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Diffstat (limited to 'mysql-test/main/join_nested_jcl6.result')
| -rw-r--r-- | mysql-test/main/join_nested_jcl6.result | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/mysql-test/main/join_nested_jcl6.result b/mysql-test/main/join_nested_jcl6.result index 6ac34a8728d..d39bf7f373f 100644 --- a/mysql-test/main/join_nested_jcl6.result +++ b/mysql-test/main/join_nested_jcl6.result @@ -1977,6 +1977,39 @@ Note 1003 select 1 AS `K1`,'T1Row1' AS `Name`,`t2a`.`K2` AS `K2`,`t2a`.`K1r` AS DROP VIEW v1; DROP TABLE t1,t2; set optimizer_search_depth= @tmp_mdev621; +# +# MDEV-19588: Nested left joins using optimized join cache +# +set optimizer_switch='optimize_join_buffer_size=on'; +set @save_join_cache_level= @@join_cache_level; +set join_cache_level=2; +CREATE TABLE t1 (i1 int, c1 varchar(20), pk int) engine=myisam; +CREATE TABLE t2 (pk int, c1 varchar(20), i1 int) engine=myisam; +INSERT INTO t2 VALUES (7,'a',-912),(8,'a',5); +CREATE TABLE t3 (pk int, c1 varchar(20), i1 int) engine=myisam; +INSERT INTO t3 VALUES +(1,'a',-145),(2,'a',6),(3,'a',1),(7,'a',NULL),(8,'a',889),(9,'a',146), +(10,'a',177),(16,'a',-433),(17,'a',NULL),(18,'a',2),(19,'a',3),(20,'a',5), +(21,'a',-484),(22,'a',369),(23,'a',-192),(24,'a',-163),(25,'a',5),(26,'a',NULL); +SELECT t3.* +FROM t3 LEFT JOIN t1 LEFT JOIN t2 ON t1.i1 = t2.i1 ON t3.i1 = t1.i1 +WHERE t2.pk < 13 OR t3.i1 IS NULL; +pk c1 i1 +7 a NULL +17 a NULL +26 a NULL +explain extended SELECT t3.* +FROM t3 LEFT JOIN t1 LEFT JOIN t2 ON t1.i1 = t2.i1 ON t3.i1 = t1.i1 +WHERE t2.pk < 13 OR t3.i1 IS NULL; +id select_type table type possible_keys key key_len ref rows filtered Extra +1 SIMPLE t3 ALL NULL NULL NULL NULL 18 100.00 +1 SIMPLE t1 ALL NULL NULL NULL NULL 0 0.00 Using where; Using join buffer (flat, BNL join) +1 SIMPLE t2 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join) +Warnings: +Note 1003 select `test`.`t3`.`pk` AS `pk`,`test`.`t3`.`c1` AS `c1`,`test`.`t3`.`i1` AS `i1` from `test`.`t3` left join (`test`.`t1` left join `test`.`t2` on(`test`.`t2`.`i1` = `test`.`t3`.`i1`)) on(`test`.`t1`.`i1` = `test`.`t3`.`i1`) where `test`.`t2`.`pk` < 13 or `test`.`t3`.`i1` is null +DROP TABLE t1,t2,t3; +set join_cache_level= @save_join_cache_level; +set optimizer_switch=@save_optimizer_switch; CREATE TABLE t5 (a int, b int, c int, PRIMARY KEY(a), KEY b_i (b)); CREATE TABLE t6 (a int, b int, c int, PRIMARY KEY(a), KEY b_i (b)); CREATE TABLE t7 (a int, b int, c int, PRIMARY KEY(a), KEY b_i (b)); |