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Bug #55615 and bug #55564

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An user assignment variable expression that's 
evaluated in a logical expression context 
(Item::val_bool()) can be pre-calculated in a 
temporary table for GROUP BY.
However when the expression value is used after the
temp table creation it was re-evaluated instead of
being read from the temp table due to a missing 
val_bool_result() method.
Fixed by implementing the method.
This commit is contained in:
Georgi Kodinov 2010-08-13 14:18:46 +03:00
parent ed736379f5
commit a557509653
4 changed files with 44 additions and 0 deletions
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17
mysql-test/r/user_var.result
View File

@ -430,4 +430,21 @@ CREATE TRIGGER t_after_insert AFTER INSERT ON t1 FOR EACH ROW SET @bug42188 = 10
INSERT INTO t1 VALUES (1);
INSERT INTO t1 VALUES (1);
DROP TABLE t1;
CREATE TABLE t1(a INT);
INSERT INTO t1 VALUES (0),(0);
# BUG#55615 : should not crash
SELECT (@a:=(SELECT @a:=1 FROM t1 LIMIT 1)) AND COUNT(1) FROM t1 GROUP BY @a;
(@a:=(SELECT @a:=1 FROM t1 LIMIT 1)) AND COUNT(1)
1
1
# BUG#55564 : should not crash
SELECT IF(
@v:=LEAST((SELECT 1 FROM t1 t2 LEFT JOIN t1 ON (@v) GROUP BY t1.a), a),
count(*), 1)
FROM t1 GROUP BY a LIMIT 1;
IF(
@v:=LEAST((SELECT 1 FROM t1 t2 LEFT JOIN t1 ON (@v) GROUP BY t1.a), a),
count(*), 1)
1
DROP TABLE t1;
End of 5.1 tests

18
mysql-test/t/user_var.test
View File

@ -328,4 +328,22 @@ INSERT INTO t1 VALUES (1);
INSERT INTO t1 VALUES (1);
DROP TABLE t1;
#
# Bug #55615: debug assertion after using variable in assignment and
# referred to
# Bug #55564: crash with user variables, assignments, joins...
#
CREATE TABLE t1(a INT);
INSERT INTO t1 VALUES (0),(0);
--echo # BUG#55615 : should not crash
SELECT (@a:=(SELECT @a:=1 FROM t1 LIMIT 1)) AND COUNT(1) FROM t1 GROUP BY @a;
--echo # BUG#55564 : should not crash
SELECT IF(
@v:=LEAST((SELECT 1 FROM t1 t2 LEFT JOIN t1 ON (@v) GROUP BY t1.a), a),
count(*), 1)
FROM t1 GROUP BY a LIMIT 1;
DROP TABLE t1;
--echo End of 5.1 tests

8
sql/item_func.cc
View File

@ -4263,6 +4263,14 @@ longlong Item_func_set_user_var::val_int_result()
return entry->val_int(&null_value);
}
bool Item_func_set_user_var::val_bool_result()
{
DBUG_ASSERT(fixed == 1);
check(TRUE);
update(); // Store expression
return entry->val_int(&null_value) != 0;
}
String *Item_func_set_user_var::str_result(String *str)
{
DBUG_ASSERT(fixed == 1);

1
sql/item_func.h
View File

@ -1353,6 +1353,7 @@ public:
my_decimal *val_decimal(my_decimal *);
double val_result();
longlong val_int_result();
bool val_bool_result();
String *str_result(String *str);
my_decimal *val_decimal_result(my_decimal *);
bool is_null_result();