MySQL+groonga / create table

mysql> show create table twitter_supistar \G;
*************************** 1. row ***************************
       Table: twitter_supistar
Create Table: CREATE TABLE `twitter_supistar` (
  `status_id` bigint(20) NOT NULL,
  `created_at` datetime DEFAULT NULL,
  `screen_name` varchar(32) DEFAULT NULL,
  `text` text,
  PRIMARY KEY (`status_id`),
  KEY `created_at` (`created_at`)
) ENGINE=groonga DEFAULT CHARSET=utf8
1 row in set (0.00 sec)

ERROR:
No query specified