create table t1 (f text, vf tinytext as (f), key (vf(64))) engine=innodb;
insert t1 (f) values ('foo');
flush tables;
connect con1,localhost,root,,test;
set debug_sync='TABLE_after_field_clone WAIT_FOR go';
delete from t1;
connection default;
select * from t1;
f	vf
foo	foo
set debug_sync='now SIGNAL go';
connection con1;
disconnect con1;
connection default;
drop table t1;
set debug_sync='reset';