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User-Agent: Mozilla/5.0 Galeon/1.2.9 (X11; Linux i686; U;) Gecko/20030314

Description of problem:
It does not appear to be possible to specifiy a path to a link attribute for the
addOrder(String) method of DataQuery. Consider the following example (against
the Troika categorization object model):

     Category theCategory = new Category(new OID(Category.BASE_DATA_OBJECT_TYPE,
new BigDecimal(531)));
     DataCollection events =
SessionManager.getSession().retrieve("com.arsdigita.cms.contenttypes.Event");
     events.addEqualsFilter("parent.categories.id", theCategory.getID());
     events.addEqualsFilter("language", "en");
     events.addOrder("parent.categories.link.sortKey");

while (events.next()) {
    DataObject o = events.getDataObject();
    System.err.println(o.getOID());
}

This generates an exception:

com.arsdigita.persistence.PersistenceException:  (root cause:
com.redhat.persistence.engine.rdbms.QGen$5: unknown value in expression:
parent.categories.link.sortKey
query signature: com.arsdigita.cms.contenttypes.Event(id, objectType,
displayName, defaultDomainClass, isDeleted, version, name, language, ancestors,
title, launchDate, startDate, endDate, startTime, endTime, eventDate, location,
lead, mainContributor, eventType, mapLink, cost))
	at
com.arsdigita.persistence.PersistenceException.newInstance(PersistenceException.java:137)
	at
com.arsdigita.persistence.PersistenceException.newInstance(PersistenceException.java:109)
	at com.arsdigita.persistence.DataQueryImpl.next(DataQueryImpl.java:458)


Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1. Write a query similar to above code fragment
2. Try to run it
    

Additional info: