Criteria Desconsiderando acento(postgres)

Criteria criteria = getSession().createCriteria(Aluno.class, "a");

ProjectionList retorno = Projections.projectionList().create();

retorno.add(Projections.property("a.id"), "id");
retorno.add(Projections.property("a.nome"), "nome");

criteria.setProjection(retorno);

criteria.add( Restrictions.sqlRestriction("to_ascii({alias}.nome) ilike to_ascii(?)", "%jose%", Hibernate.STRING));

criteria.setResultTransformer(new AliasToBeanResultTransformer(Aluno.class));
Collection alunos = criteria.list();

System.out.println(alunos.size());

// CONSOLE:
// select
// this_.id as y0_,
// this_.nome as y1_
// from
// Aluno this_
// where
// to_ascii(this_.nome) ilike to_ascii(?)

}