schematool failed on MySQL

CREATE TABLE IF NOT EXISTS `COLUMNS_V2` ( `CD_ID` bigint(20) NOT NULL, `COMMENT` varchar(256) CHARACTER SET latin1 COLLATE latin1_bin DEFAULT NULL, `COLUMN_NAME` varchar(1000) CHARACTER SET latin1 COLLATE latin1_bin NOT NULL, `TYPE_NAME` varchar(4000) DEFAULT NULL, `INTEGER_IDX` int(11) NOT NULL, PRIMARY KEY (`CD_ID`,`COLUMN_NAME`), KEY `COLUMNS_V2_N49` (`CD_ID`), CONSTRAINT `COLUMNS_V2_FK1` FOREIGN KEY (`CD_ID`) REFERENCES `CDS` (`CD_ID`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1
Error: Specified key was too long; max key length is 767 bytes (state=42000,code=1071)