Details
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Bug
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Status: Closed (View Workflow)
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Major
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Resolution: Won't Fix
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10.3.24, 10.2, 10.3, 10.4, 10.5
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CentOS Linux release 7.7.1908 (Core)
Description
We have confirmed that there is a problem with the collation process of utf8mb4_unicode_ci.
In general, we have seen that MariaDB manages the values of empty space('') and char(0) differently.
After that, as a result of performing the character set/collation change work, in utf8mb4_unicode_ci, the above acronyms were duplicated.
It was confirmed that a duplicate entry'' for key'PRIMARY' error occurred.
Please refer to the test results below.
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MariaDB [test]> status;
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--------------
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mysql Ver 15.1 Distrib 10.3.24-MariaDB, for Linux (x86_64) using readline 5.1
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Connection id: 766474
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Current database: test
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Current user: root@localhost
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SSL: Not in use
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Current pager: stdout
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Using outfile: ''
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Using delimiter: ;
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Server: MariaDB
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Server version: 10.3.24-MariaDB-log MariaDB Server
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Protocol version: 10
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Connection: Localhost via UNIX socket
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Server characterset: utf8mb4
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Db characterset: utf8mb4
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Client characterset: utf8mb4
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Conn. characterset: utf8mb4
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...
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MariaDB [test]> create table t1( c1 varchar(100) character set utf8 not null, nm varchar(100) , primary key(c1)) engine=innodb character set utf8;
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Query OK, 0 rows affected (0.176 sec)
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MariaDB [test]> insert into t1 values('','');
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Query OK, 1 row affected (0.074 sec)
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MariaDB [test]> insert into t1 values(char(0),'');
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Query OK, 1 row affected (0.088 sec)
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MariaDB [test]> select * from t1 where c1='';
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+----+------+
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| c1 | nm |
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+----+------+
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| | |
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+----+------+
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1 row in set (0.000 sec)
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MariaDB [test]> select * from t1 where c1=char(0);
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+----+------+
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| c1 | nm |
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+----+------+
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| | |
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+----+------+
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1 row in set (0.000 sec)
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MariaDB [test]> alter table t1 character set utf8mb4;
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Query OK, 0 rows affected (0.065 sec)
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Records: 0 Duplicates: 0 Warnings: 0
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MariaDB [test]>
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MariaDB [test]> alter table t1 modify c1 varchar(100) character set utf8mb4 collate utf8mb4_unicode_ci not null, modify nm varchar(100) character set utf8mb4 collate utf8mb4_unicode_ci ;
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ERROR 1062 (23000): Duplicate entry '' for key 'PRIMARY' <------------------------
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MariaDB [test]> alter table t1 modify c1 varchar(100) character set utf8mb4 collate utf8mb4_general_ci not null, modify nm varchar(100) character set utf8mb4 collate utf8mb4_general_ci ;
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Query OK, 2 rows affected (0.476 sec)
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Records: 2 Duplicates: 0 Warnings: 0
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MariaDB [test]> O.M.G.
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