title: citus, which column can be treated as distribution column
body: <p>I'm a newbie of citus and need an advice that which column will be treated as distribution column when create_distributed_table.</p>
  <p>Exp 1, the snapshot table of order, every row containing an unique order info, the 3 fields, order_id, create_date, update_date, which one is better.</p>
  <p>Exp 2, if there're an table of user access log, such as clicks, sequence_id or click_date, which one?</p>
  <p>Thanks!</p>