MySql - Error Code: 1932. Table doesn't exist in engine - mysql

Question

I am getting the error below on a mysql restart after adding an enum field to my existing table. Locks table and only a complete database restore fixes issue as I can't drop the table either.
Error Code: 1932. Table 'users' doesn't exist in engine
My table and data is as follows:
CREATE TABLE `users` (
`id` char(36) NOT NULL,
`name` varchar(191) NOT NULL,
`email` varchar(191) NOT NULL,
`password` varchar(191) NOT NULL,
`created_at` timestamp NULL DEFAULT NULL,
`updated_at` timestamp NULL DEFAULT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `users_email_unique` (`email`)
);
INSERT INTO `users` VALUES
(
'11111111-1111-1111-1111-111111111111',
'John Doe',
'user#email.com',
'password',
NOW(),
NOW()
);
Table above works until line below is executed and mysql is restarted.
ALTER TABLE users ADD `role` enum('test1', 'test2') AFTER `password`
I have also done a diff on the table structure of a before and after. Only line with comment gets added and locks the table.
CREATE TABLE `users2` (
`id` char(36) COLLATE utf8mb4_unicode_ci NOT NULL,
`name` varchar(191) COLLATE utf8mb4_unicode_ci NOT NULL,
`email` varchar(191) COLLATE utf8mb4_unicode_ci NOT NULL,
`password` varchar(191) COLLATE utf8mb4_unicode_ci NOT NULL,
`role` enum('test1','test2') COLLATE utf8mb4_unicode_ci DEFAULT NULL, -- only diff
`created_at` timestamp NULL DEFAULT NULL,
`updated_at` timestamp NULL DEFAULT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `users1_email_unique` (`email`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
This is where it gets weird. Line below adds role to the end of the table and doesn't lock the table.
ALTER TABLE users ADD `role` enum('test1', 'test2'); -- AFTER `password`
Seems the AFTER is the issue. Doesn't matter if I try a different position.
Any suggestions would be appreciated.

Answer 1

You can also assign the default value while adding the column.
ALTER TABLE users ADD `role` enum('test1', 'test2') DEFAULT 'test1' AFTER `password`;
So, NULL values will not allow and all the rows will be assigned with 'test1'.