Aleksei Kovura created DERBY-6882:
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Summary: 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
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 ALTER COLUMN col1 SET GENERATED BY DEFAULT
ALTER TABLE ALTER COLUMN col1 SET GENERATED ALWAYS
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