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Bug #49910: Behavioural change in SELECT/WHERE on YEAR(4) data type

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(Original patch by Sinisa Milivojevic)

The YEAR(4) value of 2000 was equal to the "bad" YEAR(4) value of 0000.                              

The get_year_value() function has been modified to not adjust bad                                    
YEAR(4) value to 2000.


mysql-test/r/type_year.result:
  Test case for bug #49910.
mysql-test/t/type_year.test:
  Test case for bug #49910.
sql/item_cmpfunc.cc:
  Bug #49910: Behavioural change in SELECT/WHERE on YEAR(4) data type                                  
  
  The get_year_value() function has been modified to not adjust bad                                    
  YEAR(4) value to 2000.
This commit is contained in:
Gleb Shchepa 2010-03-22 12:33:25 +04:00
parent e66128972d
commit 8feadddbe4
3 changed files with 62 additions and 5 deletions
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32
mysql-test/r/type_year.result
View file

@ -309,4 +309,36 @@ yyyy c4
2069 2069
DROP TABLE t2, t4;
#
# Bug #49910: Behavioural change in SELECT/WHERE on YEAR(4) data type
#
CREATE TABLE t1 (y YEAR NOT NULL, s VARCHAR(4));
INSERT INTO t1 (s) VALUES ('bad');
Warnings:
Warning 1364 Field 'y' doesn't have a default value
INSERT INTO t1 (y, s) VALUES (0, 0), (2000, 2000), (2001, 2001);
SELECT * FROM t1 ta, t1 tb WHERE ta.y = tb.y;
y s y s
0000 bad 0000 bad
0000 0 0000 bad
0000 bad 0000 0
0000 0 0000 0
2000 2000 2000 2000
2001 2001 2001 2001
SELECT * FROM t1 WHERE t1.y = 0;
y s
0000 bad
0000 0
SELECT * FROM t1 WHERE t1.y = 2000;
y s
2000 2000
SELECT ta.y AS ta_y, ta.s, tb.y AS tb_y, tb.s FROM t1 ta, t1 tb HAVING ta_y = tb_y;
ta_y s tb_y s
0000 bad 0000 bad
0000 0 0000 bad
0000 bad 0000 0
0000 0 0000 0
2000 2000 2000 2000
2001 2001 2001 2001
DROP TABLE t1;
#
End of 5.1 tests

16
mysql-test/t/type_year.test
View file

@ -133,6 +133,22 @@ SELECT * FROM t4 WHERE yyyy > 123;
DROP TABLE t2, t4;
--echo #
--echo # Bug #49910: Behavioural change in SELECT/WHERE on YEAR(4) data type
--echo #
CREATE TABLE t1 (y YEAR NOT NULL, s VARCHAR(4));
INSERT INTO t1 (s) VALUES ('bad');
INSERT INTO t1 (y, s) VALUES (0, 0), (2000, 2000), (2001, 2001);
SELECT * FROM t1 ta, t1 tb WHERE ta.y = tb.y;
SELECT * FROM t1 WHERE t1.y = 0;
SELECT * FROM t1 WHERE t1.y = 2000;
SELECT ta.y AS ta_y, ta.s, tb.y AS tb_y, tb.s FROM t1 ta, t1 tb HAVING ta_y = tb_y;
DROP TABLE t1;
--echo #
--echo End of 5.1 tests

19
sql/item_cmpfunc.cc
View file

@ -1190,12 +1190,21 @@ get_year_value(THD *thd, Item ***item_arg, Item **cache_arg,
/*
Coerce value to the 19XX form in order to correctly compare
YEAR(2) & YEAR(4) types.
Here we are converting all item values but YEAR(4) fields since
1) YEAR(4) already has a regular YYYY form and
2) we don't want to convert zero/bad YEAR(4) values to the
value of 2000.
*/
if (value < 70)
value+= 100;
if (value <= 1900)
value+= 1900;
Item *real_item= item->real_item();
if (!(real_item->type() == Item::FIELD_ITEM &&
((Item_field *)real_item)->field->type() == MYSQL_TYPE_YEAR &&
((Item_field *)real_item)->field->field_length == 4))
{
if (value < 70)
value+= 100;
if (value <= 1900)
value+= 1900;
}
/* Convert year to DATETIME of form YYYY-00-00 00:00:00 (YYYY0000000000). */
value*= 10000000000LL;