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https://issues.apache.org/jira/browse/CAY-2468?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nikita Timofeev closed CAY-2468.
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Resolution: Fixed
https://github.com/apache/cayenne/commit/60c55667568bffaf92f738289a6ca7b2f2b2bc68
> Support subqueries in Expression API
> ------------------------------------
>
> Key: CAY-2468
> URL: https://issues.apache.org/jira/browse/CAY-2468
> Project: Cayenne
> Issue Type: Task
> Components: Core Library, Database integration
> Reporter: Nikita Timofeev
> Assignee: Nikita Timofeev
> Priority: Major
> Fix For: 4.2.M1
>
>
> Currently there is no way to use subqueries in {{SelectQuery}} or
> {{ObjectSelect}}.
> So we need a way to do so in {{Expression}} API.
> Simple version can be implemented like this:
> {code:java}
> ObjectSelect<Painting> subquery = ObjectSelect.query(...);
> long count = ObjectSelect.query(Artist.class)
> .where(ExpressionFactory.exists(subquery))
> .selectCount(context);
> {code}
> Also we need a way to use expressions from top level query in a subquery.
> Maybe it can be new expression (like {{Artist.ARTIST_NAME.enclosing()}})
> In a first iteration this should support {{EXISTS}} and {{IN}} subqueries.
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