azexcy commented on PR #27974:
URL: https://github.com/apache/shardingsphere/pull/27974#issuecomment-1668846140
```
mysql> CREATE TABLE t_order (order_id INT NOT NULL, user_id INT NOT NULL,
status VARCHAR(50), PRIMARY KEY (order_id))
mysql> describe t_order;
+----------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+----------+-------------+------+-----+---------+-------+
| order_id | int | NO | PRI | NULL | |
| user_id | int | NO | | NULL | |
| status | varchar(50) | YES | | NULL | |
+----------+-------------+------+-----+---------+-------+
3 rows in set (0.01 sec)
mysql> SHOW INDEX FROM t_order;
+---------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+---------+------------+
| Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation |
Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
Visible | Expression |
+---------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+---------+------------+
| t_order | 0 | PRIMARY | 1 | order_id | A |
0 | NULL | NULL | | BTREE | | |
YES | NULL |
+---------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+---------+------------+
1 row in set (0.01 sec)
```
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