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MDEV-30659 Server crash on EXPLAIN SELECT/SELECT on table with engine Aria for LooseScan Strategy

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Amended patch from Monty:

The issue was that Loose_scan_opt::save_to_position() did not take
into account records_out from best_access_path()

Make sure that POSITION object filled by Loose_scan_opt::save_to_position()
has records_out not higher than any other possible access method.
This commit is contained in:
Sergei Petrunia
2023-02-21 12:04:37 +03:00
parent d5d7c8ba96
commit d61bc94fa0
6 changed files with 175 additions and 6 deletions
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51
mysql-test/main/selectivity.test
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@ -1376,3 +1376,54 @@ INSERT INTO t2 VALUES (1),(2);
SELECT STRAIGHT_JOIN pk FROM t1 JOIN t2 ON a = pk WHERE b >= 'A' ORDER BY t2.pk LIMIT 8 OFFSET 1;
DROP TABLE t1, t2;
--echo #
--echo # MDEV-30659 Server crash on EXPLAIN SELECT/SELECT on table with
--echo # engine Aria for LooseScan Strategy
--echo #
create table t1 (old_c1 integer, old_c2 integer, c1 integer,
c2 integer, c3 integer) engine=aria;
insert into t1(c1,c2,c3)
values (1,1,1), (1,2,2), (1,3,3),
(2,1,4), (2,2,5), (2,3,6),
(2,4,7), (2,5,8);
create index t1_c2 on t1 (c2,c1);
explain select * from t1 where t1.c2 in (select a.c2 from t1 a) and
c2 >= 3 order by c2;
drop table t1;
create table t1 (old_c1 integer, old_c2 integer, c1 integer,
c2 integer, c3 integer) engine=aria;
delimiter /;
create trigger trg_t1 before update on t1 for each row
begin
set new.old_c1=old.c1;
set new.old_c2=old.c2;
end;
/
delimiter ;/
insert into t1 (c1,c2,c3) values
(1,1,1), (1,2,2), (1,3,3), (2,1,4), (2,2,5), (2,3,6), (2,4,7), (2,5,8);
create index t1_c2 on t1 (c2,c1);
analyze table t1 persistent for all;
create table t2 as select * from t1;
truncate table t1;
insert into t1 select * from t2;
explain select * from t1 where t1.c2 in (select a.c2 from t1 a) and c2 >= 3 order by c2;
drop trigger trg_t1;
drop table t1,t2;
create table t1 (old_c1 integer, old_c2 integer, c1 integer,
c2 integer, c3 integer) engine=aria;
insert into t1 (c1,c2,c3) values
(1,1,1), (1,2,2), (1,3,3), (2,1,4), (2,2,5), (2,3,6), (2,4,7), (2,5,8);
create index t1_c2 on t1 (c2,c1);
create table t2 as select * from t1;
truncate table t1;
insert into t1 select * from t2;
explain select * from t1 where t1.c2 in (select a.c2 from t1 a) and c2 >= 3 order by c2;
drop table t1,t2;