[hibernate-issues] [Hibernate-JIRA] Created: (HHH-2831) Native SQL queries with addJoin or <return-join/> return object arrays instead of single Entities

[Jeremy Grodberg (JIRA)]

Native SQL queries with addJoin or <return-join/> return object arrays instead of single Entities
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                 Key: HHH-2831
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2831
             Project: Hibernate3
          Issue Type: Bug
          Components: query-sql
    Affects Versions: 3.2.5, 3.2.4
         Environment: Hibernate 3.2.4.ga and 3.2.5.ga with hsqldb on Win XP
            Reporter: Jeremy Grodberg
         Attachments: NativeSQLQueriesTest.patch

Although the documentation is not crystal clear, I read it to say that using addJoin should eagerly fetch an associated object but should NOT return it as a separate value.  In section 16.1.3. "Handling associations and collections" of the online documentation it says: "It is possible to eagerly join in the Dog to avoid the possible extra roundtrip for initializing the proxy. This is done via the addJoin() method, which allows you to join in an association or collection."  This comes BEFORE the section on returning multiple entities, so I say the documentation at least implies it will only return a single entity at the top level.  Also, if the intention is to return multiple entities, addEntity() works fine for that, so what then would be the difference of addJoin()?  If I'm wrong about what addJoin() should do, please clarify that in the documentation and also clarify how, if it is possible, one could eagerly fetch the association without changing the return type of the quer
 y.

I have reproduced this problem in the Hibernate JUnit tests in 3.2.4.ga and 3.2.5.ga, specifically NativeSQLQueriesTest.testSQLQueryInterface().

I'm attaching a patch to the Hibernate junit test org.hibernate.test.sql.hand.query.NativeSQLQueriesTest.java released in 3.2.5.ga that adds a test to ensure that a query with addJoin only returns a (list of) entities, not a list of Object arrays containing entities.  Currently, the assertion fails because instead of returning a list of Organizations we get a list of Object[3] = { Organization, Employment, Person }, which is exactly what we get when the addJoin()s are replaced with appropriate addEntity() calls.

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