Bug #79353 IN operator works incorrectly with collate
Submitted: 20 Nov 2015 10:02 Modified: 20 Nov 2015 10:45
Reporter: Su Dylan Email Updates:
Status: Verified Impact on me:
None 
Category:MySQL Server: DML Severity:S2 (Serious)
Version:5.7.8, 5.6.29, 5.7.9 OS:Any
Assigned to: CPU Architecture:Any

[20 Nov 2015 10:02] Su Dylan
Description:
Output:
=======
mysql> set names utf8mb4;
Query OK, 0 rows affected (0.00 sec)

mysql> select (1, "a") in ((1, "b"), (1, "A" collate utf8mb4_bin)), (1, "a") in ((1, "A" collate utf8mb4_bin)),  (1, "a") in ((1, "b")) \G
*************************** 1. row ***************************
(1, "a") in ((1, "b"), (1, "A" collate utf8mb4_bin)): 1
          (1, "a") in ((1, "A" collate utf8mb4_bin)): 0
                              (1, "a") in ((1, "b")): 0
1 row in set (0.00 sec)

mysql> select version();
+-----------+
| version() |
+-----------+
| 5.7.8-rc  |
+-----------+
1 row in set (0.00 sec)

Problem:
========
"select (1, "a") in ((1, "b"), (1, "A" collate utf8mb4_bin))" should return 0.

How to repeat:
set names utf8mb4;
select (1, "a") in ((1, "b"), (1, "A" collate utf8mb4_bin)), (1, "a") in ((1, "A" collate utf8mb4_bin)),  (1, "a") in ((1, "b")) \G

Suggested fix:
"select (1, "a") in ((1, "b"), (1, "A" collate utf8mb4_bin))" should return 0.
[20 Nov 2015 10:45] MySQL Verification Team
Hello Su Dylan,

Thank you for the report and test case.
Verified as described with 5.6.29, 5.7.9 build.

Thanks,
Umesh
[20 Nov 2015 10:45] MySQL Verification Team
// 5.6.29

mysql> select version();
+---------------------------------------+
| version()                             |
+---------------------------------------+
| 5.6.29-enterprise-commercial-advanced |
+---------------------------------------+
1 row in set (0.00 sec)

mysql> select (1, "a") in ((1, "b"), (1, "A" collate utf8mb4_bin)), (1, "a") in ((1, "A" collate utf8mb4_bin)),  (1, "a") in ((1, "b")) \G
*************************** 1. row ***************************
(1, "a") in ((1, "b"), (1, "A" collate utf8mb4_bin)): 1
          (1, "a") in ((1, "A" collate utf8mb4_bin)): 0
                              (1, "a") in ((1, "b")): 0
1 row in set (0.00 sec)
[20 Nov 2015 10:46] MySQL Verification Team
// 5.7.9

[root@cluster-repo ~]# mysql -ubug -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 16
Server version: 5.7.9 MySQL Community Server (GPL)

Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

bug@localhost:(none)>select (1, "a") in ((1, "b"), (1, "A" collate utf8mb4_bin)), (1, "a") in ((1, "A" collate utf8mb4_bin)),  (1, "a") in ((1, "b")) \G
ERROR 1253 (42000): COLLATION 'utf8mb4_bin' is not valid for CHARACTER SET 'utf8'
bug@localhost:(none)>
bug@localhost:(none)>
bug@localhost:(none)>set names utf8mb4;
Query OK, 0 rows affected (0.00 sec)

bug@localhost:(none)>select (1, "a") in ((1, "b"), (1, "A" collate utf8mb4_bin)), (1, "a") in ((1, "A" collate utf8mb4_bin)),  (1, "a") in ((1, "b")) \G
*************************** 1. row ***************************
(1, "a") in ((1, "b"), (1, "A" collate utf8mb4_bin)): 1
          (1, "a") in ((1, "A" collate utf8mb4_bin)): 0
                              (1, "a") in ((1, "b")): 0