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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-6882) Add functionality to ALTER TABLE: switch from GENERATED ALWAYS to GENERATED BY DEFAULT
Date Sat, 09 Apr 2016 17:54:25 GMT

    [ https://issues.apache.org/jira/browse/DERBY-6882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15233665#comment-15233665
] 

ASF subversion and git services commented on DERBY-6882:
--------------------------------------------------------

Commit 1738368 from [~rhillegas] in branch 'code/trunk'
[ https://svn.apache.org/r1738368 ]

DERBY-6882: Add ALTER TABLE ALTER COLUMN ... SET GENERATED functionality, which switches an
identity column from ALWAYS to BY DEFAULT and vice-versa.

> Add functionality to ALTER TABLE: switch from GENERATED ALWAYS to GENERATED BY DEFAULT
> --------------------------------------------------------------------------------------
>
>                 Key: DERBY-6882
>                 URL: https://issues.apache.org/jira/browse/DERBY-6882
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 10.12.1.1
>            Reporter: Aleksei Kovura
>            Assignee: Rick Hillegas
>              Labels: features
>         Attachments: derby-6882-01-aa-initialCode.diff, derby-6882-01-bb-withTests.diff
>
>
> I'm trying to import data from another Derby database with foreignViews tool because
system tables got corrupted somehow (see https://issues.apache.org/jira/browse/DERBY-6876).
Tables contain generated ID columns (created as "GENERATED ALWAYS"). Importing data and allowing
Derby to generate new IDs in generated columns will break relationships between tables (old
tables have counter gaps there due to deletes - IDs won't match).
> For a clean import without breaking DDL information in DB version control I would like
to be able to switch between generated types as follows:
>  
> ALTER TABLE table1 ALTER COLUMN col1 SET GENERATED BY DEFAULT [ AS IDENTITY]
> ALTER TABLE table1 ALTER COLUMN col1 SET GENERATED ALWAYS [ AS IDENTITY]



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