[hibernate-issues] [Hibernate-JIRA] Created: (HHH-5179) Criteria Projections.countDistinct() does not work for composite IDs or components for some dialects

[Gail Badner (JIRA)]

Criteria Projections.countDistinct() does not work for composite IDs or components for some dialects
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                 Key: HHH-5179
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5179
             Project: Hibernate Core
          Issue Type: Improvement
          Components: query-criteria
    Affects Versions: 3.5.1
         Environment: hsqldb, mssql
            Reporter: Gail Badner
            Assignee: Gail Badner
            Priority: Minor


Criteria Projections.countDistinct() does not work for composite IDs or compenents if the dialect only supports SELECT COUNT( DISTINCT ... ) with only 1 argument.

According to http://msdn.microsoft.com/en-us/library/ms175997.aspx , a SQL workaround is:

SELECT COUNT(*) FROM (SELECT DISTINCT authorFirstName, authorLastName, authorMiddleName, authorId from Authors) as foo

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