mariadb/mysql-test/main/mysql_upgrade-20228.test

-- source include/mysql_upgrade_preparation.inc
-- source include/have_working_dns.inc
-- source include/have_innodb.inc
-- source include/have_partition.inc

if (!`SELECT count(*) FROM INFORMATION_SCHEMA.VIEWS
  WHERE TABLE_SCHEMA='mysql' AND TABLE_NAME='user'
  AND CHARACTER_SET_CLIENT='latin1'
  AND COLLATION_CONNECTION='latin1_swedish_ci'`)
{
  Skip Needs character_set_client=latin1 and collation_connection=latin1_swedish_ci in mysql.views;
}


--echo #
--echo # MDEV-20228 `mysql_upgrade` fails on every version upgrade: "ERROR 1267 (HY000) at line 7: Illegal mix of collations (utf8mb4_unicode_ci,COERCIBLE) and (utf8mb4_general_ci,COERCIBLE) for operation 'like'"
--echo #

let $MYSQLD_DATADIR= `select @@datadir`;

SET sql_mode="";
SET NAMES utf8mb4 COLLATE utf8mb4_unicode_ci;

--echo #
--echo # Changing character_set_client and collation_connection
--echo # for the VIEW mysql.user to utf8mb4/utf8mb4_unicode_ci,
--echo # to emulate that mysql.user was created by 'mysqld --bootstrap'
--echo # using mysqld compiled with
--echo # -DDEFAULT_CHARSET=utf8mb4 -DDEFAULT_COLLATION=utf8mb4_unicode_ci
--echo #

--disable_query_log
let $def= `SELECT VIEW_DEFINITION FROM INFORMATION_SCHEMA.VIEWS WHERE TABLE_SCHEMA='mysql' AND TABLE_NAME='user'`;
--eval ALTER VIEW mysql.user AS $def;
--enable_query_log

SELECT CHARACTER_SET_CLIENT, COLLATION_CONNECTION
FROM INFORMATION_SCHEMA.VIEWS
WHERE TABLE_SCHEMA='mysql' AND TABLE_NAME='user';

--echo # Running mysql_upgrade
--exec $MYSQL_UPGRADE --default-character-set=utf8mb4 --force 2>&1
--file_exists $MYSQLD_DATADIR/mariadb_upgrade_info
--remove_file $MYSQLD_DATADIR/mariadb_upgrade_info

--echo #
--echo # Restoring character_set_client and collation_connection back
--echo # so post-check returns the expected check-mysqld_1.result
--echo #

SET NAMES latin1;
--disable_query_log
let $def= `SELECT VIEW_DEFINITION FROM INFORMATION_SCHEMA.VIEWS WHERE TABLE_SCHEMA='mysql' AND TABLE_NAME='user'`;
--eval ALTER VIEW mysql.user AS $def;
--enable_query_log