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https://issues.apache.org/jira/browse/OPENJPA-492?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Patrick Linskey resolved OPENJPA-492.
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    Resolution: Fixed

> JPQL extension: scalar functions in SELECT
> ------------------------------------------
>
>                 Key: OPENJPA-492
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-492
>             Project: OpenJPA
>          Issue Type: New Feature
>    Affects Versions: 0.9.0, 0.9.6, 0.9.7, 1.0.0, 1.0.1
>            Reporter: Patrick Linskey
>             Fix For: 1.1.0
>
>
> JPQL does not allow scalar functions to be used in SELECT clauses. This can 
> be useful in and of itself. Additionally, relational databases typically 
> require that any functions used in a GROUP BY or ORDER BY clause are also 
> used in the SELECT clause; paralleling this in JPQL seems to make sense.
> Example:
> select substring(o.stringField, 1, 1), count(o) from AllFieldTypes o
>     group by substring(o.stringField, 1, 1)

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