database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-07-30 16:24:05 +03:00
Code Activity

MDEV-21958: Query having many NOT-IN clauses running forever

Browse Source 
Basic variant of the fix: do not consider conditions in form

  unique_key NOT IN (c1,c2...)

to be sargable. If there are only a few constants, the condition
is not selective. If there are a lot constants, the overhead of
processing such a huge range list is not worth it.
This commit is contained in:
Sergei Petrunia
2020-12-11 18:54:21 +03:00
parent 0adbf27f00
commit 4addd31531
4 changed files with 108 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
mysql-test/main/range.test
View File

@ -2207,6 +2207,30 @@ let $a= `select group_concat(a) from t2`;
eval analyze SELECT * FROM t1 where a in ($a);
drop table t1,ten,t2;
--echo #
--echo # MDEV-21958: Query having many NOT-IN clauses running forever
--echo #
create table t2 (
pk int primary key,
key1 int,
col1 int,
key (key1, pk)
);
insert into t2 (pk, key1) values (1,1),(2,2),(3,3),(4,4),(5,5);
set @tmp_21958=@@optimizer_trace;
set optimizer_trace=1;
explain select * from t2 where key1 in (1,2,3) and pk not in (1,2,3);
--echo # This should show only ranges in form "(1) <= (key1) <= (1)"
--echo # ranges over "pk" should not be constructed.
select json_detailed(JSON_EXTRACT(trace, '$**.ranges'))
from information_schema.optimizer_trace;
set optimizer_trace=@tmp_21958;
drop table t2;
--echo # End of 10.4 tests
set global innodb_stats_persistent= @innodb_stats_persistent_save;