EXISTS to IN is not reflected in the optimizer trace

--- a/mysql-test/main/subselect_exists2in_costmat.test

+++ b/mysql-test/main/subselect_exists2in_costmat.test

@@ -65,19 +65,24 @@ set @@optimizer_switch = 'exists_to_in=on,in_to_exists=on,semijoin=on,materializ

 -- echo Q1.1m:

 -- echo MATERIALIZATION: there are too many rows in the outer query

 -- echo to be looked up in the inner table.

-EXPLAIN

+EXPLAIN EXTENDED

 SELECT Name FROM Country

 WHERE (EXISTS (select 1 from City where City.Population > 100000 and

 Code = Country) OR

        Name LIKE 'L%') AND

       surfacearea > 1000000;

+

+set optimizer_trace=1;

+

 SELECT Name FROM Country

 WHERE (EXISTS (select 1 from City where City.Population > 100000 and

 Code = Country) OR

        Name LIKE 'L%') AND

       surfacearea > 1000000;

+select * from information_schema.optimizer_trace;

+

 drop database world;

 set optimizer_switch=@subselect_mat_cost;