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https://issues.apache.org/jira/browse/DERBY-3330?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mike Matrigali updated DERBY-3330:
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please update your implementation spec to include your plan for hard upgrade.  
Once this is done it should be easier to 
both review the plan and whether the code does what you have said is the plan.

> 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, derby-3330v6.diff, derby-3330v7.diff, derby-3330v8.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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