text: drop table if exists onlineddl_test;
  create table onlineddl_test (
    id int auto_increment,
    i int not null,
    ts0 timestamp default current_timestamp,
    ts1 timestamp default current_timestamp,
    ts2 timestamp default current_timestamp,
    updated tinyint unsigned default 0,
    primary key(id),
    key i_idx(i)
  ) auto_increment=1;
  
  drop event if exists onlineddl_test;
  delimiter ;;
  create event onlineddl_test
    on schedule every 1 second
    starts current_timestamp
    ends current_timestamp + interval 60 second
    on completion not preserve
    enable
    do
  begin
    insert into onlineddl_test values (null, 11, null, now(), now(), 0);
    update onlineddl_test set ts2=now() + interval 10 minute, updated = 1 where i = 11 order by id desc limit 1;
  
    set session time_zone='system';
    insert into onlineddl_test values (null, 13, null, now(), now(), 0);
    update onlineddl_test set ts2=now() + interval 10 minute, updated = 1 where i = 13 order by id desc limit 1;
  
    set session time_zone='+00:00';
    insert into onlineddl_test values (null, 17, null, now(), now(), 0);
    update onlineddl_test set ts2=now() + interval 10 minute, updated = 1 where i = 17 order by id desc limit 1;
  
    set session time_zone='-03:00';
    insert into onlineddl_test values (null, 19, null, now(), now(), 0);
    update onlineddl_test set ts2=now() + interval 10 minute, updated = 1 where i = 19 order by id desc limit 1;
  
    set session time_zone='+05:00';
    insert into onlineddl_test values (null, 23, null, now(), now(), 0);
    update onlineddl_test set ts2=now() + interval 10 minute, updated = 1 where i = 23 order by id desc limit 1;
  end ;;
  