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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-4442) Evaluation of default value and identity in an INSERT result set evaluated too early.
Date Mon, 07 Dec 2009 11:55:18 GMT

     [ https://issues.apache.org/jira/browse/DERBY-4442?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Knut Anders Hatlen updated DERBY-4442:
--------------------------------------

    Attachment: backout-derby-4425.diff

The attached patch backs out the fix for DERBY-4425 (except the tests), since it's not needed
anymore. All the regression tests ran cleanly.

> Evaluation of default value and identity in an INSERT result set evaluated too early.
> -------------------------------------------------------------------------------------
>
>                 Key: DERBY-4442
>                 URL: https://issues.apache.org/jira/browse/DERBY-4442
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.5.3.0
>            Reporter: Dag H. Wanvik
>            Assignee: Knut Anders Hatlen
>             Fix For: 10.6.0.0
>
>         Attachments: always_prn.diff, backout-derby-4425.diff, d4442-1a.diff, d4442-1a.stat,
d4442-1b.diff, insert.diff
>
>
> In contrast to generated column, which are evaluated when the next row from the result
set to be inserted, currently default values and identity columns are generated "early", that
is as part of avaluating the subquery (SELECT or VALUES as the case may be). 
> This does not currently cause a user visible bug in Derby, but it lies behind DERBY-3
and the effect Bryan observed in DERBY-4.
> Additionally, "early" computation has given rise to much special handling and ensuing
bugs, cf. DERBY-1644, DERBY-4413, DERBY-4419, DERBY-4425 and others.
> DERBY-4397 requires this fix for correct behaviour with INSERT.
> See also
> https://issues.apache.org/jira/browse/DERBY-4413?focusedCommentId=12769532&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#action_12769532

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