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Fix for bug#50946: fast index creation still seems to copy the table

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Problem: ALTER TABLE ADD INDEX may lead to table copying if there's
numeric field(s) with non-default display width modificator specified.

Fix: compare numeric field's storage lenghts when we decide whether 
they can be considered 'equal' for table alteration purposes.
This commit is contained in:
Ramil Kalimullin
2010-04-25 15:06:40 +04:00
parent 9ea5576662
commit 4a1a64ec53
4 changed files with 55 additions and 3 deletions
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23
mysql-test/r/error_simulation.result
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@ -18,3 +18,26 @@ SELECT MAX(a) FROM t1 GROUP BY a,b;
ERROR 23000: Can't write; duplicate key in table 'tmp_table'
set tmp_table_size=default;
DROP TABLE t1;
#
# Bug #50946: fast index creation still seems to copy the table
#
CREATE TABLE t1 (a INT(100) NOT NULL);
INSERT INTO t1 VALUES (1), (0), (2);
SET SESSION debug='+d,alter_table_only_index_change';
ALTER TABLE t1 ADD INDEX a(a);
SET SESSION debug=DEFAULT;
SHOW CREATE TABLE t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` int(100) NOT NULL,
KEY `a` (`a`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
SELECT * FROM t1;
a
0
1
2
DROP TABLE t1;
#
# End of 5.1 tests
#