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From "Kim Haase (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-4790) Implementation of generated columns is not described
Date Tue, 15 Oct 2013 14:04:42 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4790?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13795200#comment-13795200
] 

Kim Haase commented on DERBY-4790:
----------------------------------

We do not usually provide implementation details in the documentation, since these are subject
to change. We provide information only on user-visible behavior. Anyone can check out the
source code and examine the implementation of the feature, however.

I am inclined to close this issue as Will Not Fix, but I'll modify the documentation if I
learn this would be a useful thing to do. Thanks.

> 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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