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# ===== csv_alter_table.1 ===== DROP TABLE IF EXISTS t1; CREATE TABLE t1 (a int NOT NULL) ENGINE = CSV; ALTER TABLE t1 ADD COLUMN b CHAR(5) NOT NULL; DESC t1; Field Type Null Key Default Extra a int(11) NO NULL b char(5) NO NULL ALTER TABLE t1 DROP COLUMN b; DESC t1; Field Type Null Key Default Extra a int(11) NO NULL ALTER TABLE t1 MODIFY a BIGINT NOT NULL; DESC t1; Field Type Null Key Default Extra a bigint(20) NO NULL ALTER TABLE t1 CHANGE a a INT NOT NULL; DESC t1; Field Type Null Key Default Extra a int(11) NO NULL DROP TABLE t1; # ===== csv_alter_table.2 ===== DROP TABLE IF EXISTS t1; CREATE TABLE t1 (a int NOT NULL) ENGINE = CSV; ALTER TABLE t1 ADD COLUMN b CHAR(5); ERROR 42000: The storage engine for the table doesn't support nullable columns DESC t1; Field Type Null Key Default Extra a int(11) NO NULL ALTER TABLE t1 MODIFY a BIGINT; ERROR 42000: The storage engine for the table doesn't support nullable columns DESC t1; Field Type Null Key Default Extra a int(11) NO NULL ALTER TABLE t1 CHANGE a a INT; ERROR 42000: The storage engine for the table doesn't support nullable columns DESC t1; Field Type Null Key Default Extra a int(11) NO NULL DROP TABLE t1;