[hibernate-issues] [JIRA] (HHH-16859) max() doesn't work with Enums

Michał Maliszewski ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=5ad7619... ) *updated* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiNTRmMzIyYTBj... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-16859?atlOrigin=eyJpIjoiNTRmMz... ) HHH-16859 ( https://hibernate.atlassian.net/browse/HHH-16859?atlOrigin=eyJpIjoiNTRmMz... ) max() doesn't work with Enums ( https://hibernate.atlassian.net/browse/HHH-16859?atlOrigin=eyJpIjoiNTRmMz... ) Change By: Michał Maliszewski ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=5ad7619... ) 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.atlass...]. ( https://hibernate.atlassian.net/browse/HHH-16859#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16859#add-comment?atlOrigin=ey... ) Get Jira notifications on your phone! Download the Jira Cloud app for Android ( https://play.google.com/store/apps/details?id=com.atlassian.android.jira.... ) or iOS ( https://itunes.apple.com/app/apple-store/id1006972087?pt=696495&ct=Em... ) This message was sent by Atlassian Jira (v1001.0.0-SNAPSHOT#100227- sha1:3bc807d )