Details
-
Bug
-
Status: Closed (View Workflow)
-
Major
-
Resolution: Fixed
-
5.5(EOL), 10.1(EOL), 10.2(EOL), 10.3(EOL), 10.4(EOL)
-
None
Description
CREATE TABLE t1 (i1 int, c1 varchar(20), pk int) engine=myisam; |
|
|
CREATE TABLE t2 (pk int, c1 varchar(20), i1 int) engine=myisam; |
INSERT INTO t2 VALUES (1,'a',NULL),(2,'a',777),(3,'a',192),(4,'a',284),(5,'a',2),(6,'a',NULL),(7,'a',-912),(8,'a',5),(9,'a',NULL),(10,'a',-184); |
|
|
CREATE TABLE t3 (pk int, c1 varchar(20), i1 int) engine=myisam ; |
INSERT INTO t3 VALUES (1,'a',-145),(2,'a',6),(3,'a',1),(4,'a',NULL),(5,'a',NULL),(6,'a',NULL),(7,'a',NULL),(8,'a',889),(9,'a',146),(10,'a',177),(11,'a',NULL),(12,'a',-183),(13,'a',-137),(14,'a',NULL),(15,'a',NULL),(16,'a',-433),(17,'a',NULL),(18,'a',2),(19,'a',3),(20,'a',5),(21,'a',-484),(22,'a',369),(23,'a',-192),(24,'a',-163),(25,'a',5),(26,'a',NULL),(27,'a',NULL),(28,'a',1),(29,'a',NULL),(30,'a',NULL),(31,'a',127),(32,'a',-424),(33,'a',3),(34,'a',-144),(35,'a',5),(36,'a',913),(37,'a',NULL),(38,'a',6),(39,'a',-173),(40,'a',4),(41,'a',101),(42,'a',-795),(43,'a',201),(44,'a',103),(45,'a',NULL),(46,'a',NULL),(47,'a',6),(48,'a',NULL),(49,'a',9),(50,'a',NULL); |
|
|
SELECT count(t3.c1) |
FROM t3 LEFT JOIN t1 LEFT JOIN t2 ON t1.i1 = t2.i1 ON t3.i1 = t1.i1 |
WHERE t2.pk < 13 OR t3.i1 IS NULL; |
The expected result is 17 rows. It is correct in versions 5.5-10.3 (and in Mysql 8.0.15), and also while using Innodb engine in 10.4
The current result in 10.4 is 21 rows (with MyIsam)
|
10.4 592fe954ef82be1b |
MariaDB [test]> SELECT count(t3.c1)
|
-> FROM t3 LEFT JOIN t1 LEFT JOIN t2 ON t1.i1 = t2.i1 ON t3.i1 = t1.i1
|
-> WHERE t2.pk < 13 OR t3.i1 IS NULL;
|
+--------------+
|
| count(t3.c1) |
|
+--------------+
|
| 21 |
|
+--------------+
|
1 row in set (0.003 sec)
|
|
|
|
|
MariaDB [test]> SELECT t3.*
|
-> FROM t3 LEFT JOIN t1 LEFT JOIN t2 ON t1.i1 = t2.i1 ON t3.i1 = t1.i1
|
-> WHERE t2.pk < 13 OR t3.i1 IS NULL;
|
+------+------+------+
|
| pk | c1 | i1 |
|
+------+------+------+
|
| 4 | a | NULL |
|
| 5 | a | NULL |
|
| 6 | a | NULL |
|
| 7 | a | NULL |
|
| 11 | a | NULL |
|
| 14 | a | NULL |
|
| 15 | a | NULL |
|
| 18 | a | 2 |
|
| 20 | a | 5 |
|
| 25 | a | 5 |
|
| 17 | a | NULL |
|
| 26 | a | NULL |
|
| 27 | a | NULL |
|
| 29 | a | NULL |
|
| 30 | a | NULL |
|
| 35 | a | 5 |
|
| 37 | a | NULL |
|
| 45 | a | NULL |
|
| 46 | a | NULL |
|
| 48 | a | NULL |
|
| 50 | a | NULL |
|
+------+------+------+
|
21 rows in set (0.005 sec)
|
|
|
10.3 592dc59d7a5f9bd80bf |
MariaDB [test]> SELECT count(t3.c1)
|
-> FROM t3
|
-> LEFT JOIN t1 LEFT JOIN t2 ON t1.i1 = t2.i1 ON t3.i1 = t1.i1
|
-> WHERE t2.pk < 13 OR t3.i1 IS NULL;
|
+--------------+
|
| count(t3.c1) |
|
+--------------+
|
| 17 |
|
+--------------+
|
1 row in set (0.001 sec)
|
|