Mycat如何建立二级索引？

//建立分片表
CREATE TABLE db1.`travelrecord` (
  `id` bigint NOT NULL AUTO_INCREMENT,
  `user_id` varchar(100) DEFAULT NULL,
  `traveldate` date DEFAULT NULL,
  `fee` decimal(10,0) DEFAULT NULL,
  `days` int DEFAULT NULL,
  `blob` longblob,
  PRIMARY KEY (`id`),
  KEY `id` (`id`)
) ENGINE=InnoDB  DEFAULT CHARSET=utf8 dbpartition by mod_hash(id) tbpartition by mod_hash(id) tbpartitions 2 dbpartitions 2;
//建立全局二级索引
 CREATE UNIQUE GLOBAL INDEX `g_i_user_id` ON `db1`.`travelrecord`(`user_id`) 
    COVERING(`fee`,id) 
    dbpartition by mod_hash(`user_id`) tbpartition by mod_hash(`user_id`) dbpartitions 2 tbpartitions 2

CREATE TABLE IF NOT EXISTS db1.`travelrecord` (
	`id` bigint NOT NULL AUTO_INCREMENT,
	`user_id` varchar(100) DEFAULT NULL,
	`traveldate` date DEFAULT NULL,
	`fee` decimal(10, 0) DEFAULT NULL,
	`days` int DEFAULT NULL,
	`blob` longblob,
	PRIMARY KEY (`id`),
	KEY `id` (`id`),
	GLOBAL INDEX `g_i_user_id`(`user_id`) COVERING (`fee`, id) DBPARTITION BY mod_hash(`user_id`) TBPARTITION BY mod_hash(`user_id`) DBPARTITIONS 2 TBPARTITIONS 2
) ENGINE = InnoDB CHARSET = utf8
DBPARTITION BY mod_hash(id) DBPARTITIONS 2
TBPARTITION BY mod_hash(id) TBPARTITIONS 2