call mtr.add_suppression('InnoDB: Cannot add field.*because after adding it, the row size is'); SET GLOBAL innodb_file_per_table=on; SET GLOBAL innodb_strict_mode=on; set old_alter_table=0; CREATE TABLE bug53591(a text charset utf8 not null) ENGINE=InnoDB KEY_BLOCK_SIZE=1; ALTER TABLE bug53591 ADD PRIMARY KEY(a(220)); ERROR 42000: Row size too large. The maximum row size for the used table type, not counting BLOBs, is {checked_valid}. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs SHOW WARNINGS; Level Code Message Error 1118 Row size too large. The maximum row size for the used table type, not counting BLOBs, is {checked_valid}. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs DROP TABLE bug53591; SET GLOBAL innodb_file_per_table=1; SET GLOBAL innodb_strict_mode=DEFAULT;