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https://issues.apache.org/jira/browse/JCR-2605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12915339#action_12915339
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Randall Hauch commented on JCR-2605:
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Actually, JBoss DNA was renamed to ModeShape in Jan 2010, and the documentation 
for the query languages supported by the latest version of ModeShape (currently 
2.2) is at 
http://docs.jboss.org/modeshape/latest/manuals/reference/html/jcr-query-and-search.html.

In ModeShape, DISTINCT is just added to the SELECT clause as an optional 
keyword (the same as in SQL-92/99). ModeShape does not currently implement 
COUNT() or any other aggregate functions.

> Can we have more jcr-sql2 functions 
> ------------------------------------
>
>                 Key: JCR-2605
>                 URL: https://issues.apache.org/jira/browse/JCR-2605
>             Project: Jackrabbit Content Repository
>          Issue Type: New Feature
>          Components: JCR 2.0
>            Reporter: kaynezhang
>
> Can we have more jcr-sql2 functions in jcr 2.0 like count() distinct()

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