Incompatible Change: CHECK TABLE ... FOR UPGRADE did not check for collation changes made in MySQL 6.0.1 to latin2_czech_cs or collation changes made in MySQL 6.0.6 to big5_chinese_ci, cp866_general_ci, gb2312_chinese_ci, and gbk_chinese_ci. (This also affects mysqlcheck and mysql_upgrade, which cause that statement to be executed.) (Bug#40054)