From 4addd31531f722438b8b702c9cd00c28b61efce3 Mon Sep 17 00:00:00 2001 From: Sergei Petrunia Date: Fri, 11 Dec 2020 18:54:21 +0300 Subject: MDEV-21958: Query having many NOT-IN clauses running forever 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. --- mysql-test/main/range.test | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) (limited to 'mysql-test/main/range.test') diff --git a/mysql-test/main/range.test b/mysql-test/main/range.test index 65f580698c5..fab6c8530c2 100644 --- a/mysql-test/main/range.test +++ b/mysql-test/main/range.test @@ -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; -- cgit v1.2.1