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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 Fri, 27 Nov 2009 15:42:20 GMT

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

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

    Issue & fix info: [Patch Available]

The patch is ready for review, so I'm setting "Patch Available". We should probably wait for
DERBY-4426 to be fixed before the patch is committed to prevent exposing the NPEs mentioned
earlier.

> 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
>            Reporter: Dag H. Wanvik
>            Assignee: Knut Anders Hatlen
>         Attachments: always_prn.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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