gh-ost --version
1.1.4

gh-ost --user="$USER" --password="$DB_PASSWORD" --host="$HOST" \
--database="$DATABASE" --table="$TABLE" --alter="ADD INDEX user_registration (user_registration)" \
--allow-on-master --exact-rowcount --verbose --debug --stack --execute

2022-03-29 11:44:57 ERROR Error 1366: Incorrect string value: '\xEF\xBF\xBD\xC3\x90\xC2...' for column 'user_name' at row 1; query=
                        replace /* gh-ost `$DATABASE`.`_user_gho` */ into
                                `test`.`_user_gho`
                                        (`**redacted**`)
                                values
                                        (**redacted**)
                ; **redacted**
goroutine 70 [running]:
runtime/debug.Stack()
        /usr/local/Cellar/go/1.17.5/libexec/src/runtime/debug/stack.go:24 +0x65
runtime/debug.PrintStack()
        /usr/local/Cellar/go/1.17.5/libexec/src/runtime/debug/stack.go:16 +0x19
github.com/github/gh-ost/vendor/github.com/outbrain/golib/log.logErrorEntry(0xc0002afa40, {0x7e5660, 0xc0002afa40})
        /Users/dm-2/git/gh-ost/.gopath/src/github.com/github/gh-ost/vendor/github.com/outbrain/golib/log/log.go:178 +0x98
github.com/github/gh-ost/vendor/github.com/outbrain/golib/log.Errore(...)
        /Users/dm-2/git/gh-ost/.gopath/src/github.com/github/gh-ost/vendor/github.com/outbrain/golib/log/log.go:224
github.com/github/gh-ost/go/base.(*simpleLogger).Errore(0xc0000aa000, {0x7e5660, 0xc0002afa40})
        /Users/dm-2/git/gh-ost/.gopath/src/github.com/github/gh-ost/go/base/default_logger.go:50 +0x28
github.com/github/gh-ost/go/logic.(*Migrator).onApplyEventStruct(0xc0000aa000, 0x0)
        /Users/dm-2/git/gh-ost/.gopath/src/github.com/github/gh-ost/go/logic/migrator.go:1239 +0x2fd
github.com/github/gh-ost/go/logic.(*Migrator).executeWriteFuncs(0xc0000aa000)
        /Users/dm-2/git/gh-ost/.gopath/src/github.com/github/gh-ost/go/logic/migrator.go:1272 +0xb8
created by github.com/github/gh-ost/go/logic.(*Migrator).Migrate
        /Users/dm-2/git/gh-ost/.gopath/src/github.com/github/gh-ost/go/logic/migrator.go:410 +0x625

show create table $DATABASE.user;
CREATE TABLE `user` (
  `user_id` int unsigned NOT NULL AUTO_INCREMENT,
  `user_name` varchar(255) CHARACTER SET latin1 COLLATE latin1_bin NOT NULL DEFAULT '',
  `user_registration` varchar(16) DEFAULT NULL,
**redacted**,
  `user_name_normalized` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci GENERATED ALWAYS AS (convert(cast(convert(`user_name` using latin1) as char charset binary) using utf8mb4)) STORED,
  PRIMARY KEY (`user_id`),
  UNIQUE KEY `user_name` (`user_name`),
  KEY `user_name_normalized_idx` (`user_name_normalized`)
) ENGINE=InnoDB AUTO_INCREMENT=**redacted** DEFAULT CHARSET=latin1

CREATE TABLE `_user_gho` (
  `user_id` int unsigned NOT NULL AUTO_INCREMENT,
  `user_name` varchar(255) CHARACTER SET latin1 COLLATE latin1_bin NOT NULL DEFAULT '',
  `user_registration` varchar(16) DEFAULT NULL,
**redacted**,
  `user_name_normalized` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci GENERATED ALWAYS AS (convert(cast(convert(`user_name` using latin1) as char charset binary) using utf8mb4)) STORED,
  PRIMARY KEY (`user_id`),
  UNIQUE KEY `user_name` (`user_name`),
  KEY `user_name_normalized_idx` (`user_name_normalized`),
  KEY `user_registration` (`user_registration`)
) ENGINE=InnoDB AUTO_INCREMENT=**redacted** DEFAULT CHARSET=latin1