Enable replicate-rewrite-db in multi source

The task would enable online operations only using SQL command

We would following workflow

set global replicate-same-server-id=1:

CHANGE MASTER 'online' TO master_host='127.0.0.1, master_user='skysql' , master_password='skyvodka' ;

set global online.replicate_do_table='db1.t';
set global online.rewrite_db='db->db_new';
create or replace database db_new;
create or replace table db_new.t like db_new.t ;

-> online operation to be produce resharding or ddl
alter table db_new.t add column c1 int ;
LOCK TABLE db_new.t
set global online.@@slav_pos = @@current_pos;

CHANGE MASTER 'online' TO master_use_gtid=slave_pos
START SLAVE;
UNLOCK TABLE db_new.t

insert ignore into db_new.t select * from db.t

Wait to catch replication
rename atomic of the 2 tables

reset replication