--disable_warnings
drop table if exists t1,t2;
--enable_warnings

#
#  SELECT that uses a virtual column and executed with BKA
#

create table t1 (a int, b int);
insert into t1 values (3, 30), (4, 20), (1, 20);
create table t2 (c int, d int, v int as (d+1), index idx(c));
insert into t2(c,d) values 
  (20, 100), (20, 300), (30, 100), (30, 200), (40, 500),
  (70, 100), (40, 300), (60, 100), (40, 100), (70, 100);                           

set join_cache_level=6;
explain
select * from t1,t2 where t1.b=t2.c and d <= 100;

select * from t1,t2 where t1.b=t2.c and d <= 100;
set join_cache_level=default;

drop table t1, t2;