AutoMigrate 迁移时间很久

[wleven]

GORM Playground Link

go-gorm/playground#1

Description

type User struct {
 PassWord string  `json:"passWord,omitempty" gorm:"size:32"` 
}

db.AutoMigrate(&User{})

2020/09/01 16:49:21 D:/zhiming/api/main.go:65
[1.049ms] [rows:0] select * from `users`

2020/09/01 16:50:22 D:/go/pkg/mod/gorm.io/driver/mysql@v1.0.1/migrator.go:30
[60089.026ms] [rows:0] ALTER TABLE `users` MODIFY COLUMN `pass_word` varchar(32)

表里有6000行数据
不指定PassWord 长度就很快，指定长度就很慢
这是正常的吗

[github-actions]

This issue has been automatically marked as stale as it missing playground pull request link, checkout https://github.com/go-gorm/playground for details, it will be closed in 2 days if no further activity occurs.

[jinzhu]

The altering SQL slow doesn't related to GORM...