Assuming we have the following entity:
{code:java}@Entity
@Table(name = "SOME_TABLE")
public class SomeDbo {
@Id
@Column(name = "ID", nullable = false)
private Long id;
@Column(name = "SOME_ENUM")
@Enumerated(EnumType.ORDINAL)
private ESomeEnum type;
// ...
}{code}
and the following Data Access Object with a Query:
{code:java}@Repository
@ApplicationScope
public interface SomeDao {
@Query("select distinct s.id, max(s.type) as mx from SomeDbo s group by s.id order by mx")
List<Object[]> findSomeMax();
}{code}
would provide to the following exception:
{noformat}org.hibernate.QueryException: Parameter 1 of function max() has type COMPARABLE,
but argument is of type com.some.enum.ESomeEnum{noformat}
This is a bit unpleasant as it was working well with Hibernate 5.6.x and still usage of:
{code:java} @Query("select s from SomeDbo s where s.type = 1")
List<SomeDbo> findSomeOfTypeOne();{code}
works fine in Hibernate 6.2.5. The possible workaround I see for now is by doing:
{ noformat code:java } @Query("select distinct s.id, max(cast(s.type as Integer) as mx from SomeDbo s group by s.id order by mx")
List<Object[]> findSomeMax();{ noformat code }
instead, which obviously changed the Object[1] type which needs to be converted in the code back to ESomeEnum type.
It seems that Enum handling needs improvements, as I see several similar issues, e.g. [https://hibernate.atlassian.net/browse/HHH-16445|https://hibernate.atlassian.net/browse/HHH-16445|smart-link]. |
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