mysql-test/main/table_elim_debug.test


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#
# 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;