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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
Download Patch File Download Diff File Expand all files Collapse all files

49
mysql-test/t/select.test
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@ -3797,4 +3797,53 @@ SELECT 1 FROM t2 JOIN t1 ON 1=1
DROP TABLE t1,t2;
--echo #
--echo # Bug #49199: Optimizer handles incorrectly:
--echo # field='const1' AND field='const2' in some cases
--echo
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';
EXPLAIN EXTENDED SELECT * FROM t1 WHERE a='2001-01-01' AND a='2001-01-01 00:00:00';
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';
EXPLAIN EXTENDED SELECT * FROM t1 WHERE a='2001-01-01' AND a='2001-01-01 00:00:00';
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';
EXPLAIN EXTENDED SELECT * FROM t1 WHERE a='2001-01-01' AND a='2001-01-01 00:00:00';
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';
EXPLAIN EXTENDED SELECT * FROM t1 WHERE a='2001-01-01' AND a=b AND b='2001-01-01 00:00:00';
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';
EXPLAIN EXTENDED SELECT * FROM t1 WHERE a='2001-01-01' AND a=b AND b='2001-01-01 00:00:00';
SELECT * FROM t1 WHERE a='2001-01-01 00:00:00' AND a=b AND b='2001-01-01';
EXPLAIN EXTENDED SELECT * FROM t1 WHERE a='2001-01-01 00:00:00' AND a=b AND b='2001-01-01';
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';
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';
--echo End of 5.0 tests