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Bug#27590: Wrong DATE/DATETIME comparison.

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DATE and DATETIME can be compared either as strings or as int. Both
methods have their disadvantages. Strings can contain valid DATETIME value
but have insignificant zeros omitted thus became non-comparable with
other DATETIME strings. The comparison as int usually will require conversion
from the string representation and the automatic conversion in most cases is
carried out in a wrong way thus producing wrong comparison result. Another
problem occurs when one tries to compare DATE field with a DATETIME constant.
The constant is converted to DATE losing its precision i.e. losing time part.

This fix addresses the problems described above by adding a special
DATE/DATETIME comparator. The comparator correctly converts DATE/DATETIME
string values to int when it's necessary, adds zero time part (00:00:00)
to DATE values to compare them correctly to DATETIME values. Due to correct
conversion malformed DATETIME string values are correctly compared to other
DATE/DATETIME values.

As of this patch a DATE value equals to DATETIME value with zero time part.
For example '2001-01-01' equals to '2001-01-01 00:00:00'.

The compare_datetime() function is added to the Arg_comparator class.
It implements the correct comparator for DATE/DATETIME values.
Two supplementary functions called get_date_from_str() and get_datetime_value()
are added. The first one extracts DATE/DATETIME value from a string and the
second one retrieves the correct DATE/DATETIME value from an item.
The new Arg_comparator::can_compare_as_dates() function is added and used
to check whether two given items can be compared by the compare_datetime()
comparator.
Two caching variables were added to the Arg_comparator class to speedup the
DATE/DATETIME comparison.
One more store() method was added to the Item_cache_int class to cache int
values.
The new is_datetime() function was added to the Item class. It indicates
whether the item returns a DATE/DATETIME value.
This commit is contained in:
evgen@moonbone.local
2007-04-27 00:12:09 +04:00
parent 4aeb1c896e
commit 4747fa0c03
17 changed files with 517 additions and 40 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
mysql-test/include/ps_conv.inc
View File

@@ -1171,7 +1171,7 @@ execute stmt1 using @arg00, @arg00, @arg00, @arg00, @arg00 ;
######## SELECT .. WHERE column(date/time/..)=value(DATETIME/LONGBLOB) ########
set @arg00= CAST('1991-01-01 01:01:01' as datetime) ;
select 'true' as found from t9
where c1= 20 and c13= CAST('1991-01-01 01:01:01' as datetime) and
where c1= 20 and c13= CAST('1991-01-01 00:00:00' as datetime) and
c14= CAST('1991-01-01 01:01:01' as datetime) and
c15= CAST('1991-01-01 01:01:01' as datetime) and
c16= CAST('1991-01-01 01:01:01' as datetime) and
@@ -1180,7 +1180,7 @@ select 'true' as found from t9
where c1= 20 and c13= CAST(@arg00 AS DATE) and c14= @arg00 and c15= @arg00 and c16= @arg00
and c17= @arg00 ;
prepare stmt1 from "select 'true' as found from t9
where c1= 20 and c13= CAST('1991-01-01 01:01:01' as datetime) and
where c1= 20 and c13= CAST('1991-01-01 00:00:00' as datetime) and
c14= CAST('1991-01-01 01:01:01' as datetime) and
c15= CAST('1991-01-01 01:01:01' as datetime) and
c16= CAST('1991-01-01 01:01:01' as datetime) and

35
mysql-test/r/bdb_notembedded.result Normal file
View File

@@ -0,0 +1,35 @@
set autocommit=1;
reset master;
create table bug16206 (a int);
insert into bug16206 values(1);
start transaction;
insert into bug16206 values(2);
commit;
show binlog events;
Log_name Pos Event_type Server_id End_log_pos Info
f n Format_desc 1 n Server ver: VERSION, Binlog ver: 4
f n Query 1 n use `test`; create table bug16206 (a int)
f n Query 1 n use `test`; insert into bug16206 values(1)
f n Query 1 n use `test`; insert into bug16206 values(2)
drop table bug16206;
reset master;
create table bug16206 (a int) engine= bdb;
insert into bug16206 values(0);
insert into bug16206 values(1);
start transaction;
insert into bug16206 values(2);
commit;
insert into bug16206 values(3);
show binlog events;
Log_name Pos Event_type Server_id End_log_pos Info
f n Format_desc 1 n Server ver: VERSION, Binlog ver: 4
f n Query 1 n use `test`; create table bug16206 (a int) engine= bdb
f n Query 1 n use `test`; insert into bug16206 values(0)
f n Query 1 n use `test`; insert into bug16206 values(1)
f n Query 1 n use `test`; BEGIN
f n Query 1 n use `test`; insert into bug16206 values(2)
f n Query 1 n use `test`; COMMIT
f n Query 1 n use `test`; insert into bug16206 values(3)
drop table bug16206;
set autocommit=0;
End of 5.0 tests

