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Bug#21555: incorrect behavior with INSERT ... ON DUPL KEY UPDATE and VALUES

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VALUES() was considered a constant. This caused replacing 
 (or pre-calculating) it using uninitialized values before the actual
 execution takes place.
 Mark it as a non-constant (still not dependent of tables) to prevent
 the pre-calculation.
This commit is contained in:
gkodinov/kgeorge@macbook.gmz
2006-09-08 10:24:14 +03:00
parent 580d4a0df4
commit 719f836cc4
3 changed files with 52 additions and 3 deletions
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26
mysql-test/r/insert_update.result
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@ -63,9 +63,9 @@ Warnings:
Note 1003 select test.t1.a AS `a`,test.t1.b AS `b`,test.t1.c AS `c`,values(test.t1.a) AS `VALUES(a)` from test.t1
explain extended select * from t1 where values(a);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
1 SIMPLE t1 ALL NULL NULL NULL NULL 5 Using where
Warnings:
Note 1003 select test.t1.a AS `a`,test.t1.b AS `b`,test.t1.c AS `c` from test.t1
Note 1003 select test.t1.a AS `a`,test.t1.b AS `b`,test.t1.c AS `c` from test.t1 where values(test.t1.a)
DROP TABLE t1;
create table t1(a int primary key, b int);
insert into t1 values(1,1),(2,2),(3,3),(4,4),(5,5);
@ -197,3 +197,25 @@ PRIMARY KEY (a)
) ENGINE=MyISAM;
INSERT INTO t1 ( a ) SELECT 0 ON DUPLICATE KEY UPDATE a = a + VALUES (a) ;
DROP TABLE t1;
CREATE TABLE t1
(
a BIGINT UNSIGNED,
b BIGINT UNSIGNED,
PRIMARY KEY (a)
);
INSERT INTO t1 VALUES (45, 1) ON DUPLICATE KEY UPDATE b =
IF(VALUES(b) > t1.b, VALUES(b), t1.b);
SELECT * FROM t1;
a b
45 1
INSERT INTO t1 VALUES (45, 2) ON DUPLICATE KEY UPDATE b =
IF(VALUES(b) > t1.b, VALUES(b), t1.b);
SELECT * FROM t1;
a b
45 2
INSERT INTO t1 VALUES (45, 1) ON DUPLICATE KEY UPDATE b =
IF(VALUES(b) > t1.b, VALUES(b), t1.b);
SELECT * FROM t1;
a b
45 2
DROP TABLE t1;