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https://issues.apache.org/jira/browse/CAY-2357?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nikita Timofeev closed CAY-2357.
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Resolution: Fixed
Fixed in *4.0* per
https://github.com/apache/cayenne/commit/d51c51a5709611b233c431f15e2beb7c4346dab8
> Generic select queries silently convert result to nulls if no PK column found
> -----------------------------------------------------------------------------
>
> Key: CAY-2357
> URL: https://issues.apache.org/jira/browse/CAY-2357
> Project: Cayenne
> Issue Type: Bug
> Components: Core Library
> Affects Versions: 4.0.B1, 4.1.M1
> Reporter: Nikita Timofeev
> Assignee: Nikita Timofeev
> Priority: Minor
>
> {{SQLTemplate}} by default tries to convert result into object
> ({{selectDataRows}} set to {{false}}),
> however if there are no PK columns for required entity in result this lead to
> {{null}} without any hit to the user. That definitely leads to confusion, see
> this SO question for example
> https://stackoverflow.com/questions/45907666/select-custom-data-with-cayenne-return-empty-lines
>
> Problem is that {{EJBQL}} uses very same logic for result conversion, so this
> should be fixed keeping in mind that {{null}} is a valid result in case of
> some OUTER JOIN, or missing to-one relationship.
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