如何在Hive中將一天的數據填充到整個星期

Question

我有星期六的數據

Date           col1       col2       col3
----------     -----      -----     -----
10/06/2017     1.230      2.210     1.067

我擁有過去三年中每個星期六的此類數據，我需要將數據填充為以下級別的日級粒度：

Date           col1       col2       col3
----------     -----      -----     -----
04/06/2017     1.230      2.210     1.067    
05/06/2017     1.230      2.210     1.067    
06/06/2017     1.230      2.210     1.067    
07/06/2017     1.230      2.210     1.067    
08/06/2017     1.230      2.210     1.067    
09/06/2017     1.230      2.210     1.067    
10/06/2017     1.230      2.210     1.067

Answer 1

select  date_add(t.dt,-pe.pos)  as dt
       ,t.col1
       ,t.col2
       ,t.col3

from    mytable t
        lateral view posexplode(split(space(7 - 1),' ')) pe
;

---

+------------+------+------+------+
|     dt     | col1 | col2 | col3 |
+------------+------+------+------+
| 2017-06-10 | 1.23 | 2.21 | 1.07 |
| 2017-06-09 | 1.23 | 2.21 | 1.07 |
| 2017-06-08 | 1.23 | 2.21 | 1.07 |
| 2017-06-07 | 1.23 | 2.21 | 1.07 |
| 2017-06-06 | 1.23 | 2.21 | 1.07 |
| 2017-06-05 | 1.23 | 2.21 | 1.07 |
| 2017-06-04 | 1.23 | 2.21 | 1.07 |
+------------+------+------+------+