DROP TABLE IF EXISTS t;
SET SESSION TOKUDB_DISABLE_SLOW_ALTER=ON;
SET SESSION DEFAULT_STORAGE_ENGINE='TokuDB';
CREATE TABLE t (a VARCHAR(32), b VARCHAR(32), KEY(a(2)));
SHOW CREATE TABLE t;
Table	Create Table
t	CREATE TABLE `t` (
  `a` varchar(32) DEFAULT NULL,
  `b` varchar(32) DEFAULT NULL,
  KEY `a` (`a`(2))
) ENGINE=TokuDB DEFAULT CHARSET=latin1
ALTER TABLE t CHANGE COLUMN a a VARCHAR(100);
ERROR 42000: Table 't' uses an extension that doesn't exist in this XYZ version
ALTER TABLE t CHANGE COLUMN a a VARCHAR(256);
ERROR 42000: Table 't' uses an extension that doesn't exist in this XYZ version
DROP TABLE t;