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Fixed bug #26017.

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Objects of the class Item_equal contain an auxiliary member
eval_item of the type cmp_item that is used only for direct 
evaluation of multiple equalities. Currently a multiple equality
is evaluated directly only in the cases when the equality holds
at most for one row in the result set.
The compare collation of eval_item was determined incorectly.
It could lead to returning incorrect results for some queries.


mysql-test/r/join_outer.result:
  Added a test case for bug #26017.
mysql-test/t/join_outer.test:
  Added a test case for bug #26017.
sql/item_cmpfunc.cc:
  Fixed bug #26017.
  Objects of the class Item_equal contain an auxiliary member
  eval_item of the type cmp_item that is used only for direct 
  evaluation of multiple equalities. Currently a multiple equality
  is evaluated directly only in the cases when the equality holds
  at most for one row in the result set.
  The compare collation of eval_item was determined incorrectly.
  It could lead to returning incorrect results for some queries.
sql/item_cmpfunc.h:
  Fixed bug #26017.
  Removed the cmp_collation member from the Item_equal class as useless
  for the current implementation of the class.
This commit is contained in:
unknown 2007-02-09 12:54:50 -08:00
parent 3609c3a4a3
commit 7ab33d5070
4 changed files with 44 additions and 4 deletions
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20
mysql-test/r/join_outer.result
View File

@ -1194,3 +1194,23 @@ a b
3 3
4 NULL
DROP TABLE t1,t2;
CREATE TABLE t1 (
f1 varchar(16) collate latin1_swedish_ci PRIMARY KEY,
f2 varchar(16) collate latin1_swedish_ci
);
CREATE TABLE t2 (
f1 varchar(16) collate latin1_swedish_ci PRIMARY KEY,
f3 varchar(16) collate latin1_swedish_ci
);
INSERT INTO t1 VALUES ('bla','blah');
INSERT INTO t2 VALUES ('bla','sheep');
SELECT * FROM t1 JOIN t2 USING(f1) WHERE f1='Bla';
f1 f2 f3
bla blah sheep
SELECT * FROM t1 LEFT JOIN t2 USING(f1) WHERE f1='bla';
f1 f2 f3
bla blah sheep
SELECT * FROM t1 LEFT JOIN t2 USING(f1) WHERE f1='Bla';
f1 f2 f3
bla blah sheep
DROP TABLE t1,t2;

23
mysql-test/t/join_outer.test
View File

@ -802,3 +802,26 @@ SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.b WHERE (1=1 OR 2=2);
SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.b WHERE (1=1 OR 1=0);
DROP TABLE t1,t2;
#
# Bug 26017: LEFT OUTER JOIN over two constant tables and
# a case-insensitive comparison predicate field=const
#
CREATE TABLE t1 (
f1 varchar(16) collate latin1_swedish_ci PRIMARY KEY,
f2 varchar(16) collate latin1_swedish_ci
);
CREATE TABLE t2 (
f1 varchar(16) collate latin1_swedish_ci PRIMARY KEY,
f3 varchar(16) collate latin1_swedish_ci
);
INSERT INTO t1 VALUES ('bla','blah');
INSERT INTO t2 VALUES ('bla','sheep');
SELECT * FROM t1 JOIN t2 USING(f1) WHERE f1='Bla';
SELECT * FROM t1 LEFT JOIN t2 USING(f1) WHERE f1='bla';
SELECT * FROM t1 LEFT JOIN t2 USING(f1) WHERE f1='Bla';
DROP TABLE t1,t2;

4
sql/item_cmpfunc.cc
View File

@ -4034,11 +4034,9 @@ longlong Item_equal::val_int()
void Item_equal::fix_length_and_dec()
{
Item *item= const_item ? const_item : get_first();
Item *item= get_first();
eval_item= cmp_item::get_comparator(item->result_type(),
item->collation.collation);
if (item->result_type() == STRING_RESULT)
eval_item->cmp_charset= cmp_collation.collation;
}
bool Item_equal::walk(Item_processor processor, byte *arg)

1
sql/item_cmpfunc.h
View File

@ -1296,7 +1296,6 @@ class Item_equal: public Item_bool_func
Item *const_item; /* optional constant item equal to fields items */
cmp_item *eval_item;
bool cond_false;
DTCollation cmp_collation;
public:
inline Item_equal()
: Item_bool_func(), const_item(0), eval_item(0), cond_false(0)