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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, 20 Nov 2009 21:21:40 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: d4442-1a.diff
                d4442-1a.stat

Here's an updated patch (d4442-1a.diff). I've added comments to the new methods, updated the
existing comments to better match the current state of the code, updated the DERBY-3 test
case to expect the new behaviour, and also added a test case for DERBY-4433.

> 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
>         Attachments: always_prn.diff, d4442-1a.diff, d4442-1a.stat, 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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