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https://issues.apache.org/jira/browse/OPENJPA-961?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12689960#action_12689960
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Catalina Wei commented on OPENJPA-961:
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An element collection can be in an entity or an embeddable object.
JPA2 query support for element collection within an entity is checked in under
revision r758868,
but element collection withiin an embeddable object is not available until we
first add the support for navigation thru embeddable object - a new
functionality in JPA2.0 Spec.
> Support projection of element collection from a JPQL query
> ----------------------------------------------------------
>
> Key: OPENJPA-961
> URL: https://issues.apache.org/jira/browse/OPENJPA-961
> Project: OpenJPA
> Issue Type: Sub-task
> Components: jpa
> Affects Versions: 2.0.0
> Reporter: Jeremy Bauer
> Assignee: Catalina Wei
>
> This task is to support projection of element collection elements within a
> JPQL query. Ex. (SELECT b FROM ColEnt a JOIN a.coll b) where coll is an
> element collection within entity A. There are some assertions commented out
> in TestOrderColumn.java that use JPQL for validation. They can be used to
> help test this task.
> // This validator is disabled until INDEX projection supports element
> // collections
> // validateIndexAndValues(em, "BaseTestEntity", "collelems", 10,
> // new Object[] { elems[0], elems[1], elems[2]} "id",
> // bte.getId());
> and
> // This validator is disabled until INDEX projection supports element
> // collections
> // validateIndexAndValues(em, "Owner", "bikeColl", 0,
> // bikeArr, "id",
> // oid);
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