Wrong ENUM value is updated to and seems it's mixed up with ENUM index #56832
Description
Bug Report
Please answer these questions before submitting your issue. Thanks!
1. Minimal reproduce step (Required)
mysql> create table t (id int primary key, c enum('0', '1', '2'));
Query OK, 0 rows affected (0.00 sec)
mysql> insert into t values (0,'0'), (1,'1'), (2,'2');
Query OK, 3 rows affected (0.01 sec)
Records: 3 Duplicates: 0 Warnings: 0
mysql> update t set c = 2 where id = 0;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> select * from t;
+----+------+
| id | c |
+----+------+
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
+----+------+
3 rows in set (0.00 sec)
mysql> select version();
+-----------+
| version() |
+-----------+
| 8.0.27 |
+-----------+
1 row in set (0.00 sec)
2. What did you expect to see? (Required)
as above
3. What did you see instead (Required)
mysql> create table t (id int primary key, c enum('0', '1', '2'));
Query OK, 0 rows affected (0.04 sec)
mysql> insert into t values (0,'0'), (1,'1'), (2,'2');
Query OK, 3 rows affected (0.00 sec)
Records: 3 Duplicates: 0 Warnings: 0
mysql> update t set c = 2 where id = 0;
Query OK, 1 row affected (0.01 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> select * from t;
+----+------+
| id | c |
+----+------+
| 0 | 2 |
| 1 | 1 |
| 2 | 2 |
+----+------+
3 rows in set (0.01 sec)
mysql> select version();
+-----------------------------------------+
| version() |
+-----------------------------------------+
| 8.0.11-TiDB-v8.4.0-alpha-25-gb02581a7a4 |
+-----------------------------------------+
1 row in set (0.01 sec)
in the last SELECT, the first row is different from MySQL
4. What is your TiDB version? (Required)
Release Version: v8.4.0-alpha-25-gb02581a7a4
Edition: Community
Git Commit Hash: b02581a7a47e98b49901c025767d175ee63fbf23
Git Branch: HEAD
UTC Build Time: 2024-08-23 03:07:52
GoVersion: go1.21.10
Race Enabled: false
Check Table Before Drop: false
Store: tikv