INSERT ... SELECT Does not produce an optimizer trace

create table t100 (a int, b int);

create table t101 (a int, b int);

insert into t101 select seq, seq from seq_1_to_1000;

set optimizer_trace=1;

insert into t100 select * from t101 where a<= b and a >4;

MariaDB [test]> select * from information_schema.optimizer_trace\G

Empty set (0.002 sec)