text: --insert data
  create or replace function insert_mm_01(dat text) returns void as $$
  declare
  	times integer :=1;
  begin
  	loop
  		insert into partition_interval_parallel values(1, 1, dat);
  		times = times + 1;
  		if times > 500 then
  			exit;
  		end if;
    end loop;
  end;
  $$ language plpgsql;
  
  
  select insert_mm_01('2020-05-1');
  select insert_mm_01('2020-06-1');
  select insert_mm_01('2020-07-1');
  select insert_mm_01('2020-08-1');
  select insert_mm_01('2020-09-1');
  select insert_mm_01('2020-10-1');
  select insert_mm_01('2020-11-1');
  