SET @@session.default_storage_engine = 'blackhole';
create table t1 (a int, b int as (a+1));
ERROR HY000: BLACKHOLE storage engine does not support generated columns
create table t1 (a int not null);
alter table t1 add column b int as (a+1);
ERROR HY000: BLACKHOLE storage engine does not support generated columns
drop table t1;