create table emp
(
  emp_id int,
  name varchar(127),
  mgr int
) with system versioning;

insert into emp values (1, 'bill', 0),
                       (2, 'bill', 1),
		       (3, 'kate', 1);
set @ts=now(6);
delete from emp;
insert into emp values (4, 'john', 1);

with ancestors as (select * from emp) select * from ancestors;
set @tmp= "with ancestors as (select * from emp) select * from ancestors";
prepare stmt from @tmp; execute stmt; drop prepare stmt;

with ancestors as (select * from emp for system_time all) select * from ancestors for system_time all;
set @tmp= "with ancestors as (select * from emp for system_time all) select * from ancestors for system_time all";
prepare stmt from @tmp; execute stmt; drop prepare stmt;

with recursive ancestors as (select * from emp) select * from ancestors;
set @tmp= "with recursive ancestors as (select * from emp) select * from ancestors";
prepare stmt from @tmp; execute stmt; drop prepare stmt;

select emp_id from (select emp_id from emp where sys_trx_end>'2031-1-1') as tmp;
set @tmp= "select emp_id from (select emp_id from emp where sys_trx_end>'2031-1-1') as tmp";
prepare stmt from @tmp; execute stmt; drop prepare stmt;

with recursive
ancestors
as
(
  select e.emp_id, e.name, e.mgr
  from emp as e
  where name = 'john'
  union
  select ee.emp_id, ee.name, ee.mgr
  from emp as ee, ancestors as a
  where ee.mgr = a.emp_id
)
select * from ancestors;
set @tmp= "
with recursive
ancestors
as
(
  select e.emp_id, e.name, e.mgr
  from emp as e
  where name = 'john'
  union
  select ee.emp_id, ee.name, ee.mgr
  from emp as ee, ancestors as a
  where ee.mgr = a.emp_id
)
select * from ancestors
";
prepare stmt from @tmp; execute stmt; drop prepare stmt;

with recursive
ancestors
as
(
  select e.emp_id, e.name, e.mgr
  from emp as e for system_time as of timestamp @ts
  where name = 'bill'
  union
  select ee.emp_id, ee.name, ee.mgr
  from emp as ee for system_time as of timestamp @ts, ancestors as a for system_time as of timestamp @ts
  where ee.mgr = a.emp_id
)
select * from ancestors for system_time as of timestamp @ts;
set @tmp= "
with recursive
ancestors
as
(
  select e.emp_id, e.name, e.mgr
  from emp as e for system_time as of timestamp @ts
  where name = 'bill'
  union
  select ee.emp_id, ee.name, ee.mgr
  from emp as ee for system_time as of timestamp @ts, ancestors as a for system_time as of timestamp @ts
  where ee.mgr = a.emp_id
)
select * from ancestors for system_time as of timestamp @ts;
";
prepare stmt from @tmp; execute stmt; drop prepare stmt;

drop table emp;