create table t1 (pk int primary key) engine=Aria;
insert into t1 values (1);
insert into t1 select sleep(2)+1 from t1;
connect  con1,localhost,root,,;
insert into t1 select 2 from t1;
connection default;
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
disconnect con1;
drop table t1;