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https://issues.apache.org/jira/browse/OPENJPA-2544?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14220353#comment-14220353
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Rick Curtis commented on OPENJPA-2544:
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The link you posted doesn't have a criteria query, it just uses JPQL.... and it
seems to work against trunk?
> OpenJPA should allow null value as surrogate for an empty collection or array
> in queries
> ----------------------------------------------------------------------------------------
>
> Key: OPENJPA-2544
> URL: https://issues.apache.org/jira/browse/OPENJPA-2544
> Project: OpenJPA
> Issue Type: Improvement
> Components: criteria
> Affects Versions: 2.3.0
> Reporter: Thomas Darimont
> Priority: Minor
>
> Hibernate and EclipseLink support null to be used as a surrogate for an empty
> collection in CriteriaQueries.
> Would be great to have that in OpenJPA as well - sadly the JPA spec isn't
> that clear on this...
> I added a test case that reproduces the issue:
> https://gist.github.com/thomasdarimont/b8d4f01b0e66bcdb2560
> See: shouldSupportNullValueAsASubstituateForAnEmptyParameterList
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