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From horrockss@github in MariaDB docker GH issue 528, it was previously possible in 10.5.21 to add an auto_increment to a FK field under SET FOREIGN_KEY_CHECKS=0.
Since MDEV-31086, this is no longer possible to prevent index corruption. The AUTO_INCREMENT isn't something that can cause corruption however.
Test case:
MariaDB [test]> CREATE TABLE `device_type` (
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-> `id` int(10) unsigned NOT NULL,
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-> `name` varchar(128) DEFAULT NULL,
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-> PRIMARY KEY (`id`)
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-> ) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci;
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Query OK, 0 rows affected (0.009 sec)
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MariaDB [test]>
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MariaDB [test]> CREATE TABLE `device_field` (
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-> `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
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-> `name` varchar(128) DEFAULT NULL,
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-> `device_type_id` int(10) unsigned DEFAULT NULL,
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-> PRIMARY KEY (`id`),
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-> CONSTRAINT `FK_device_field_device_type` FOREIGN KEY (`device_type_id`) REFERENCES `device_type` (`id`)
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-> ) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci;
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Query OK, 0 rows affected (0.000 sec)
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MariaDB [test]>
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MariaDB [test]> SET FOREIGN_KEY_CHECKS=0;
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Query OK, 0 rows affected (0.000 sec)
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MariaDB [test]>
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MariaDB [test]> select @@foreign_key_checks;
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+----------------------+
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| @@foreign_key_checks |
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+----------------------+
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| 0 |
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+----------------------+
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1 row in set (0.000 sec)
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MariaDB [test]>
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MariaDB [test]> ALTER TABLE device_type MODIFY id INT unsigned AUTO_INCREMENT;
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ERROR 1833 (HY000): Cannot change column 'id': used in a foreign key constraint 'FK_device_field_device_type' of table 'test.device_field'
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Expected:
MariaDB [test]> CREATE TABLE `device_type` (
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-> `id` int(10) unsigned NOT NULL,
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-> `name` varchar(128) DEFAULT NULL,
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-> PRIMARY KEY (`id`)
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-> ) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci;
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Query OK, 0 rows affected (0.001 sec)
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MariaDB [test]>
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MariaDB [test]> CREATE TABLE `device_field` (
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-> `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
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-> `name` varchar(128) DEFAULT NULL,
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-> `device_type_id` int(10) unsigned DEFAULT NULL,
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-> PRIMARY KEY (`id`),
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-> CONSTRAINT `FK_device_field_device_type` FOREIGN KEY (`device_type_id`) REFERENCES `device_type` (`id`)
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-> ) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci;
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Query OK, 0 rows affected (0.001 sec)
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MariaDB [test]>
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MariaDB [test]> ALTER TABLE device_type MODIFY id INT unsigned AUTO_INCREMENT;
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Query OK, 0 rows affected (0.001 sec)
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Records: 0 Duplicates: 0 Warnings: 0
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To preserve the working setup we add this functionality that was previously available before the MDEV-31086 bug fix.
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