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Posted to derby-dev@db.apache.org by "Lily Wei (JIRA)" <ji...@apache.org> on 2010/07/02 00:00:55 UTC
[jira] Reopened: (DERBY-4442) Evaluation of default value and
identity in an INSERT result set evaluated too early.
[ https://issues.apache.org/jira/browse/DERBY-4442?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Lily Wei reopened DERBY-4442:
-----------------------------
Reopen to 10.5 back port
> 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: 10.6.1.0
>
> 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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