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https://issues.apache.org/jira/browse/DERBY-3330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12573369#action_12573369
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Anurag Shekhar commented on DERBY-3330:
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uniqueWhenNotNull attribute (in B2I and IndexDescritor) is ignored if isUnique
is true. uniqueWhenNotNull is effective only if the the index is non unique
type.
I will add this explanation in comments.
> 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, db2Compatibility.diff,
> derby-3330-testcase.diff, derby-3330.diff, derby-3330v10.diff,
> derby-3330v11.diff, derby-3330v12.diff, derby-3330v2.diff, derby-3330v3.diff,
> derby-3330v4.diff, derby-3330v5.diff, derby-3330v6.diff, derby-3330v7.diff,
> derby-3330v8.diff, derby-3330v9.diff, derbyall_report.txt,
> FunctionalSpec_DERBY-3330-V2.html, FunctionalSpec_DERBY-3330.html,
> UniqueConstraint_Implementation.html,
> UniqueConstraint_Implementation_V2.html,
> UniqueConstraint_Implementation_V3.html
>
>
> Allow unique constraint over nullable field. Right now derby support unique
> constraint only over not null columns.
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