[hibernate-issues] [Hibernate-JIRA] Created: (HHH-3534) Subqueries with DetachedCriteria use erroneous alias since version 3.2.6.ga

[Eirik Maus (JIRA)]

Subqueries with DetachedCriteria use erroneous alias since version 3.2.6.ga
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                 Key: HHH-3534
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3534
             Project: Hibernate Core
          Issue Type: Bug
          Components: query-criteria
    Affects Versions: 3.3.1, 3.3.0.GA, 3.2.6
         Environment: Hibernate versions 3.2.6, 3.3.0.GA, 3.3.1.GA. 
Databases Hsql 1.8.0.1 and H2 1.1.100 both in in-memory mode. 
H2 and HSQL sql dialects. 
Sun JDK 1.6.0 (several versions), both Linux and Windows OS. 
            Reporter: Eirik Maus


When creating a query with a sub-query based on a DetachedCriteria, like in Don Mitchels comment of 2007-05-15 to issue HHH-952, default alias (using the single-parameter factory method of DetachedCriteria) for the detached criteria object will be the same as the alias for the root object of the root criteria ("this_"). This obviously cannot work as expected. 

The error was introduced in Hibernate 3.2.6.ga. Versions 3.2.4 and 3.2.5 does not have this problem.

A workaround is to specify an alias different than "this_" (and any other expected query alias) for the DetachedCriteria. As a consequence, the method DetachedCriteria.forClass(SomeClass.class) cannot be used at all since version 3.2.6.ga. An alias must be specified (and it must be different from "this_" ).

A solution would make the DetachedCriteria cooperate with its root Criteria to find an unused alias name. Typically, the query for the main Criteria will already use some aliases based on the same table in eager-loaded joins, so some form of cooperation or subquery alias prefix scheme must be used. 


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