diff options
Diffstat (limited to 'mysql-test/main/join_nested.test')
-rw-r--r-- | mysql-test/main/join_nested.test | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/mysql-test/main/join_nested.test b/mysql-test/main/join_nested.test index cc1bd327031..8ac6b5a1d6b 100644 --- a/mysql-test/main/join_nested.test +++ b/mysql-test/main/join_nested.test @@ -1419,3 +1419,41 @@ DROP TABLE t1,t2,t3; set join_cache_level= @save_join_cache_level; set optimizer_switch=@save_optimizer_switch; + +--echo # +--echo # MDEV-27624: Nested left joins with not_exists optimization +--echo # for most inner left join +--echo # + +set @save_join_cache_level= @@join_cache_level; + +CREATE TABLE t1 (a INT NOT NULL, b INT, c INT); +INSERT INTO t1 VALUES (1,1,1), (1,2,1), (1,3,1); + +CREATE TABLE t2(a INT NOT NULL); +INSERT INTO t2 VALUES (1), (2); + +CREATE TABLE t3(a INT not null, b INT); +INSERT INTO t3 VALUES (1, 1), (2, 1), (3, 1); + +let $q= +SELECT * +FROM t1 + LEFT JOIN + ( t2 LEFT JOIN t3 ON t2.a = t3.b ) + ON t2.a = 1 AND (t3.b = t1.a AND t3.a > t1.b OR t3.a is NULL) +WHERE t1.c = 1 AND t3.a is NULL; + +set join_cache_level = 0; +eval EXPLAIN $q; +eval $q; + +set join_cache_level = 2; +eval EXPLAIN $q; +eval $q; + +DROP TABLE t1, t2, t3; + +set join_cache_level= @save_join_cache_level; + +--echo # end of 10.3 tests |