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https://issues.apache.org/jira/browse/OPENJPA-1575?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pinaki Poddar resolved OPENJPA-1575.
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Resolution: Fixed
> Query parameter on externalized field breaks Prepared Query Cache
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>
> Key: OPENJPA-1575
> URL: https://issues.apache.org/jira/browse/OPENJPA-1575
> Project: OpenJPA
> Issue Type: Bug
> Components: kernel, query
> Affects Versions: 2.0.0-beta2
> Reporter: Pinaki Poddar
> Assignee: Pinaki Poddar
> Fix For: 2.0.0
>
>
> If field value has been externalized and the query is using a parameter for
> that field, caching its SQL breaks because re-parametrization of the SQL can
> not externalize the user supplied parameter value through the field. The
> worse is the query is cached anyway and its parameter substituted with
> (wrong) non-externalized, user-supplied value -- resulting in wrong result.
> Currently we will detect such usage and exclude the the query being cached.
> However, we can consider a mechanics to capture the parametrized fields in a
> query expression tree and appropriately pass the user values through the
> fields' externalizer in future.
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