sql - 如何给未嵌套的元组数组起别名？

Question

我正在尝试使用此查询设置一组数据:

WITH CTE AS (
SELECT *
FROM UNNEST([("a",NULL),("b",NULL),("c",1),("d",1),("e",2),("f",3),("g",4),("h",4),("i",4),("j",4),("k",5),("l",5),("m",6),("n",7),("o",7)]) 
)
SELECT *
FROM CTE

产生的结果是:

|Row|f0_|f1_ |
|---|---|----|
| 1 | a |null|
| 2 | b |null|
| 3 | c |1   |
| 4 | d |1   |
| 5 | e |2   |
| 6 | f |3   |
| 7 | g |4   |
| 8 | h |4   |
| 9 | i |4   |
| 10| j |4   |
| 11| k |5   |
| 12| l |5   |
| 13| m |6   |
| 14| n |7   |
| 15| o |7   |

我想要的是:

|Row| x | y  |
|---|---|----|
| 1 | a |null|
| 2 | b |null|
| 3 | c |1   |
| 4 | d |1   |
| 5 | e |2   |
| 6 | f |3   |
| 7 | g |4   |
| 8 | h |4   |
| 9 | i |4   |
| 10| j |4   |
| 11| k |5   |
| 12| l |5   |
| 13| m |6   |
| 14| n |7   |
| 15| o |7   |

Answer 1

使用STRUCT:

WITH CTE AS (
SELECT *
FROM UNNEST([STRUCT("a" as x,NULL as y),("b",NULL),("c",1),("d",1),("e",2),("f",3),("g",4),("h",4),("i",4),("j",4),("k",5),("l",5),("m",6),("n",7),("o",7)]) 
)
SELECT *
FROM CTE