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MDEV-8779: mysqld got signal 11 in sql/opt_range_mrr.cc:100(step_down_to)

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The crash was caused by range optimizer using RANGE_OPT_PARAM::min_key
(and max_key) to store keys. Buffer size was a good upper bound for
range analysis and partition pruning, but not for EITS selectivity
calculations.

Fixed by making these buffers variable-size. The sizes are calculated
from [pseudo]indexes used for range analysis.
This commit is contained in:
Sergei Petrunia
2015-09-20 21:31:02 +03:00
parent 139ce6cb18
commit 9b9e36ed49
4 changed files with 73 additions and 4 deletions
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17
mysql-test/r/selectivity_no_engine.result
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@@ -276,6 +276,23 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
Warnings:
Note 1003 select `test`.`ta`.`a` AS `a`,`test`.`tb`.`a` AS `a` from `test`.`t1` `ta` join `test`.`t2` `tb` where ((`test`.`tb`.`a` = `test`.`ta`.`a`) and (`test`.`ta`.`a` < 40) and (`test`.`ta`.`a` < 100))
drop table t0,t1,t2;
#
# MDEV-8779: mysqld got signal 11 in sql/opt_range_mrr.cc:100(step_down_to)
#
set @tmp_mdev8779=@@optimizer_use_condition_selectivity;
set optimizer_use_condition_selectivity=5;
CREATE TABLE t1 (
i int(10) unsigned NOT NULL AUTO_INCREMENT,
n varchar(2048) NOT NULL,
d tinyint(1) unsigned NOT NULL,
p int(10) unsigned NOT NULL,
PRIMARY KEY (i)
) DEFAULT CHARSET=utf8;
insert into t1 values (1,'aaa',1,1), (2,'bbb',2,2);
SELECT * FROM t1 WHERE t1.d = 0 AND t1.p = '1' AND t1.i != '-1' AND t1.n = 'some text';
i n d p
set optimizer_use_condition_selectivity= @tmp_mdev8779;
DROP TABLE t1;
#
# End of the test file
#