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select.result, select.test:

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Added test cases for bug #6474.
sql_select.cc:
  Fixed bug #6474. A wrong result was returned when a query
  contained the same equality of the form field=const on
  different AND levels.
This commit is contained in:
igor@rurik.mysql.com 2004-11-10 11:22:39 -08:00
parent 0ebc50b851
commit 597781c1b1
3 changed files with 76 additions and 5 deletions
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33
mysql-test/r/select.result
View file

@ -2333,3 +2333,36 @@ EXPLAIN SELECT i FROM t1 WHERE i=1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 const PRIMARY PRIMARY 4 const 1 Using index
DROP TABLE t1;
CREATE TABLE t1 (
K2C4 varchar(4) character set latin1 collate latin1_bin NOT NULL default '',
K4N4 varchar(4) character set latin1 collate latin1_bin NOT NULL default '0000',
F2I4 int(11) NOT NULL default '0'
) ENGINE=MyISAM DEFAULT CHARSET=latin1;
INSERT INTO t1 VALUES
('W%RT', '0100', 1),
('W-RT', '0100', 1),
('WART', '0100', 1),
('WART', '0200', 1),
('WERT', '0100', 2),
('WORT','0200', 2),
('WT', '0100', 2),
('W_RT', '0100', 2),
('WaRT', '0100', 3),
('WART', '0300', 3),
('WRT' , '0400', 3),
('WURM', '0500', 3),
('W%T', '0600', 4),
('WA%T', '0700', 4),
('WA_T', '0800', 4);
SELECT K2C4, K4N4, F2I4 FROM t1
WHERE K2C4 = 'WART' AND
(F2I4 = 2 AND K2C4 = 'WART' OR (F2I4 = 2 OR K4N4 = '0200'));
K2C4 K4N4 F2I4
WART 0200 1
SELECT K2C4, K4N4, F2I4 FROM t1
WHERE K2C4 = 'WART' AND (K2C4 = 'WART' OR K4N4 = '0200');
K2C4 K4N4 F2I4
WART 0100 1
WART 0200 1
WART 0300 3
DROP TABLE t1;

36
mysql-test/t/select.test
View file

@ -1910,3 +1910,39 @@ EXPLAIN SELECT i FROM t1 WHERE i=1;
EXPLAIN SELECT i FROM t1 WHERE i=1;
DROP TABLE t1;
#
# Test for bug #6474
#
CREATE TABLE t1 (
K2C4 varchar(4) character set latin1 collate latin1_bin NOT NULL default '',
K4N4 varchar(4) character set latin1 collate latin1_bin NOT NULL default '0000',
F2I4 int(11) NOT NULL default '0'
) ENGINE=MyISAM DEFAULT CHARSET=latin1;
INSERT INTO t1 VALUES
('W%RT', '0100', 1),
('W-RT', '0100', 1),
('WART', '0100', 1),
('WART', '0200', 1),
('WERT', '0100', 2),
('WORT','0200', 2),
('WT', '0100', 2),
('W_RT', '0100', 2),
('WaRT', '0100', 3),
('WART', '0300', 3),
('WRT' , '0400', 3),
('WURM', '0500', 3),
('W%T', '0600', 4),
('WA%T', '0700', 4),
('WA_T', '0800', 4);
SELECT K2C4, K4N4, F2I4 FROM t1
WHERE K2C4 = 'WART' AND
(F2I4 = 2 AND K2C4 = 'WART' OR (F2I4 = 2 OR K4N4 = '0200'));
SELECT K2C4, K4N4, F2I4 FROM t1
WHERE K2C4 = 'WART' AND (K2C4 = 'WART' OR K4N4 = '0200');
DROP TABLE t1;

12
sql/sql_select.cc
View file

@ -6639,10 +6639,7 @@ static Item *eliminate_item_equal(COND *cond, COND_EQUAL *upper_levels,
List<Item> eq_list;
Item_func_eq *eq_item= 0;
if (((Item *) item_equal)->const_item() && !item_equal->val_int())
{
cond= new Item_int((char*) "FALSE",0,1);
return cond;
}
return new Item_int((longlong) 0,1);
Item *item_const= item_equal->get_const();
Item_equal_iterator it(*item_equal);
Item *head;
@ -6685,9 +6682,14 @@ static Item *eliminate_item_equal(COND *cond, COND_EQUAL *upper_levels,
}
if (!cond && !eq_list.head())
{
if (!eq_item)
return new Item_int((longlong) 1,1);
return eq_item;
}
eq_list.push_back(eq_item);
if (eq_item)
eq_list.push_back(eq_item);
if (!cond)
cond= new Item_cond_and(eq_list);
else