Hive: work around for non equi left join

Question

Hive does not support non equi joins: The common work around is to move the join condition to the where clause, which work fine when you want an inner join. but what about a

Answer 1

Not sure if you can avoid using a double join:

SELECT * 
FROM OrderLineItem li 
LEFT OUTER JOIN  (
  SELECT p.*
  FROM ProductPrice p
  JOIN OrderLineItem li 
  ON p.ProductID=li.ProductID 
  WHERE OrderDate BETWEEN StartDate AND EndDate ) p
ON p.ProductId = li.ProductID
WHERE StartDate IS NULL OR 
  OrderDate BETWEEN StartDate AND EndDate;

This way if there is a match and StartDate is not null, there has to be a valid start/end date match.