From 96247981d8f0a31fdd607b2c8db87d9e48993eeb Mon Sep 17 00:00:00 2001
From: Yingchu Chen <yingchu.chen@merico.dev>
Date: Mon, 9 May 2022 12:34:47 +0800
Subject: [PATCH] add USING ?::? to `AlterColumn`

---
 migrator.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/migrator.go b/migrator.go
index e2eb9ee..725f9fe 100644
--- a/migrator.go
+++ b/migrator.go
@@ -267,7 +267,8 @@ func (m Migrator) AlterColumn(value interface{}, field string) error {
 							return err
 						}
 					} else {
-						if err := tx.Exec("ALTER TABLE ? ALTER COLUMN ? TYPE ?", m.CurrentTable(stmt), clause.Column{Name: field.DBName}, fileType).Error; err != nil {
+						if err := tx.Exec("ALTER TABLE ? ALTER COLUMN ? TYPE ? USING ?::?",
+							m.CurrentTable(stmt), clause.Column{Name: field.DBName}, fileType, clause.Column{Name: field.DBName}, fileType).Error; err != nil {
 							return err
 						}
 					}