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https://issues.apache.org/jira/browse/DERBY-6882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15251868#comment-15251868
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ASF subversion and git services commented on DERBY-6882:
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Commit 1740299 from [~rhillegas] in branch 'code/branches/10.12'
[ https://svn.apache.org/r1740299 ]
DERBY-6882: Port 1738368 from main to the 10.12 branch.
> 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, derby-6882-02-aa-port_1738368_to_10.12.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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