strongduanmu commented on issue #10567:
URL:
https://github.com/apache/shardingsphere/issues/10567#issuecomment-851748584
We should add `ShowIndexMergedResult` class to handle show index result
merge. The correct results should be as follows:
```
mysql> show index from t_single;
+----------+------------+----------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+---------+------------+
| Table | Non_unique | Key_name | Seq_in_index | Column_name |
Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment |
Index_comment | Visible | Expression |
+----------+------------+----------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+---------+------------+
| t_single | 0 | PRIMARY | 1 | order_id | A
| 0 | NULL | NULL | | BTREE | |
| YES | NULL |
| t_single | 1 | t_single_index | 1 | order_id | A
| 0 | NULL | NULL | | BTREE | |
| YES | NULL |
+----------+------------+----------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+---------+------------+
2 rows in set (17.07 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 |
| t_order | 1 | t_order_index | 1 | order_id | A
| 0 | NULL | NULL | | BTREE | |
| YES | NULL |
+---------+------------+---------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+---------+------------+
2 rows in set (9.63 sec)
```
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