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Fixed bug mdev-4389.

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The selectivity of a range degenerated into a point never should be set to 0.
This commit is contained in:
Igor Babaev 2013-04-12 02:47:46 -07:00
parent 549ada35b0
commit f3bbd40349
4 changed files with 73 additions and 0 deletions
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22
mysql-test/r/selectivity.result
View File

@ -989,4 +989,26 @@ a b
set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity;
DROP TABLE t1,t2,t3;
set use_stat_tables=@save_use_stat_tables;
#
# Bug mdev-4389: join with degenerated range condition in WHERE
# when optimizer_use_condition_selectivity=3
#
set use_stat_tables=PREFERABLY;
CREATE TABLE t1 (f1 VARCHAR(1));
INSERT t1 VALUES ('p'),('q');
CREATE TABLE t2 (f2 VARCHAR(1));
INSERT INTO t2 VALUES
('o'),('v'),('f'),('f'),('e'),('l'),('j'),('p'),('r'),('j'),
('j'),('u'),('i'),('r'),('x'),('a'),('x'),('s');
ANALYZE TABLE t1, t2;
Table Op Msg_type Msg_text
test.t1 analyze status OK
test.t2 analyze status OK
FLUSH TABLES;
SET optimizer_use_condition_selectivity=3;
SELECT * FROM t1, t2 AS t2a, t2 AS t2b WHERE f1 <= 'a' AND t2a.f2 = f1;
f1 f2 f2
set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity;
DROP TABLE t1,t2;
set use_stat_tables=@save_use_stat_tables;
set use_stat_tables=@save_use_stat_tables;

22
mysql-test/r/selectivity_innodb.result
View File

@ -997,6 +997,28 @@ a b
set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity;
DROP TABLE t1,t2,t3;
set use_stat_tables=@save_use_stat_tables;
#
# Bug mdev-4389: join with degenerated range condition in WHERE
# when optimizer_use_condition_selectivity=3
#
set use_stat_tables=PREFERABLY;
CREATE TABLE t1 (f1 VARCHAR(1));
INSERT t1 VALUES ('p'),('q');
CREATE TABLE t2 (f2 VARCHAR(1));
INSERT INTO t2 VALUES
('o'),('v'),('f'),('f'),('e'),('l'),('j'),('p'),('r'),('j'),
('j'),('u'),('i'),('r'),('x'),('a'),('x'),('s');
ANALYZE TABLE t1, t2;
Table Op Msg_type Msg_text
test.t1 analyze status OK
test.t2 analyze status OK
FLUSH TABLES;
SET optimizer_use_condition_selectivity=3;
SELECT * FROM t1, t2 AS t2a, t2 AS t2b WHERE f1 <= 'a' AND t2a.f2 = f1;
f1 f2 f2
set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity;
DROP TABLE t1,t2;
set use_stat_tables=@save_use_stat_tables;
set use_stat_tables=@save_use_stat_tables;
set optimizer_switch=@save_optimizer_switch_for_selectivity_test;
SET SESSION STORAGE_ENGINE=DEFAULT;

28
mysql-test/t/selectivity.test
View File

@ -591,5 +591,33 @@ DROP TABLE t1,t2,t3;
set use_stat_tables=@save_use_stat_tables;
--echo #
--echo # Bug mdev-4389: join with degenerated range condition in WHERE
--echo # when optimizer_use_condition_selectivity=3
--echo #
set use_stat_tables=PREFERABLY;
CREATE TABLE t1 (f1 VARCHAR(1));
INSERT t1 VALUES ('p'),('q');
CREATE TABLE t2 (f2 VARCHAR(1));
INSERT INTO t2 VALUES
('o'),('v'),('f'),('f'),('e'),('l'),('j'),('p'),('r'),('j'),
('j'),('u'),('i'),('r'),('x'),('a'),('x'),('s');
ANALYZE TABLE t1, t2;
FLUSH TABLES;
SET optimizer_use_condition_selectivity=3;
SELECT * FROM t1, t2 AS t2a, t2 AS t2b WHERE f1 <= 'a' AND t2a.f2 = f1;
set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity;
DROP TABLE t1,t2;
set use_stat_tables=@save_use_stat_tables;
set use_stat_tables=@save_use_stat_tables;

1
sql/sql_statistics.cc
View File

@ -3417,6 +3417,7 @@ double get_column_range_cardinality(Field *field,
else
sel= hist->range_selectivity(min_mp_pos, max_mp_pos);
res= col_non_nulls * sel;
set_if_bigger(res, col_stats->get_avg_frequency());
}
else
res= col_non_nulls;