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Posted to dev@openjpa.apache.org by "Catalina Wei (JIRA)" <ji...@apache.org> on 2010/06/12 04:29:12 UTC

[jira] Created: (OPENJPA-1696) Type discriminator for polymorphic queries limited to Single Table inheritance

Type discriminator for polymorphic queries limited to Single Table inheritance
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                 Key: OPENJPA-1696
                 URL: https://issues.apache.org/jira/browse/OPENJPA-1696
             Project: OpenJPA
          Issue Type: Bug
          Components: query
    Affects Versions: 2.0.0
            Reporter: Catalina Wei
            Assignee: Catalina Wei


JPA2.0 spec defines TYPE discriminator which can be used in JPQL query to return polymorphic query results. The spec is unclear that the TYPE discriminator is for Single table inheritance or it can be used for Table per class or inheritance type Joined or not.
The initial implementation in OpenJPA has limited it for Single Table inheritance, but it does not block the usage for the other 2 types of inheritance.
This resulting incorrect SQL generated and SQLExceptions.


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[jira] Resolved: (OPENJPA-1696) Type discriminator for polymorphic queries limited to Single Table inheritance

Posted by "Catalina Wei (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/OPENJPA-1696?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Catalina Wei resolved OPENJPA-1696.
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    Fix Version/s: 2.1.0
       Resolution: Fixed

> Type discriminator for polymorphic queries limited to Single Table inheritance
> ------------------------------------------------------------------------------
>
>                 Key: OPENJPA-1696
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-1696
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: query
>    Affects Versions: 2.0.0
>            Reporter: Catalina Wei
>            Assignee: Catalina Wei
>             Fix For: 2.1.0
>
>
> JPA2.0 spec defines TYPE discriminator which can be used in JPQL query to return polymorphic query results. The spec is unclear that the TYPE discriminator is for Single table inheritance or it can be used for Table per class or inheritance type Joined or not.
> The initial implementation in OpenJPA has limited it for Single Table inheritance, but it does not block the usage for the other 2 types of inheritance.
> This resulting incorrect SQL generated and SQLExceptions.

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