[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-5419) COUNT operator with composite primary key and JPA 2.0 Criteria API produces bad sql

[Anne Buit (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-5419?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=43146#comment-43146 ] 

Anne Buit commented on HHH-5419:
--------------------------------

select count(generatedAlias0) 
from ProjectActivity as generatedAlias0

Using org.hibernate.dialect.SQLServerDialect, this translates into:

select top 2 count((projectact0_.project_id, projectact0_.project_activity_id)) as col_0_0_ 
from project_activity projectact0_

The entire composite primary key is used within the count() operator.

> COUNT operator with composite primary key and JPA 2.0 Criteria API produces bad sql
> -----------------------------------------------------------------------------------
>
>                 Key: HHH-5419
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5419
>             Project: Hibernate Core
>          Issue Type: Bug
>    Affects Versions: 3.5.1, 3.5.2, 3.5.3, 3.5.4, 3.6.0.Beta1
>         Environment: hibernate-entitymanager 3.6.0.Beta1, glassfish 3.0.1, linux ubuntu 10.04, MS SQL Server 2008
>            Reporter: Fabio Braga de Oliveira
>            Priority: Minor
>         Attachments: hibernate-count-bug.zip
>
>
> Hibernate produces a invalid SQL if anyone use the count() operator with the JPA 2.0 Criteria API. Code:
> CriteriaBuilder cb = getEntityManager().getCriteriaBuilder();
> CriteriaQuery<Object[]> cq = cb.createQuery(Object[].class);
> Root<EntityCompositePK> r = cq.from(EntityCompositePK.class);
> cq.multiselect(cb.count(r));
> assertEquals(0, ((Long) (getEntityManager().createQuery(cq).getSingleResult())[0]).intValue());
> I'm sending a little maven project which reproduces the bug.

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