Details
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Bug
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Status: Closed (View Workflow)
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Major
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Resolution: Fixed
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5.5, 10.1, 10.2, 10.3, 10.4
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None
Description
CREATE TABLE t1 (i1 int, c1 varchar(20), pk int) engine=myisam; |
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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); |
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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); |
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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)
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10.4 592fe954ef82be1b |
MariaDB [test]> SELECT count(t3.c1)
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-> FROM t3 LEFT JOIN t1 LEFT JOIN t2 ON t1.i1 = t2.i1 ON t3.i1 = t1.i1
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-> WHERE t2.pk < 13 OR t3.i1 IS NULL;
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+--------------+
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| count(t3.c1) |
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+--------------+
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| 21 |
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+--------------+
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1 row in set (0.003 sec)
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MariaDB [test]> SELECT t3.*
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-> FROM t3 LEFT JOIN t1 LEFT JOIN t2 ON t1.i1 = t2.i1 ON t3.i1 = t1.i1
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-> WHERE t2.pk < 13 OR t3.i1 IS NULL;
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+------+------+------+
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| pk | c1 | i1 |
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+------+------+------+
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| 4 | a | NULL |
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| 5 | a | NULL |
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| 6 | a | NULL |
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| 7 | a | NULL |
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| 11 | a | NULL |
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| 14 | a | NULL |
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| 15 | a | NULL |
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| 18 | a | 2 |
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| 20 | a | 5 |
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| 25 | a | 5 |
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| 17 | a | NULL |
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| 26 | a | NULL |
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| 27 | a | NULL |
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| 29 | a | NULL |
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| 30 | a | NULL |
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| 35 | a | 5 |
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| 37 | a | NULL |
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| 45 | a | NULL |
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| 46 | a | NULL |
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| 48 | a | NULL |
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| 50 | a | NULL |
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+------+------+------+
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21 rows in set (0.005 sec)
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10.3 592dc59d7a5f9bd80bf |
MariaDB [test]> SELECT count(t3.c1)
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-> FROM t3
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-> LEFT JOIN t1 LEFT JOIN t2 ON t1.i1 = t2.i1 ON t3.i1 = t1.i1
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-> WHERE t2.pk < 13 OR t3.i1 IS NULL;
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+--------------+
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| count(t3.c1) |
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+--------------+
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| 17 |
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+--------------+
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1 row in set (0.001 sec)
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