[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-5141) hql group by on multiple classes generates 1 query by class and can return a wrong number of results

hql group by on multiple classes generates 1 query by class and can return a wrong number of results ---------------------------------------------------------------------------------------------------- Key: HHH-5141 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5141 Project: Hibernate Core Issue Type: Bug Components: query-hql Affects Versions: 3.3.0.SP1 Environment: Hibernate Annotations 3.4.0.GA, HSQLDB 1.8.0.10 Reporter: Eric Citaire Priority: Critical The classes DomesticDog and DomesticCat extend / implement Pet. Here is the data of the 2 tables : {{DomesticDog}} {{+----+----------------------+}} {{| 1 | Max |}} {{| 2 | Buddy |}} {{| 3 | Jake |}} {{| 4 | Buddy |}} {{+----+----------------------+}} {{DomesticCat}} {{+----+----------------------+}} {{| 1 | Tiger |}} {{| 2 | Smokey |}} {{| 3 | Tiger |}} {{| 4 | Max |}} {{+----+----------------------+}} Given the HQL query : {{select pet.name from Pet pet group by pet.name having count(pet) > 1}} Two SQL queries are generated and executed separately : {{select domesticdog0_.name as col_0_0_ from DomesticDog domesticdog0_ group by domesticdog0_.name having count(domesticdog0_.id)>1}} {{select domesticcat0_.name as col_0_0_ from DomesticCat domesticcat0_ group by domesticcat0_.name having count(domesticcat0_.id)>1}} It returns only : "Buddy" and "Smokey". But it does not return "Max" wich is the name of a cat and a dog.