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.

(Backport to 10.2)
This commit is contained in:
Sergei Petrunia
2020-12-15 14:38:30 +03:00
parent ac9c6f53a5
commit 066212d16c
3 changed files with 60 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
mysql-test/r/range.result
View File

@ -3158,6 +3158,21 @@ pk a b
1 5 50
65 5 50
drop table t1;
create table t1(a int);
insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t2 (
pk int primary key,
key1 int,
col1 varchar(255),
key (key1, pk)
);
insert into t2 (pk, key1)
select A.a+10 *B.a + 100*C.a, A.a+10 *B.a +100*C.a from t1 A, t1 B, t1 C;
# This must use ALL, not range:
explain select * from t2 force index (primary) where pk not in (1,2,3);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL PRIMARY NULL NULL NULL 1000 Using where
drop table t1,t2;
#
# End of 10.2 tests
#