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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