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https://issues.apache.org/jira/browse/OPENJPA-1794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13716694#comment-13716694
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ASF subversion and git services commented on OPENJPA-1794:
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Commit 1506198 from [~techhusky] in branch 'openjpa/trunk'
[ https://svn.apache.org/r1506198 ]
OPENJPA-1794 aggregate function with no result set must return null
> 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
> 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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