How to do a search with multiple ElementCollections - jpa

Question

Given the following entity:
#Entity
#Table(name = "subscription")
public class Subscription implements Serializable {
private static final long serialVersionUID = 1L;
#ElementCollection
#CollectionTable(joinColumns= #JoinColumn(name="subscription"))
private Set<Code> mainCodes = new HashSet<>();
#ElementCollection
#CollectionTable(joinColumns= #JoinColumn(name="subscription"))
private Set<Code> otherCodes = new HashSet<>();
}
So a Subscription can have zero or more mainCodes or otherCodes it's interested in. I can get hold of the mainCode and otherCode of a certain object that passes by. The codes themselves are embeddables with only single String fields.
How do I create a JPA Query (or CriteriaBuilder) which searches in these collections with an "OR" mechanism?
So basically I'm looking for a query like this:
select s from subscription s where :myMainCode IN s.mainCodes OR :otherCode IN s.otherCodes
Is something like this doable with CriteriaBuilder or do I need to use a more explicit query? If so, what does the query look like?
EDIT: Tried this with CriteriaBuilder:
final CriteriaBuilder cb = this.entityManager.getCriteriaBuilder();
final CriteriaQuery<Subscription> cq = cb.createQuery(Subscription.class);
final Root<Subscription> root = cq.from(Subscription.class);
final Expression<Collection<Code>> mainCodes = root.get("mainCodes");
final Predicate containsMainCode = cb.isMember(obj.getClassCode(), mainCodes);
final Expression<Collection<Code>> otherCodes = root.get("otherCodes");
final Predicate containsOtherCode = cb.isMember(obj.getOtherCode(), otherCodes);
final Predicate searchPredicate = cb.or(containsMainCode, containsOtherCode);
cq.select(root).where(searchPredicate);
However, this creates an inner join of both collections involved, meaning that it will return no results if there is a row for mainCode, but not for otherCode in the database, it generates this query:
SELECT t0.ID
FROM Subscription_OTHERCODES t2, Subscription_MAINCODES t1, subscription t0
WHERE ((t1.CODESYSTEM = ?) AND (t1.CODE = ?)) OR ((t2.CODESYSTEM = ?) AND (t2.CODE = ?))) AND ((t1.subscription = t0.ID) AND (t2.subscription = t0.ID))
So even if it finds a matching mainCode, it fails if it doesn't have any otherCode.

Answer 1

It is other way around that in your example.
For example if the code has name property):
select s from Subscription s left join s.mainCodes m left join s.otherCodes o
where m.name IN :myMainCode or o.name IN :myOtherCode