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MDEV-6209: Assertion `join->best_read < double(1.79769313486231570815e+308L ...

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- Use floating-point division in selectivity calculations.
This commit is contained in:
Sergey Petrunya
2014-05-05 13:24:54 +03:00
parent d130cef416
commit 504068b093
3 changed files with 24 additions and 1 deletions
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10
mysql-test/r/selectivity_no_engine.result
View File

@ -205,6 +205,16 @@ Warnings:
Note 1003 select `test`.`t0`.`a` AS `a`,`test`.`t1`.`kp1` AS `kp1`,`test`.`t1`.`kp2` AS `kp2`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2` from `test`.`t0` join `test`.`t1` where ((`test`.`t1`.`kp1` = `test`.`t0`.`a`) and (`test`.`t1`.`kp2` = 4))
drop table t0, t1;
#
# MDEV-6209: Assertion `join->best_read < double(1.79769313486231570815e+308L)'
# failed in bool greedy_search with optimizer_use_condition_selectivity>1
#
SET optimizer_use_condition_selectivity = 2;
CREATE TABLE t1 (a CHAR(6), b INT, PRIMARY KEY (a,b)) ENGINE=MyISAM;
INSERT INTO t1 VALUES ('foo',1),('bar',2);
SELECT * FROM t1 AS t1_1, t1 AS t1_2 WHERE NOT ( t1_1.a <> 'baz');
a b a b
DROP TABLE t1;
#
# End of the test file
#
set use_stat_tables= @save_use_stat_tables;

13
mysql-test/t/selectivity_no_engine.test
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@ -148,6 +148,19 @@ explain extended select * from t0, t1 where t1.kp1=t0.a and t1.kp2=t0.a+1;
--echo # NOTE: t0: 10*100% is ok, t1: 10*9.90% is bad. t1 should have 10*100%.
explain extended select * from t0, t1 where t1.kp1=t0.a and t1.kp2=4;
drop table t0, t1;
--echo #
--echo # MDEV-6209: Assertion `join->best_read < double(1.79769313486231570815e+308L)'
--echo # failed in bool greedy_search with optimizer_use_condition_selectivity>1
--echo #
SET optimizer_use_condition_selectivity = 2;
CREATE TABLE t1 (a CHAR(6), b INT, PRIMARY KEY (a,b)) ENGINE=MyISAM;
INSERT INTO t1 VALUES ('foo',1),('bar',2);
SELECT * FROM t1 AS t1_1, t1 AS t1_2 WHERE NOT ( t1_1.a <> 'baz');
DROP TABLE t1;
--echo #
--echo # End of the test file
--echo #

2
sql/sql_select.cc
View File

@ -7349,7 +7349,7 @@ double table_cond_selectivity(JOIN *join, uint idx, JOIN_TAB *s,
}
keyparts++;
}
sel /= table->quick_rows[key] / table->stat_records();
sel /= (double)table->quick_rows[key] / (double) table->stat_records();
}
}