mirror of
https://github.com/MariaDB/server.git
synced 2025-10-31 19:06:14 +01:00
28 lines
818 B
Text
28 lines
818 B
Text
#
|
|
# Table elimination (MWL#17) tests that need debug build
|
|
#
|
|
# In MariaDB 5.3, one can switch table_elimination on/off without debug, too:
|
|
## --source include/have_debug.inc
|
|
|
|
--disable_warnings
|
|
drop table if exists t1, t2;
|
|
--enable_warnings
|
|
|
|
# Check if optimizer_switch works
|
|
|
|
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;
|
|
|
|
set optimizer_switch='table_elimination=off';
|
|
explain select t1.a from t1 left join t2 on t2.a=t1.a;
|
|
set optimizer_switch='table_elimination=on';
|
|
explain select t1.a from t1 left join t2 on t2.a=t1.a;
|
|
set optimizer_switch='table_elimination=default';
|
|
explain select t1.a from t1 left join t2 on t2.a=t1.a;
|
|
|
|
drop table t1, t2;
|