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https://issues.apache.org/jira/browse/JDO-643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12970806#action_12970806
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Michael Bouschen commented on JDO-643:
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I agree, avg(expression) should return
- Double for integral types (byte, short, int, long), float, double and their
wrapper classes
- BigDecimal for BigInteger and BigDecimal
Two remarks:
- We need to point out that this is an incompatible change, meaning a valid JDO
3.0 query might run into a RuntimeException.
- JPA always uses Double as return type
> avg return type
> ---------------
>
> Key: JDO-643
> URL: https://issues.apache.org/jira/browse/JDO-643
> Project: JDO
> Issue Type: Bug
> Components: specification
> Affects Versions: JDO 2 maintenance release 2
> Reporter: Guido Anzuoni
> Assignee: Michael Bouschen
> Fix For: JDO 3 maintenance release 1
>
>
> Aggregate type specification at page 175 claims that avg(expression) return
> type is the same of the enclosed expression.
> This is wrong from a strictly mathematical point of view.
> In fact, if you select an avg on an int field member the result is truncated.
> The result type should always be double.
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