Question

What is the QueryOver API equivalent of a WITH clause in HQL? I have not been able to find one.

Answer 1

Using the same naming in the example you link to:

Animal m = null;
Animal a = null;
var query = session.QueryOver<Animal>(() => a)
          .Inner.JoinAlias(()=> a.mother, ()=> m, ()=> m.bodyWeight < someLimit);