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https://issues.apache.org/jira/browse/CAY-2906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18044191#comment-18044191
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Nikita Timofeev commented on CAY-2906:
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https://github.com/apache/cayenne/commit/b64f1d6d16dab73c34d3e261d76461796623e16d
> In-memory evaluation of `(not) exists` expressions
> --------------------------------------------------
>
> Key: CAY-2906
> URL: https://issues.apache.org/jira/browse/CAY-2906
> Project: Cayenne
> Issue Type: Task
> Components: Core Library
> Affects Versions: 4.2.2, 5.0-M1
> Reporter: Nikita Timofeev
> Assignee: Nikita Timofeev
> Priority: Major
> Fix For: 5.0-M2
>
>
> We got advanced logic for (not)exists in 5.0, and that is a straight-forward
> way of evaluating in-memory. However older variant with a random sub-query is
> a trickier to implement, so it could be not feasible to do in 4.2.
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