Non Equi Join in hive

Question

有人可以帮助下面的hive查询。我知道下面的操作是行不通的，因为hive不支持非对等连接。

SELECT a.ymd, a.price_close, b.price_close
FROM   stocks a 
JOIN   stocks b ON a.ymd <= b.ymd
WHERE  a.symbol = 'AAPL' AND b.symbol = 'IBM';

Answer 1

可以交叉连接然后过滤:

SELECT a.ymd, a.price_close, b.price_close
FROM   
    (select a.ymd, a.price_close from stocks a where a.symbol = 'AAPL') a
CROSS JOIN (select b.ymd, b.price_close from stocks b where b.symbol = 'IBM') b
WHERE a.ymd <= b.ymd;