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From "Anurag Shekhar (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3330) provide support for unique constraint over nullable columns
Date Wed, 27 Feb 2008 19:15:51 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12573032#action_12573032
] 

Anurag Shekhar commented on DERBY-3330:
---------------------------------------

dml019 test group by clause of unique constraint. When unique constraint 
was backed by unique index, distinct scan  was used but after making it non 
unique constraint this was not the case so the results are not ordered. 

I have checked the test suite from nist web site and it mandates only 
number of rows and not their sequence. 

> 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, derby-3330v9.diff, 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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