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https://issues.apache.org/jira/browse/DERBY-6882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15252362#comment-15252362
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Aleksei Kovura commented on DERBY-6882:
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Some assistance would be nice actually. I tried checking out derby code:
mkdir derby ; svn co https://svn.apache.org/repos/asf/db/derby/code/trunk derby
... and switching to a revision you specified in the next post (r1740299):
svn up -r1740299
It builds successfully, but I end up with "10.13.0.0 alpha" version of jars in
jars/sane/. It's supposed to be some sort of 10.12.xx, right?
> 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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