database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-07-29 05:21:33 +03:00
Code Activity

Create 'main' test directory and move 't' and 'r' there

Browse Source
This commit is contained in:
Michael Widenius
2018-03-09 14:05:35 +02:00
committed by Monty
parent ab1941266c
commit a7abddeffa
2114 changed files with 75 additions and 77 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
mysql-test/main/table_elim_debug.result Normal file
View File

@ -0,0 +1,22 @@
drop table if exists t1, t2;
create table t1 (a int);
insert into t1 values (0),(1),(2),(3);
create table t2 (a int primary key, b int)
as select a, a as b from t1 where a in (1,2);
explain select t1.a from t1 left join t2 on t2.a=t1.a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4
set optimizer_switch='table_elimination=off';
explain select t1.a from t1 left join t2 on t2.a=t1.a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4
1 SIMPLE t2 eq_ref PRIMARY PRIMARY 4 test.t1.a 1 Using where; Using index
set optimizer_switch='table_elimination=on';
explain select t1.a from t1 left join t2 on t2.a=t1.a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4
set optimizer_switch='table_elimination=default';
explain select t1.a from t1 left join t2 on t2.a=t1.a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4
drop table t1, t2;