2
mysql-test/r/distinct.result
View File

@@ -633,7 +633,7 @@ EXPLAIN SELECT (SELECT DISTINCT ADDDATE(a,1) FROM t1
WHERE ADDDATE(a,1) = '2002-08-03');
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL No tables used
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using where; Using temporary
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using where
CREATE TABLE t2 (a CHAR(5) CHARACTER SET latin1 COLLATE latin1_general_ci);
INSERT INTO t2 VALUES (0xf6);
INSERT INTO t2 VALUES ('oe');

4
mysql-test/r/ps_2myisam.result
View File

@@ -3070,7 +3070,7 @@ found
true
set @arg00= CAST('1991-01-01 01:01:01' as datetime) ;
select 'true' as found from t9
where c1= 20 and c13= CAST('1991-01-01 01:01:01' as datetime) and
where c1= 20 and c13= CAST('1991-01-01 00:00:00' as datetime) and
c14= CAST('1991-01-01 01:01:01' as datetime) and
c15= CAST('1991-01-01 01:01:01' as datetime) and
c16= CAST('1991-01-01 01:01:01' as datetime) and
@@ -3083,7 +3083,7 @@ and c17= @arg00 ;
found
true
prepare stmt1 from "select 'true' as found from t9
where c1= 20 and c13= CAST('1991-01-01 01:01:01' as datetime) and
where c1= 20 and c13= CAST('1991-01-01 00:00:00' as datetime) and
c14= CAST('1991-01-01 01:01:01' as datetime) and
c15= CAST('1991-01-01 01:01:01' as datetime) and
c16= CAST('1991-01-01 01:01:01' as datetime) and

4
mysql-test/r/ps_3innodb.result
View File

@@ -3053,7 +3053,7 @@ found
true
set @arg00= CAST('1991-01-01 01:01:01' as datetime) ;
select 'true' as found from t9
where c1= 20 and c13= CAST('1991-01-01 01:01:01' as datetime) and
where c1= 20 and c13= CAST('1991-01-01 00:00:00' as datetime) and
c14= CAST('1991-01-01 01:01:01' as datetime) and
c15= CAST('1991-01-01 01:01:01' as datetime) and
c16= CAST('1991-01-01 01:01:01' as datetime) and
@@ -3066,7 +3066,7 @@ and c17= @arg00 ;
found
true
prepare stmt1 from "select 'true' as found from t9
where c1= 20 and c13= CAST('1991-01-01 01:01:01' as datetime) and
where c1= 20 and c13= CAST('1991-01-01 00:00:00' as datetime) and
c14= CAST('1991-01-01 01:01:01' as datetime) and
c15= CAST('1991-01-01 01:01:01' as datetime) and
c16= CAST('1991-01-01 01:01:01' as datetime) and

4
mysql-test/r/ps_4heap.result
View File

@@ -3054,7 +3054,7 @@ found
true
set @arg00= CAST('1991-01-01 01:01:01' as datetime) ;
select 'true' as found from t9
where c1= 20 and c13= CAST('1991-01-01 01:01:01' as datetime) and
where c1= 20 and c13= CAST('1991-01-01 00:00:00' as datetime) and
c14= CAST('1991-01-01 01:01:01' as datetime) and
c15= CAST('1991-01-01 01:01:01' as datetime) and
c16= CAST('1991-01-01 01:01:01' as datetime) and
@@ -3067,7 +3067,7 @@ and c17= @arg00 ;
found
true
prepare stmt1 from "select 'true' as found from t9
where c1= 20 and c13= CAST('1991-01-01 01:01:01' as datetime) and
where c1= 20 and c13= CAST('1991-01-01 00:00:00' as datetime) and
c14= CAST('1991-01-01 01:01:01' as datetime) and
c15= CAST('1991-01-01 01:01:01' as datetime) and
c16= CAST('1991-01-01 01:01:01' as datetime) and

