#
# MDEV-4029 SELECT on information_schema using a subquery locks up the information_schema table due to incorrect mutexes handling 
#
select variable_name from information_schema.session_status where variable_name =
(select variable_name from information_schema.session_status where variable_name = 'uptime');
variable_name
UPTIME
select variable_name from information_schema.session_variables where variable_name =
(select variable_name from information_schema.session_variables where variable_name = 'basedir');
variable_name
BASEDIR
#
# MDEV-8796 Delete with sub query with information_schema.TABLES deletes too many rows
#
create table t1 (x int);
create table t2 (x int);
create table t3 (x int);
create table t4 AS select table_name from information_schema.TABLES where table_schema = database() and table_type = 'BASE TABLE' ;
delete from t4 where table_name not in (select table_name from information_schema.TABLES where table_schema = database() and table_type = 'BASE TABLE');
select * from t4 order by table_name;
table_name
t1
t2
t3
t4
drop table t1, t2, t3, t4;
# End of 5.5 tests
# INFORMATION_SCHEMA.STATISTICS doesn't show if the index is disabled
create table t1 (a int, key(a));
select index_name, comment from information_schema.statistics where table_schema='test' and table_name='t1';
index_name	comment
a	
alter table t1 disable keys;
select index_name, comment from information_schema.statistics where table_schema='test' and table_name='t1';
index_name	comment
a	disabled
drop table t1;
# End of 10.5 tests