[
https://issues.apache.org/jira/browse/DERBY-6882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15229549#comment-15229549
]
Bryan Pendleton commented on DERBY-6882:
----------------------------------------
Hi Rick, thanks for working on this! Looks like a nice feature to me, too.
I eyeballed your patch and it seems quite clean. It would be nice if the
regression tests could verify the behavior against a pre-10.10 identity
column; I'm not sure how hard that would be.
As a (semi-)substantive comment, the error message text:
is not already an identity column
rang just a little bit odd in my ears. Would it read better if you omit
"already"?
> 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
>
>
> 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]
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