8
mysql-test/r/ps_5merge.result
View File

@@ -2990,7 +2990,7 @@ found
true
set @arg00= CAST('1991-01-01 01:01:01' as datetime) ;
select 'true' as found from t9
where c1= 20 and c13= CAST('1991-01-01 01:01:01' as datetime) and
where c1= 20 and c13= CAST('1991-01-01 00:00:00' as datetime) and
c14= CAST('1991-01-01 01:01:01' as datetime) and
c15= CAST('1991-01-01 01:01:01' as datetime) and
c16= CAST('1991-01-01 01:01:01' as datetime) and
@@ -3003,7 +3003,7 @@ and c17= @arg00 ;
found
true
prepare stmt1 from "select 'true' as found from t9
where c1= 20 and c13= CAST('1991-01-01 01:01:01' as datetime) and
where c1= 20 and c13= CAST('1991-01-01 00:00:00' as datetime) and
c14= CAST('1991-01-01 01:01:01' as datetime) and
c15= CAST('1991-01-01 01:01:01' as datetime) and
c16= CAST('1991-01-01 01:01:01' as datetime) and
@@ -6004,7 +6004,7 @@ found
true
set @arg00= CAST('1991-01-01 01:01:01' as datetime) ;
select 'true' as found from t9
where c1= 20 and c13= CAST('1991-01-01 01:01:01' as datetime) and
where c1= 20 and c13= CAST('1991-01-01 00:00:00' as datetime) and
c14= CAST('1991-01-01 01:01:01' as datetime) and
c15= CAST('1991-01-01 01:01:01' as datetime) and
c16= CAST('1991-01-01 01:01:01' as datetime) and
@@ -6017,7 +6017,7 @@ and c17= @arg00 ;
found
true
prepare stmt1 from "select 'true' as found from t9
where c1= 20 and c13= CAST('1991-01-01 01:01:01' as datetime) and
where c1= 20 and c13= CAST('1991-01-01 00:00:00' as datetime) and
c14= CAST('1991-01-01 01:01:01' as datetime) and
c15= CAST('1991-01-01 01:01:01' as datetime) and
c16= CAST('1991-01-01 01:01:01' as datetime) and

4
mysql-test/r/subselect.result
View File

@@ -394,13 +394,13 @@ EXPLAIN EXTENDED SELECT DISTINCT date FROM t1 WHERE date='2002-08-03';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL PRIMARY 43 NULL 2 Using where; Using index
Warnings:
Note 1003 select distinct `test`.`t1`.`date` AS `date` from `test`.`t1` where (`test`.`t1`.`date` = 20020803)
Note 1003 select distinct `test`.`t1`.`date` AS `date` from `test`.`t1` where (`test`.`t1`.`date` = _latin1'2002-08-03')
EXPLAIN EXTENDED SELECT (SELECT DISTINCT date FROM t1 WHERE date='2002-08-03');
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL No tables used
2 SUBQUERY t1 index NULL PRIMARY 43 NULL 2 Using where; Using index
Warnings:
Note 1003 select (select distinct `test`.`t1`.`date` AS `date` from `test`.`t1` where (`test`.`t1`.`date` = 20020803)) AS `(SELECT DISTINCT date FROM t1 WHERE date='2002-08-03')`
Note 1003 select (select distinct `test`.`t1`.`date` AS `date` from `test`.`t1` where (`test`.`t1`.`date` = _latin1'2002-08-03')) AS `(SELECT DISTINCT date FROM t1 WHERE date='2002-08-03')`
SELECT DISTINCT date FROM t1 WHERE date='2002-08-03';
date
2002-08-03

