select中的非标量相关子查询？

Question

是否可以在选择中使用非标量相关子查询？类似于generate_series如何在select？

中使用

非标量我的意思是返回超过1行（此刻并不真正关注列）：

select
  o1.user_id,
  o1.order_id,
  o1.order_date,
  (select
     o2.order_id
   from orders o2
   where o2.user_id = o1.user_id
     and o2.order_date < o1.order_date
   order by o2.order_date desc
   limit 2) as last_2_orders
from orders o1

有人告诉我，任何可以表示为横向连接的东西都可以表示为相关子查询。所以我试图找到一个可以表达以下内容的相关子查询：

select
  o1.user_id,
  o1.order_id,
  o1.order_date,
  o3.last_2_orders
from orders o1
left join lateral (
  select
    o2.order_id as last_2_orders
  from orders o2
  where o2.user_id = o1.user_id
    and o2.order_date < o1.order_date
  order by o2.order_date desc
  limit 2
) as o3 on true

编辑：此类作品但不符合左外部要求：

select
  o1.user_id,
  o1.order_id,
  o1.order_date,
  unnest(
    array(
      select o2.order_id
      from orders o2
      where o2.user_id = o1.user_id
        and o2.order_date < o1.order_date
      order by o2.order_date desc
      limit 2
    )
  ) as last_2_orders
from orders o1