create table t1 (a int) engine=tokudb;
insert t1 values (1),(2),(3);
set debug_sync='before_admin_operator_func WAIT_FOR go';
OPTIMIZE TABLE t1;
select * from t1;
a
1
2
3
set debug_sync='now SIGNAL go';
Table	Op	Msg_type	Msg_text
test.t1	optimize	status	OK
drop table t1;
set debug_sync='reset';