在Hive中计算rise涨幅字段大于0的股票代码和最大连续天数

可以使用Hive的窗口函数和自连接实现此计算。首先针对涨幅大于0的行进行排名，然后进行自连接查找相邻的涨幅大于0的行，最后统计每个连续上涨区间的长度。具体的Hive SQL语句如下：

WITH t1 AS (
  SELECT
    stock_code,
    rise,
    ROW_NUMBER() OVER (PARTITION BY stock_code ORDER BY date) AS rn
  FROM
    stock_data
  WHERE
    rise > 0
),
t2 AS (
  SELECT
    t1a.stock_code,
    t1a.rn,
    SUM(CASE WHEN t1b.rise <= 0 THEN 1 ELSE 0 END) OVER (PARTITION BY t1a.stock_code ORDER BY t1b.rn) AS grp
  FROM
    t1 t1a
    LEFT JOIN t1 t1b ON t1a.stock_code = t1b.stock_code AND t1a.rn < t1b.rn
)
SELECT
  stock_code,
  MAX(rn - grp) AS max_days
FROM
  t2
GROUP BY
  stock_code;