Do not change diff when change schema column byte value

[nipe0324]

Step to reproduce

My environment:

• MySQL Server version: 5.7.29 Homebrew
• mysqldef v0.5.14

Step1. Create database

CREATE DATABASE IF NOT EXISTS `test01` DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_bin;

Step2. Initialize table

CREATE TABLE `items` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `name` varchar(255) COLLATE utf8mb4_bin DEFAULT NULL,
  `created_at` datetime NOT NULL,
  `updated_at` datetime NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin;

Step3. Write schema.sql file.

CREATE TABLE `items` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `name` varchar(1000) COLLATE utf8mb4_bin DEFAULT NULL, -- change varchar 255 to 1000
  `created_at` datetime NOT NULL,
  `updated_at` datetime NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin;

Step4. Do mysqldef as dry-run, but show Nothing is modified.

$ ./mysqldef -uroot --file=schema.sql --dry-run test01
-- Nothing is modified --

I guess that sqldef should show alter table as below.

ALTER TABLE items MODIFY `name` varchar(1000) COLLATE utf8mb4_bin DEFAULT NULL

[k0kubun]

Fixed the issue and started its release at v0.6.3.