[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-5305) selecting elements from a collection of elements fails strangely

selecting elements from a collection of elements fails strangely ---------------------------------------------------------------- Key: HHH-5305 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5305 Project: Hibernate Core Issue Type: Improvement Components: query-hql Affects Versions: 3.5.1 Environment: PostgreSQL / hsqldb Reporter: Karsten Behrmann Original Estimate: 6h Remaining Estimate: 6h The query "select el from Foo f join f.elements el" produces a SQL select clause for merely "elements.id" (though joined correctly), if "elements" is a set of composite-element. It should rather select for all properties of the composite-element. Effect: - If there is no column called "id", the query fails database parse (provoke by explicitly doing <key column="fooID" />) - If the composite-element has more than one property, hibernate ResultSet parsing fails asking for missing col_0_1_ - If the composite-element has one property, assignment-compatible with whatever the database column "id" happens to be, the query succeeds, returning a list of elements with the property set to the value of "id". So it seems like support is almost there. This may be a regression, or a not-quite-completed feature. Succeeding quietly with bad data is Not Good, but the case should not occur much in practice (composite-element with one property is not very useful). Workaround: explicitly select each property, as in "select el.name, el.created, el.importance from Foo f join f.elements el" and manually instantiate the element class. (This seems to still fail on <any> properties, but that is probably an unrelated problem)