SET STATEMENT character_set_client, character_set_connection, character_set_filesystem have no effect

[Elena Stepanova]

MySQL [test]> set names utf8;
Query OK, 0 rows affected (0.00 sec)

MySQL [test]> select 'фи';
+------+
| фи |
+------+
| фи |
+------+
1 row in set (0.00 sec)

MySQL [test]> set statement character_set_client = latin5 for select 'фи';
+------+
| фи |
+------+
| фи |
+------+
1 row in set (0.00 sec)

# Compare with:

MySQL [test]> set character_set_client = latin5;
Query OK, 0 rows affected (0.00 sec)

MySQL [test]> select 'фи';
+----------+
| фи |
+----------+
| фи |
+----------+
1 row in set (0.00 sec)

#---------------------------------------------------------------

MySQL [test]> set names utf8;
Query OK, 0 rows affected (0.00 sec)

MySQL [test]> select 'фи';
+------+
| фи |
+------+
| фи |
+------+
1 row in set (0.01 sec)

MySQL [test]> set statement CHARACTER_SET_CONNECTION = latin5 for select 'фи';
+------+
| фи |
+------+
| фи |
+------+
1 row in set (0.00 sec)

# Compare with:

MySQL [test]> set character_set_connection = latin5;
Query OK, 0 rows affected (0.00 sec)

MySQL [test]> select 'фи';
+----+
| ?? |
+----+
| ?? |
+----+
1 row in set (0.00 sec)

#---------------------------------------------------------------

MySQL [test]> set names utf8;
Query OK, 0 rows affected (0.00 sec)

MySQL [test]> system touch 'файл';
MySQL [test]> create table tmp (i int);
Query OK, 0 rows affected (0.64 sec)

MySQL [test]> set statement CHARACTER_SET_FILESYSTEM = latin5 for load data local infile 'файл' into table tmp;
Query OK, 0 rows affected (0.00 sec)
Records: 0 Deleted: 0 Skipped: 0 Warnings: 0

# Compare with:

MySQL [test]> set character_set_filesystem = latin5;
Query OK, 0 rows affected (0.00 sec)

MySQL [test]> load data local infile 'файл' into table tmp;
ERROR 2 (HY000): File '????' not found (Errcode: 2)

[Valerii Kravchuk (valerii-kravchuk)]

This is easy to confirm:

[openxs@centos ~]$ mysql -uroot test
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.6.21-70.0 Percona Server (GPL), Release 70.0, Revision 688

Copyright (c) 2009-2014 Percona LLC and/or its affiliates
Copyright (c) 2000, 2014, 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.

mysql> set names utf8;
Query OK, 0 rows affected (0.00 sec)

mysql> select 'фи';
+------+
| фи |
+------+
| фи |
+------+
1 row in set (0.00 sec)

mysql> set statement character_set_client = latin5 for select 'фи';
+------+
| фи |
+------+
| фи |
+------+
1 row in set (0.00 sec)

mysql> set character_set_client = latin5;
Query OK, 0 rows affected (0.00 sec)

mysql> select 'фи';
+----------+
| �и |
+----------+
| �и |
+----------+
1 row in set (0.00 sec)

[Valerii Kravchuk (valerii-kravchuk)]

This is easy to confirm:

[openxs@centos ~]$ mysql -uroot test
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.6.21-70.0 Percona Server (GPL), Release 70.0, Revision 688

Copyright (c) 2009-2014 Percona LLC and/or its affiliates
Copyright (c) 2000, 2014, 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.

mysql> set names utf8;
Query OK, 0 rows affected (0.00 sec)

mysql> select 'фи';
+------+
| фи |
+------+
| фи |
+------+
1 row in set (0.00 sec)

mysql> set statement character_set_client = latin5 for select 'фи';
+------+
| фи |
+------+
| фи |
+------+
1 row in set (0.00 sec)

mysql> set character_set_client = latin5;
Query OK, 0 rows affected (0.00 sec)

mysql> select 'фи';
+----------+
| �и |
+----------+
| �и |
+----------+
1 row in set (0.00 sec)

[Elena Stepanova (elenst)]

I'm going to reduce entropy and put all charset-related stuff here.

Same for COLLATION_CONNECTION:

MySQL [test]> set names utf8;
Query OK, 0 rows affected (0.00 sec)

MySQL [test]> set statement collation_connection = utf8_bin for select 'a' union select 'b' union select 'A' order by 1;
+---+
| a |
+---+
| a |
| b |
+---+
2 rows in set (0.10 sec)

MySQL [test]> set collation_connection = utf8_bin;
Query OK, 0 rows affected (0.00 sec)

MySQL [test]> select 'a' union select 'b' union select 'A' order by 1;
+---+
| a |
+---+
| A |
| a |
| b |
+---+
3 rows in set (0.00 sec)

[Shahriyar Rzayev (rzayev-sehriyar)]

Percona now uses JIRA for bug reports so this bug report is migrated to: https://jira.percona.com/browse/PS-1577