39
mysql-test/r/type_datetime.result
View File

@@ -192,3 +192,42 @@ CAST(CAST('2006-08-10 10:11:12' AS DATETIME) + INTERVAL 14 MICROSECOND AS DECIMA
SELECT CAST(CAST('10:11:12.098700' AS TIME) AS DECIMAL(20,6));
CAST(CAST('10:11:12.098700' AS TIME) AS DECIMAL(20,6))
101112.098700
create table t1 (f1 date, f2 datetime, f3 timestamp);
insert into t1(f1) values(curdate());
select curdate() < now(), f1 < now(), cast(f1 as date) < now() from t1;
curdate() < now() f1 < now() cast(f1 as date) < now()
1 1 1
delete from t1;
insert into t1 values('2001-01-01','2001-01-01 01:01:01','2001-01-01 01:01:01');
insert into t1 values('2001-02-05','2001-02-05 00:00:00','2001-02-05 01:01:01');
insert into t1 values('2001-03-10','2001-03-09 01:01:01','2001-03-10 01:01:01');
insert into t1 values('2001-04-15','2001-04-15 00:00:00','2001-04-15 00:00:00');
insert into t1 values('2001-05-20','2001-05-20 01:01:01','2001-05-20 01:01:01');
select f1, f3 from t1 where f1 >= '2001-02-05 00:00:00' and f3 <= '2001-04-15';
f1 f3
2001-02-05 2001-02-05 01:01:01
2001-03-10 2001-03-10 01:01:01
2001-04-15 2001-04-15 00:00:00
select f1, f3 from t1 where f1 >= '2001-2-5 0:0:0' and f2 <= '2001-4-15';
f1 f3
2001-02-05 2001-02-05 01:01:01
2001-03-10 2001-03-10 01:01:01
2001-04-15 2001-04-15 00:00:00
select f1, f2 from t1 where if(1, f1, 0) >= f2;
f1 f2
2001-02-05 2001-02-05 00:00:00
2001-03-10 2001-03-09 01:01:01
2001-04-15 2001-04-15 00:00:00
select 1 from dual where cast('2001-1-1 2:3:4' as date) = cast('2001-01-01' as datetime);
1
1
select f1, f2, UNIX_TIMESTAMP(f2), UNIX_TIMESTAMP(f1),
f1 > f2, f1 = f2, f1 < f2
from t1;
f1 f2 UNIX_TIMESTAMP(f2) UNIX_TIMESTAMP(f1) f1 > f2 f1 = f2 f1 < f2
2001-01-01 2001-01-01 01:01:01 978300061 978296400 0 0 1
2001-02-05 2001-02-05 00:00:00 981320400 981320400 0 1 0
2001-03-10 2001-03-09 01:01:01 984088861 984171600 1 0 0
2001-04-15 2001-04-15 00:00:00 987282000 987282000 0 1 0
2001-05-20 2001-05-20 01:01:01 990309661 990306000 0 0 1
drop table t1;

38
mysql-test/t/bdb_notembedded.test Normal file
View File

@@ -0,0 +1,38 @@
-- source include/not_embedded.inc
-- source include/have_bdb.inc
#
# Bug #16206: Superfluous COMMIT event in binlog when updating BDB in autocommit mode
#
set autocommit=1;
let $VERSION=`select version()`;
reset master;
create table bug16206 (a int);
insert into bug16206 values(1);
start transaction;
insert into bug16206 values(2);
commit;
--replace_result $VERSION VERSION
--replace_column 1 f 2 n 5 n
show binlog events;
drop table bug16206;
reset master;
create table bug16206 (a int) engine= bdb;
insert into bug16206 values(0);
insert into bug16206 values(1);
start transaction;
insert into bug16206 values(2);
commit;
insert into bug16206 values(3);
--replace_result $VERSION VERSION
--replace_column 1 f 2 n 5 n
show binlog events;
drop table bug16206;
set autocommit=0;
--echo End of 5.0 tests

20
mysql-test/t/type_datetime.test
View File

@@ -141,3 +141,23 @@ SELECT CAST(CAST('2006-08-10 10:11:12' AS DATETIME) AS DECIMAL(20,6));
SELECT CAST(CAST('2006-08-10 10:11:12' AS DATETIME) + INTERVAL 14 MICROSECOND AS DECIMAL(20,6));
SELECT CAST(CAST('10:11:12.098700' AS TIME) AS DECIMAL(20,6));
#
# Bug#27590: Wrong DATE/DATETIME comparison.
#
create table t1 (f1 date, f2 datetime, f3 timestamp);
insert into t1(f1) values(curdate());
select curdate() < now(), f1 < now(), cast(f1 as date) < now() from t1;
delete from t1;
insert into t1 values('2001-01-01','2001-01-01 01:01:01','2001-01-01 01:01:01');
insert into t1 values('2001-02-05','2001-02-05 00:00:00','2001-02-05 01:01:01');
insert into t1 values('2001-03-10','2001-03-09 01:01:01','2001-03-10 01:01:01');
insert into t1 values('2001-04-15','2001-04-15 00:00:00','2001-04-15 00:00:00');
insert into t1 values('2001-05-20','2001-05-20 01:01:01','2001-05-20 01:01:01');
select f1, f3 from t1 where f1 >= '2001-02-05 00:00:00' and f3 <= '2001-04-15';
select f1, f3 from t1 where f1 >= '2001-2-5 0:0:0' and f2 <= '2001-4-15';
select f1, f2 from t1 where if(1, f1, 0) >= f2;
select 1 from dual where cast('2001-1-1 2:3:4' as date) = cast('2001-01-01' as datetime);
select f1, f2, UNIX_TIMESTAMP(f2), UNIX_TIMESTAMP(f1),
f1 > f2, f1 = f2, f1 < f2
from t1;
drop table t1;