT FooBarId FROM Baz b WHERE b.FooBarId = fb.Id)

Answer 1

I worked out how to do this using the IsNotEmpty expression. Here it is using NHibernate Lambda Extensions:

Session.CreateCriteria()
    .Add(SqlExpression.IsNotEmpty(x => x.Bazes))
    .List();