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https://issues.apache.org/jira/browse/OPENJPA-1794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13786520#comment-13786520
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ASF subversion and git services commented on OPENJPA-1794:
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Commit 1529267 from [~jpaheath] in branch 'openjpa/branches/2.2.1.x'
[ https://svn.apache.org/r1529267 ]
OPENJPA-1794: Return null, rather than 0, on MAX function - back ported to
2.2.1.x Jeremy Bauer's commit to trunk.
> Result of aggregate function MAX is 0 on empty table (instead of NULL).
> -----------------------------------------------------------------------
>
> Key: OPENJPA-1794
> URL: https://issues.apache.org/jira/browse/OPENJPA-1794
> Project: OpenJPA
> Issue Type: Bug
> Components: query
> Affects Versions: 2.0.0
> Reporter: Vera Filippova
> Assignee: Jeremy Bauer
> Fix For: 2.2.3
>
> Attachments: OPENJPA-1794.patch
>
>
> Below is a snippet of a test case... the max should be null, but is zero.
> Object count = em.createQuery("Select count(p.pk) from Entity1 p
> where 1=1").getSingleResult();
> Object max = em.createQuery("Select max(p.pk) from Entity1 p
> where 1=1").getSingleResult();
> System.out.println("count:"+count+ " max:"+max);
> > count:0 max:0
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