Bug #2925 LIKE "string%" does not work correctly on VARHCAR with partial index in MERGE t

• Submitted: 23 Feb 2004 9:08
• Modified: 23 Feb 2004 10:27
• Reporter: SINISA MILIVOJEVIC
• Status: Not a Bug
• Category: MySQL Server
• Severity: S2 (Serious)
• Version: 4.0.18
• OS: Any (any)
• Assigned to: Sergei Golubchik
• CPU Architecture: Any

[23 Feb 2004 9:08] SINISA MILIVOJEVIC

Description:
Queries which contain LIKE "string%" in the WHERE clause do not work correctly on VARHCAR with partial index in MERGE tables.

How to repeat:

mysql> create table t1 (c varchar(192), key cc (c(10)));
Query OK, 0 rows affected (0.01 sec)

mysql> create table t2 (c varchar(192), key cc (c(10)));
Query OK, 0 rows affected (0.01 sec)

mysql> insert into t2 values ("[e-mail]");
Query OK, 1 row affected (0.02 sec)

mysql> insert into t1 values ("sinisa@mysqlcom");
Query OK, 1 row affected (0.00 sec)

mysql> create table t (c char(192), key cc (c(10))) type=mrg_myisam union=(t1,t2);
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> select * from t where c like "sinisa%";
Empty set (0.00 sec)

mysql> select * from t1 where c like "sinisa%";
+----------------------+
| c                    |
+----------------------+
| [e-mail]     |
+----------------------+
1 row in set (0.00 sec)

mysql> select * from t2 where c like "sinisa%";
+----------------------+
| c                    |
+----------------------+
| [e-mail]     |
+----------------------+
1 row in set (0.00 sec)

mysql> select * from t where c like "sinisa%";
Empty set (0.00 sec)

[23 Feb 2004 10:27] Sergei Golubchik

Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.mysql.com/documentation/ and the instructions on
how to report a bug at http://bugs.mysql.com/how-to-report.php

Additional info:

MERGE table should have the same structure as underlying MyISAM tables.
You have declared a column as CHAR in MERGE table and VARCHAR in MyISAM tables.