Format create table sql error when encounter unique key with comment

[honganan]

CREATE TABLE `g_platform_payway` (
	`id` int(11) NOT NULL AUTO_INCREMENT COMMENT 'id', 
	`platform_code` varchar(45) NOT NULL, 
	`pay_way` varchar(32) NOT NULL, 
	PRIMARY KEY (`id`), 
	UNIQUE `uniq_playform_payway` USING BTREE (`platform_code`, `pay_way`) COMMENT 'should be unique'
) ENGINE = InnoDB CHARSET = utf8 COMMENT = 'config table'

when using the following code to format this above sql, error occured:

Statement statement = CCJSqlParserUtil.parse(sql3);

the error likes:

Exception in thread "main" net.sf.jsqlparser.JSQLParserException
	at net.sf.jsqlparser.parser.CCJSqlParserUtil.parse(CCJSqlParserUtil.java:54)
	at com.greenline.hati.biz.manager.common.SqlUtil.main(SqlUtil.java:118)
Caused by: net.sf.jsqlparser.parser.ParseException: Encountered " "USING" "USING "" at line 11, column 65.
Was expecting one of:
    "," ...
    ")" ...
    
	at net.sf.jsqlparser.parser.CCJSqlParser.generateParseException(CCJSqlParser.java:15112)
	at net.sf.jsqlparser.parser.CCJSqlParser.jj_consume_token(CCJSqlParser.java:14968)
	at net.sf.jsqlparser.parser.CCJSqlParser.CreateTable(CCJSqlParser.java:8232)

when I removed the USING BTREE COMMENT 'should be unique', the problem disappeared.