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https://issues.apache.org/jira/browse/DERBY-3330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12568879#action_12568879
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Anurag Shekhar commented on DERBY-3330:
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Impact of isolation level
The records involved (new record and duplicate ) are always locked for update
which insures that there is exclusive lock on the record , irrespective of the
isolation.
So nothing special need to be done with respect to isolation level.
> provide support for unique constraint over nullable columns
> -----------------------------------------------------------
>
> Key: DERBY-3330
> URL: https://issues.apache.org/jira/browse/DERBY-3330
> Project: Derby
> Issue Type: New Feature
> Components: Store
> Affects Versions: 10.4.0.0
> Environment: all
> Reporter: Anurag Shekhar
> Assignee: Anurag Shekhar
> Attachments: BTreeController.diff, derby-3330-testcase.diff,
> derby-3330.diff, derby-3330v2.diff, derby-3330v3.diff, derby-3330v4.diff,
> derby-3330v5.diff, FunctionalSpec_DERBY-3330-V2.html,
> FunctionalSpec_DERBY-3330.html, UniqueConstraint_Implementation.html
>
>
> Allow unique constraint over nullable field. Right now derby support unique
> constraint only over not null columns.
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