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https://issues.apache.org/jira/browse/DERBY-6576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14015985#comment-14015985
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ASF subversion and git services commented on DERBY-6576:
--------------------------------------------------------
Commit 1599383 from [~dagw] in branch 'code/trunk'
[ https://svn.apache.org/r1599383 ]
DERBY-6576 A immediate Fk constraint blows up iff its referenced PK is deferred
and we modify a duplicate key column
Patch derby-6576-forbid-deferred+cascade-set-null-1. It simplifies the
code of the previous patch for thi sissue that handles RESTRICT and NO
ACTION in combination with a deferrable primary key. It also forbids
CASCADE and SET NULL of the target primary key is deferrable, at least
for now until a satisfactory implementation can be found. Test have
been added for the new cases.
> A immediate Fk constraint blows up iff its referenced PK is deferred and we
> modify a duplicate key column
> ---------------------------------------------------------------------------------------------------------
>
> Key: DERBY-6576
> URL: https://issues.apache.org/jira/browse/DERBY-6576
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Reporter: Dag H. Wanvik
> Assignee: Dag H. Wanvik
> Attachments: derby-6576-2.diff, derby-6576-3.diff,
> derby-6576-3.status, derby-6576-cascade-setnull.diff,
> derby-6576-cascade-setnull.status,
> derby-6576-forbid-deferred+cascade-set-null-1.diff,
> derby-6576-forbid-deferred+cascade-set-null-1.status, derby-6576.diff,
> derby-6576.status
>
>
> Similar to the issue in DERBY-6559, except here we modify the key in the
> referenced table. This leads Derby to check for any referencing FK and throw,
> even if there are other (formerly) duplicate rows that satisfy the FK
> constraint.
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