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c19972fc87
while according to Storage Engine API column names should be compared case insensitively. This can cause FRM and InnoDB data dictionary to go out of sync.
40 lines
1.4 KiB
Text
40 lines
1.4 KiB
Text
CREATE TABLE t1 (D INT) ENGINE=innodb;
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INSERT INTO t1 VALUES (10);
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ALTER TABLE t1 MODIFY COLUMN d INT;
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ALTER TABLE t1 ADD INDEX my_d (d);
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SHOW CREATE TABLE t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`d` int(11) DEFAULT NULL,
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KEY `my_d` (`d`)
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) ENGINE=InnoDB DEFAULT CHARSET=latin1
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INSERT INTO t1 VALUES (1),(2),(3),(4),(5),(6),(7),(8),(9);
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INSERT INTO t1 SELECT * FROM t1;
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INSERT INTO t1 SELECT * FROM t1;
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INSERT INTO t1 SELECT * FROM t1;
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INSERT INTO t1 SELECT * FROM t1;
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INSERT INTO t1 SELECT * FROM t1;
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INSERT INTO t1 SELECT * FROM t1;
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INSERT INTO t1 SELECT * FROM t1;
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EXPLAIN SELECT d FROM t1 WHERE d = 5;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref my_d my_d 5 const 128 Using index
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EXPLAIN SELECT D FROM t1 WHERE D = 5;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref my_d my_d 5 const 128 Using index
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ALTER TABLE t1 DROP INDEX my_d;
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ALTER TABLE t1 MODIFY COLUMN D INT;
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ALTER TABLE t1 ADD INDEX my_d (D);
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EXPLAIN SELECT d FROM t1 WHERE d = 5;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref my_d my_d 5 const 128 Using index
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EXPLAIN SELECT D FROM t1 WHERE D = 5;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref my_d my_d 5 const 128 Using index
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SHOW CREATE TABLE t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`D` int(11) DEFAULT NULL,
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KEY `my_d` (`D`)
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) ENGINE=InnoDB DEFAULT CHARSET=latin1
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DROP TABLE t1;
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