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https://issues.apache.org/jira/browse/DERBY-4790?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rick Hillegas resolved DERBY-4790.
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Resolution: Won't Fix
I agree that this is the sort of implementation detail which the Derby user
docs generally avoid. Closing this as "Won't fix". If more users ask about this
particular implementation detail, then we can consider re-opening this issue.
> Implementation of generated columns is not described
> ----------------------------------------------------
>
> Key: DERBY-4790
> URL: https://issues.apache.org/jira/browse/DERBY-4790
> Project: Derby
> Issue Type: Improvement
> Components: Documentation
> Affects Versions: 10.6.1.0
> Environment: All
> Reporter: Uriah Eisenstein
> Priority: Minor
>
> It is not specified in the documentation whether columns defined with
> "generated always as <expression>" are physically stored in the database and
> take space, or calculated on the fly when read from. I asked about this on
> the mailing list and found that the former is true.
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