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MDEV-31258 Assertion `cond_selectivity <= 1.000000001' upon range query

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This was caused of two minor issues:
- get_quick_record_count() returned the number of rows for range with
  least cost, when it should have returned the minum number of rows
  for any range.
- When changing REF to RANGE, we also changed records_out, which
  should not be done (number of records in the result will not
  change).

The above change can cause a small change in row estimates where the
optimizer chooses a clustered key with more rows than a range one
secondary key (unlikely case).
This commit is contained in:
Monty
2023-05-27 12:18:49 +03:00
parent 368dd22a81
commit 209fed8eed
3 changed files with 98 additions and 7 deletions
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40
mysql-test/main/range.result
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@ -3786,3 +3786,43 @@ DROP TABLE t1;
set global innodb_stats_persistent= @innodb_stats_persistent_save;
set global innodb_stats_persistent_sample_pages=
@innodb_stats_persistent_sample_pages_save;
#
# MDEV-31258 Assertion `cond_selectivity <= 1.000000001' upon range
# query
#
CREATE TABLE t1 (id int, a int, b char(3), PRIMARY KEY (id), KEY idx (a,b)) ENGINE=InnoDB;
INSERT INTO t1 VALUES
(1,8,'UT'),(2,0,'NU'),(3,1,'SD'),(4,0,'QU'),(5,0,'FL'),(6,0,'ZR'),
(7,3,'LA'),(8,5,'NU'),(9,0,'NU'),(10,0,'SD'),(11,0,'NU'),(12,1,'SD'),
(13,0,'BD'),(14,0,'PA'),(15,0,'VT'),(16,4,'WA'),(17,0,'ME'),(18,6,'OH'),
(19,0,'ME'),(20,4,'NU'),(21,0,'SC'),(22,0,'GA'),(23,1,'CO'),(24,0,'IL'),
(25,0,'GA'),(26,0,'HI'),(27,0,'BU'),(28,0,'NU'),(29,7,'LA'),(30,0,'NU'),
(31,0,'JR'),(32,6,'BR'),(33,0,'NU'),(34,6,'CO'),(35,7,'NU'),(36,2,'LA'),
(37,0,'PR'),(38,1,'UT'),(39,2,'BR'),(40,1,'HI'),(41,0,'SD'),(42,0,'RI'),
(43,2,'LA'),(44,0,'TN'),(45,4,'HI'),(46,0,'VT'),(47,1,'NU'),(48,0,'SC'),
(49,0,'TX'),(50,8,'DC'),(51,4,'NU'),(52,0,'AL'),(53,0,'CO'),(54,9,'PR'),
(55,0,'AR'),(56,0,'SD'),(57,0,'RI'),(58,0,'XE'),(59,0,'NU'),(60,4,'EL'),
(61,2,'LA'),(62,5,'UT'),(63,3,'NU'),(64,0,'RI'),(65,1,'NU'),(66,0,'BR'),
(67,3,'WA'),(68,0,'TN'),(69,3,'HI'),(70,0,'OH'),(71,8,'GA'),(72,6,'AL'),
(73,6,'NU'),(74,1,'HI'),(75,5,'JR'),(76,3,'RI'),(77,0,'DC'),(78,0,'SC'),
(79,0,'CO'),(80,2,'BO'),(81,8,'XE'),(82,1,'NU'),(83,0,'SD'),(84,0,'PA'),
(85,5,'PA'),(86,0,'QU'),(87,0,'PA'),(88,0,'NU'),(89,0,'ND'),(90,0,'UT'),
(91,0,'NU'),(92,0,'NU'),(93,6,'ZR'),(94,0,'NU'),(95,2,'EL'),(96,0,'NU'),
(97,0,'RI'),(98,5,'DC'),(99,7,'JR'),(100,5,'CO'),(101,0,'UT'),(102,0,'QU'),
(103,0,'NU'),(104,0,'GA'),(105,7,'AK'),(106,0,'ZR'),(107,0,'YT'),(108,0,'MD'),
(109,0,'NU'),(110,1,'EL'),(111,0,'ME'),(112,0,'VT'),(113,2,'NU'),(114,0,'CO'),
(115,5,'TN'),(116,0,'OH'),(117,0,'GA'),(118,9,'GA'),(119,0,'CO'),(120,0,'AL'),
(121,0,'NU'),(122,2,'NE'),(123,2,'TX'),(124,3,'CO'),(125,0,'TN'),(126,0,'WA'),
(127,0,'NE'),(128,6,'TN'),(129,0,'BR'),(130,0,'ID'),(131,0,'NU'),(132,2,'EL'),
(133,0,'PR'),(134,0,'NU'),(135,1,'AZ'),(136,7,'EL'),(137,0,'TN'),(138,0,'PA'),
(139,5,'QU'),(140,0,'AR'),(141,0,'DC'),(142,2,'WA'),(143,7,'OH'),(144,2,'CO'),
(145,6,'NU'),(146,9,'FL'),(147,0,'HI'),(148,0,'WA'),(149,1,'BR'),(150,3,'QU');
SELECT id, MIN(id) FROM t1
WHERE (b > 'TX' OR b BETWEEN 'NE' AND 'SC') AND id IN (1,7,8) AND a = 5
GROUP BY id;
id MIN(id)
8 8
DROP TABLE t1;
#
# End of 11.0 tests
#