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From "Dag H. Wanvik (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-4442) Evaluation of default value and identity in an INSERT result set evaluated too early.
Date Fri, 13 Nov 2009 17:17:39 GMT
Evaluation of default value and identity in an INSERT result set evaluated too early.
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                 Key: DERBY-4442
                 URL: https://issues.apache.org/jira/browse/DERBY-4442
             Project: Derby
          Issue Type: Bug
          Components: SQL
            Reporter: Dag H. Wanvik


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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