该语句用于显示Backend上的存储格式信息（仅管理员使用）
语法：
    SHOW TABLET STORAGE FORMAT [VERBOSE]

```
MySQL [(none)]> show tablet storage format;
+-----------+---------+---------+
| BackendId | V1Count | V2Count |
+-----------+---------+---------+
| 10002     | 0       | 2867    |
+-----------+---------+---------+
1 row in set (0.003 sec)

MySQL [test_query_qa]> show tablet storage format verbose;
+-----------+----------+---------------+
| BackendId | TabletId | StorageFormat |
+-----------+----------+---------------+
| 10002     | 39227    | V2            |
| 10002     | 39221    | V2            |
| 10002     | 39215    | V2            |
| 10002     | 39199    | V2            |
+-----------+----------+---------------+
4 rows in set (0.034 sec)
```

SHOW, TABLET, STORAGE, FORMAT