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From "Anurag Shekhar (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-3330) provide support for unique constraint over keys that include one or more nullable columns.
Date Thu, 06 Mar 2008 13:52:58 GMT

     [ https://issues.apache.org/jira/browse/DERBY-3330?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Anurag Shekhar updated DERBY-3330:
----------------------------------

    Attachment: derby-3330_followup_1.diff

Issues addressed in derby-3330_followup_1.diff

CreateIndexConstantAction.java 

I have changed the name of the variable and added comment to explain what its meant for.
I got confused while commenting last time. This property is required if 
TransactionCoordinator has to select the non default Sorter.

sort changes

I have updated compare method and it doesn't need to assume location column. But it still
has information about nulls not being equal. 
I am checking how to remove this information from comparison. It appears to me that I can
remove 
this custom compare method and use the existing but that miy need some change which might
effect 
other part of code.I will wait for 10.4 branching and will work for it in the trunk.



BTreeController.java

I haven't optimized it yet. But instead of returning error code setting the ret value so the
latch 
is cleared before return.


IndexDescriptorImpl.java

Updated both the place (using new name in toString () and using the new attribute in equals
methods).

BTreeController.java
I am still checking it out and will submit new follow up if I find any problem areas.

junit suites.All is running without any failure with this patch.

> provide support for unique constraint over keys that include one or more 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-v2.diff, db2Compatibility.diff,
derby-3330-testcase.diff, derby-3330-UpgradeTests.diff, derby-3330.diff, derby-3330_followup_1.diff,
derby-3330v10.diff, derby-3330v11.diff, derby-3330v12.diff, derby-3330v13.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 keys which include one or more nullable fields.  Prior to
this change Derby only supported unique constraints on keys that included no nullable columns.
 The new constraint will allow unlimited inserts of any key with one more null columns, but
will limit insert of keys with no null columns to 1 unique value per table.
> There is no change to existing or newly created unique indexes on null columns (as opposed
to unique constraints on null columns).  Also there is no change to existing or newly created
constraints on keys with no nullable columns.

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