drop table if exists t1,t2;
#
# MDEV-21958: Query having many NOT-IN clauses running forever
#
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);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t2	ALL	PRIMARY,key1	NULL	NULL	NULL	5	Using where
# This should show only ranges in form "(1) <= (key1) <= (1)"
#  ranges over "pk" should not be constructed.
select json_detailed(JSON_EXTRACT(trace, '$**.ranges'))
from information_schema.optimizer_trace;
json_detailed(JSON_EXTRACT(trace, '$**.ranges'))
[
    
    [
        "(1) <= (key1) <= (1)",
        "(2) <= (key1) <= (2)",
        "(3) <= (key1) <= (3)"
    ]
]
set optimizer_trace=@tmp_21958;
drop table t2;