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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