数据的原始结构如下：
superarray:[
array1:{
subarray1:("id":"id1", "position":"1"),
subarray2:("id":"id2", "position":"2"),
subarray3:("id":"id3", "position":"3"),
subarray4:("id":"id4"), "position":"4")
},
array2:{
subarray5:("id":"id5", "position":"5"),
subarray6:("id":"id6", "position":"6"),
subarray7:("id":"id7", "position":"7"),
subarray8:("id":"id8", "position":"8")
},
array3:{
subarray9:("id":"id9, "position":"9")
}
]
我可以使用FROM table, UNNEST(superarray) as super_array提取最外层的数组以给出以下内容：
+------------+-------------------+------------------+----------------------+
| Row_number | super_array.array | super_array.ids | super_array.position |
+------------+-------------------+------------------+----------------------+
| 1 | array1 | id1 | 1 |
| | | id2 | 2 |
| | | id3 | 3 |
| | | id4 | 4 |
| 2 | array2 | id5 | 5 |
| | | id6 | 6 |
| | | id7 | 7 |
| | | id8 | 8 |
| 3 | array3 | id9 | 9 |
+------------+-------------------+------------------+----------------------+
但是我很难获得内在的层次来给出如下内容：
+------------+-------------+------------+----------------+
| Row_number | array.array | array.ids | array.position |
+------------+-------------+------------+----------------+
| 1 | array1 | id1 | 1 |
| 2 | array1 | id2 | 2 |
| 3 | array1 | id3 | 3 |
| 4 | array1 | id4 | 4 |
| 5 | array2 | id5 | 5 |
| 6 | array2 | id6 | 6 |
| 7 | array2 | id7 | 7 |
| 8 | array2 | id8 | 8 |
| 9 | array3 | id9 | 9 |
+------------+-------------+------------+----------------+
如何进行第二次UNNEST而不会出现重复的列错误？我需要INSERT INTO为每个单独的ID添加新行吗？