[hibernate-issues] [Hibernate-JIRA] Created: (HHH-6911) Write DiscriminatorValue to DiscriminatorColumn when combined with InheritanceType#JOINED

[Steve Ebersole (JIRA)]

Write DiscriminatorValue to DiscriminatorColumn when combined with InheritanceType#JOINED
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                 Key: HHH-6911
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-6911
             Project: Hibernate Core
          Issue Type: Improvement
          Components: annotations, metamodel
            Reporter: Steve Ebersole
            Priority: Minor


The JPA spec states that {{DiscriminatorColumn}} can be used in conjunction with JOINED inheritence.  The only section that seems to deal with this combination is _11.1.10 DiscriminatorColumn Annotation_ where it says
{quote}
For the SINGLE_TABLE mapping strategy, and typically also for the JOINED strategy, the persistence
provider will use a type discriminator column. The DiscriminatorColumn annotation is used to
define the discriminator column for the SINGLE_TABLE and JOINED inheritance mapping strategies.
{quote}

Apparently this is meant to imply that even if providers do not need/use the discriminator for concrete class resolution (reading) they are still expected to write it out to the database.  Dunno, thats just what we have been told :)

Anyway, like I said, Hibernate itself does not need the discriminator column/value to interpret the concrete classes.  However, in the interest of portability we certainly *could* write it out.  Longer term


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