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Fix for bug#49199: Optimizer handles incorrectly:

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field='const1' AND field='const2' in some cases

Building multiple equality predicates containing
a constant which is compared as a datetime (with a field)
we should take this fact into account and compare the 
constant with another possible constatns as datetimes 
as well.

E.g. for the
SELECT ... WHERE a='2001-01-01' AND a='2001-01-01 00:00:00'
we should compare '2001-01-01' with '2001-01-01 00:00:00' as
datetimes but not as strings.


mysql-test/r/select.result:
  Fix for bug#49199: Optimizer handles incorrectly: 
  field='const1' AND field='const2' in some cases
    - test result.
mysql-test/t/select.test:
  Fix for bug#49199: Optimizer handles incorrectly: 
  field='const1' AND field='const2' in some cases
    - test case.
sql/item_cmpfunc.cc:
  Fix for bug#49199: Optimizer handles incorrectly: 
  field='const1' AND field='const2' in some cases
    - adding a constant to Item_equal compare it as
  a datetime value with stored one if there's a 
  date[time] field in a equality predicate.
sql/item_cmpfunc.h:
  Fix for bug#49199: Optimizer handles incorrectly: 
  field='const1' AND field='const2' in some cases
    - adding a constant to Item_equal compare it as
  a datetime value with stored one if there's a 
  date[time] field in a equality predicate.
sql/sql_select.cc:
  Fix for bug#49199: Optimizer handles incorrectly: 
  field='const1' AND field='const2' in some cases
    - adding a constant to Item_equal compare it as
  a datetime value with stored one if there's a 
  date[time] field in a equality predicate.
This commit is contained in:
Ramil Kalimullin
2009-12-04 21:58:40 +04:00
parent 026541c662
commit f5b51bc1e2
5 changed files with 178 additions and 7 deletions
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84
mysql-test/r/select.result
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@ -4456,4 +4456,88 @@ SELECT 1 FROM t2 JOIN t1 ON 1=1
WHERE a != '1' AND NOT a >= b OR NOT ROW(b,a )<> ROW(a,a);
1
DROP TABLE t1,t2;
#
# Bug #49199: Optimizer handles incorrectly:
# field='const1' AND field='const2' in some cases
CREATE TABLE t1(a DATETIME NOT NULL);
INSERT INTO t1 VALUES('2001-01-01');
SELECT * FROM t1 WHERE a='2001-01-01' AND a='2001-01-01 00:00:00';
a
2001-01-01 00:00:00
EXPLAIN EXTENDED SELECT * FROM t1 WHERE a='2001-01-01' AND a='2001-01-01 00:00:00';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 system NULL NULL NULL NULL 1
Warnings:
Note 1003 select '2001-01-01 00:00:00' AS `a` from `test`.`t1` where 1
DROP TABLE t1;
CREATE TABLE t1(a DATE NOT NULL);
INSERT INTO t1 VALUES('2001-01-01');
SELECT * FROM t1 WHERE a='2001-01-01' AND a='2001-01-01 00:00:00';
a
2001-01-01
EXPLAIN EXTENDED SELECT * FROM t1 WHERE a='2001-01-01' AND a='2001-01-01 00:00:00';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 system NULL NULL NULL NULL 1
Warnings:
Note 1003 select '2001-01-01' AS `a` from `test`.`t1` where 1
DROP TABLE t1;
CREATE TABLE t1(a TIMESTAMP NOT NULL);
INSERT INTO t1 VALUES('2001-01-01');
SELECT * FROM t1 WHERE a='2001-01-01' AND a='2001-01-01 00:00:00';
a
2001-01-01 00:00:00
EXPLAIN EXTENDED SELECT * FROM t1 WHERE a='2001-01-01' AND a='2001-01-01 00:00:00';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 system NULL NULL NULL NULL 1
Warnings:
Note 1003 select '2001-01-01 00:00:00' AS `a` from `test`.`t1` where 1
DROP TABLE t1;
CREATE TABLE t1(a DATETIME NOT NULL, b DATE NOT NULL);
INSERT INTO t1 VALUES('2001-01-01', '2001-01-01');
SELECT * FROM t1 WHERE a='2001-01-01' AND a=b AND b='2001-01-01 00:00:00';
a b
2001-01-01 00:00:00 2001-01-01
EXPLAIN EXTENDED SELECT * FROM t1 WHERE a='2001-01-01' AND a=b AND b='2001-01-01 00:00:00';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 system NULL NULL NULL NULL 1
Warnings:
Note 1003 select '2001-01-01 00:00:00' AS `a`,'2001-01-01' AS `b` from `test`.`t1` where 1
DROP TABLE t1;
CREATE TABLE t1(a DATETIME NOT NULL, b VARCHAR(20) NOT NULL);
INSERT INTO t1 VALUES('2001-01-01', '2001-01-01');
SELECT * FROM t1 WHERE a='2001-01-01' AND a=b AND b='2001-01-01 00:00:00';
a b
EXPLAIN EXTENDED SELECT * FROM t1 WHERE a='2001-01-01' AND a=b AND b='2001-01-01 00:00:00';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
Warnings:
Note 1003 select '2001-01-01 00:00:00' AS `a`,'2001-01-01' AS `b` from `test`.`t1` where 0
SELECT * FROM t1 WHERE a='2001-01-01 00:00:00' AND a=b AND b='2001-01-01';
a b
2001-01-01 00:00:00 2001-01-01
EXPLAIN EXTENDED SELECT * FROM t1 WHERE a='2001-01-01 00:00:00' AND a=b AND b='2001-01-01';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 system NULL NULL NULL NULL 1
Warnings:
Note 1003 select '2001-01-01 00:00:00' AS `a`,'2001-01-01' AS `b` from `test`.`t1` where 1
DROP TABLE t1;
CREATE TABLE t1(a DATETIME NOT NULL, b DATE NOT NULL);
INSERT INTO t1 VALUES('2001-01-01', '2001-01-01');
SELECT x.a, y.a, z.a FROM t1 x
JOIN t1 y ON x.a=y.a
JOIN t1 z ON y.a=z.a
WHERE x.a='2001-01-01' AND z.a='2001-01-01 00:00:00';
a a a
2001-01-01 00:00:00 2001-01-01 00:00:00 2001-01-01 00:00:00
EXPLAIN EXTENDED SELECT x.a, y.a, z.a FROM t1 x
JOIN t1 y ON x.a=y.a
JOIN t1 z ON y.a=z.a
WHERE x.a='2001-01-01' AND z.a='2001-01-01 00:00:00';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE x system NULL NULL NULL NULL 1
1 SIMPLE y system NULL NULL NULL NULL 1
1 SIMPLE z system NULL NULL NULL NULL 1
Warnings:
Note 1003 select '2001-01-01 00:00:00' AS `a`,'2001-01-01 00:00:00' AS `a`,'2001-01-01 00:00:00' AS `a` from `test`.`t1` `x` join `test`.`t1` `y` join `test`.`t1` `z` where 1
End of 5.0 tests