[hibernate-issues] [Hibernate-JIRA] Created: (HCANN-32) Discriminator for Single table per class hierarchy (2.2.4.2) should be optional

[Tobias Marx (JIRA)]

Discriminator for Single table per class hierarchy (2.2.4.2)  should be optional
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                 Key: HCANN-32
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HCANN-32
             Project: Hibernate Commons Annotations
          Issue Type: Improvement
    Affects Versions: 3.2.0
            Reporter: Tobias Marx


If a Single table per class inheritance is used for cases as shown in the documentation, this makes perfect sense to need a Discriminator column.

However, in many scenarios, no Discriminator is needed as there will only different represenations of the same object.

Example:

One library defines a User entity.

In order to separate different Security implementations from each other, another library can extend this User Object, e.g.
as an ExtendedUser.

Some classes will query the table with less columns and call it "User" - some will query the same table in parallel as "ExtendendUser" - so no discriminator is needed - and adding an additional column makes now sense.

The colunns needed are already defined in the entities themselves.

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