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Fixed bug mdev-4371.

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Avoid possible division by 0.
This commit is contained in:
Igor Babaev
2013-04-05 13:01:46 -07:00
parent daaa5834c9
commit 503731d80f
4 changed files with 91 additions and 1 deletions
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29
mysql-test/r/selectivity_innodb.result
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@@ -829,6 +829,35 @@ DROP TABLE t1;
set histogram_size=@save_histogram_size;
set histogram_type=@save_histogram_type;
set use_stat_tables=@save_use_stat_tables;
#
# Bug mdev-4371: Join with condition supported by index on an empty table
# with optimizer_use_condition_selectivity=3
#
set use_stat_tables=PREFERABLY;
CREATE TABLE t1 (a int, b int, INDEX(a));
CREATE TABLE t2 (c int);
INSERT INTO t2 VALUES (1),(2),(3),(4),(5),(6),(7),(8);
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;
set @save_optimizer_switch=@@optimizer_switch;
set optimizer_switch='index_condition_pushdown=off';
EXPLAIN EXTENDED
SELECT * FROM t1, t2 WHERE a > 9;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 range a a 5 NULL 1 0.00 Using where
1 SIMPLE t2 ALL NULL NULL NULL NULL 8 100.00 Using join buffer (flat, BNL join)
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`c` AS `c` from `test`.`t1` join `test`.`t2` where (`test`.`t1`.`a` > 9)
SELECT * FROM t1, t2 WHERE a > 9;
a b c
set optimizer_switch=@save_optimizer_switch;
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;