Bug 441544

Summary:	TREAT() table per class inheritance strategy support
Product:	z_Archived	Reporter:	David Winters <dwinters>
Component:	Eclipselink	Assignee:	Nobody - feel free to take it <nobody>
Status:	NEW ---	QA Contact:
Severity:	enhancement
Priority:	P3	CC:	asafbennatan, dwinters
Version:	unspecified	Keywords:	api
Target Milestone:	---
Hardware:	All
OS:	Unix All
Whiteboard:

Description David Winters

2014-08-11 16:07:53 EDT

In EclipseLink 2.5.2, using the TREAT() operator in a query on entities which use the inheritance strategy table per class does not work. Since support for table per class is optional in the JPA 2.1 specification, it has not been implemented it would appear in EclipseLink. I have tested with the latest EclipseLink version 2.5.2. It does not work for single-table and joined inheritance strategies since they both use an inheritance policy rather than an interface policy which is used for entities with  an inheritance strategy table per class. Please see defect 374771 for reference whereby support for the TREAT operator was implemented in EclipseLink 2.5.1 to comply with the JPA 2.1 specification. An implementation for entities using the ihnertiance strategy table per class should be also provided so that one can downcast types using this inheritance strategy.

Comment 1 David Winters

2014-08-11 16:13:30 EDT

Just to clarify, using the TREAT operator on queries work for single-table and joined inheritance strategies since they both use an inheritance policy rather than an interface policy which is used for entities with an inheritance strategy table per class.

Comment 2 Asaf Natan

2016-10-03 09:58:47 EDT

any news regarding this feature ?

Comment 3 Eclipse Webmaster

2022-06-09 10:19:38 EDT

The Eclipselink project has moved to Github: https://github.com/eclipse-ee4j/eclipselink