Experimenting a bit more, I'm now even more confused ...
Set<Subscription> set = new HashSet<Subscription>();
Query query = getEM().createQuery("select s from Subscription s
where s.clientId = ?1");
Long cid = client.getId();
query.setParameter(1, cid);
List list = query.getResultList(); // <---------- not empty
set.addAll(list);
query = getEM().createQuery("select s from Subscription s where
s.topicId = ?1");
Long tid = topic.getId();
query.setParameter(1, tid);
list = query.getResultList(); // <---------- same results as
before -- as we have proper "intersection" data
set.addAll(list);
query = getEM().createQuery("select s from Subscription s where
s.clientId = ?1 and s.topicId = ?2");
query.setParameter(1, cid);
query.setParameter(2, tid);
list = query.getResultList(); // <--------- no results?!?
set.addAll(list);
return getSingleResult(set);
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