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branches/5.1: Fix bug#29507 TRUNCATE shows to many rows effected

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In InnoDB, the row count is only a rough estimate used by SQL
optimization. InnoDB is now return row count 0 for TRUNCATE operation.
This commit is contained in:
calvin 2008-04-24 11:25:30 +00:00
parent 0b9ab341a8
commit 6ac1930117
3 changed files with 33 additions and 0 deletions
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7
handler/ha_innodb.cc
View file

@ -5782,6 +5782,13 @@ ha_innobase::info(
n_rows++;
}
/* Fix bug#29507: TRUNCATE shows too many rows affected.
Do not show the estimates for TRUNCATE command. */
if (thd_sql_command(user_thd) == SQLCOM_TRUNCATE) {
n_rows = 0;
}
stats.records = (ha_rows)n_rows;
stats.deleted = 0;
stats.data_file_length = ((ulonglong)

11
mysql-test/innodb.result
View file

@ -3264,3 +3264,14 @@ AUTO_INCREMENT
200
DROP TABLE t2;
DROP TABLE t1;
CREATE TABLE t1 (c1 int default NULL,
c2 int default NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
TRUNCATE TABLE t1;
affected rows: 0
INSERT INTO t1 VALUES (1, 1), (2, 2), (3, 3), (4, 4), (5, 5);
affected rows: 5
info: Records: 5 Duplicates: 0 Warnings: 0
TRUNCATE TABLE t1;
affected rows: 0
DROP TABLE t1;

15
mysql-test/innodb.test
View file

@ -2458,7 +2458,22 @@ SELECT AUTO_INCREMENT FROM INFORMATION_SCHEMA.TABLES WHERE table_name = 't2';
DROP TABLE t2;
DROP TABLE t1;
# End 34920 test
# Bug #29507 TRUNCATE shows to many rows effected
#
CONNECTION default;
CREATE TABLE t1 (c1 int default NULL,
c2 int default NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
--enable_info
TRUNCATE TABLE t1;
INSERT INTO t1 VALUES (1, 1), (2, 2), (3, 3), (4, 4), (5, 5);
TRUNCATE TABLE t1;
--disable_info
DROP TABLE t1;
#
#######################################################################
# #
# Please, DO NOT TOUCH this file as well as the innodb.result file. #