Google bigquery 在Google BigQuery中将键值对拆分为列

我对Google BigQuery很陌生，而且肯定很挣扎

我的表格包含以下内容：

+----------+----------------------------------------+
| order_id |               line_items               |
+----------+----------------------------------------+
|      123 | id:1|qy:1|sum:1.00;id:2|qy:6|sum:4.50; |
+----------+----------------------------------------+
|      456 | id:1|qy:3|sum:3.00;id:3|qy:4|sum:3.20; |
+----------+----------------------------------------+

我需要这样看：

+----------+----+----+------+
| order_id | id | qy | sum  |
+----------+----+----+------+
|      123 |  1 |  1 | 1.00 |
|      123 |  2 |  6 | 4.50 |
|      456 |  1 |  3 | 3.00 |
|      456 |  3 |  4 | 3.20 |
+----------+----+----+------+

行_项中的键值对的数量是任意的（比这3个键值对多得多，但我需要提取这三个键值对）

我能够让下面的UNNEST和SPLIT查询工作，但不幸的是我仍然有这些键值对

这个

把我带到这里：

+----------+------------+
| order_id | line_items |
+----------+------------+
|      123 | id:1       |
|      123 | qy:1       |
|      123 | sum:1.00   |
|      123 | id:2       |
|      123 | qy:6       |
|      123 | sum:4.50;  |
|      456 | id:1       |
|      456 | qy:3       |
|      456 | sum:3.00   |
|      456 | id:3       |
|      456 | qy:4       |
|      456 | sum:3.20   |
+----------+------------+

所以我仍然不能真正理解，如何将这些键提取到列标题和列内容的值

如果有人给我指出正确的方向，我将不胜感激

---

已经非常感谢了

下面是BigQuery标准SQL

#standardSQL
select order_id, 
  ( select split(kv, ':')[offset(1)] from x.kvs kv where split(kv, ':')[offset(0)] = 'id') id,
  ( select split(kv, ':')[offset(1)] from x.kvs kv where split(kv, ':')[offset(0)] = 'qy') qy,
  ( select split(kv, ':')[offset(1)] from x.kvs kv where split(kv, ':')[offset(0)] = 'sum') sum
from `project.dataset.table`,
unnest(split(trim(line_items, ';'), ';')) items,
unnest([struct(split(items,'|') as kvs)]) x
-- order by order_id    

如果要应用于问题中的样本数据，则输出为

下面上面的变化也可能有用

#standardSQL
select order_id, 
  (select value from z.y where key = 'id') id,
  (select value from z.y where key = 'qy') qy,
  (select value from z.y where key = 'sum') sum
from `project.dataset.table`,
unnest(split(trim(line_items, ';'), ';')) items,
unnest([struct(split(items,'|') as kvs)]) x,
unnest([struct(array(
  select as struct 
    split(kv, ':')[offset(0)] as key, 
    split(kv, ':')[offset(1)] value 
  from x.kvs kv
) as y)]) z
-- order by order_id 

---

令人惊叹的！这非常有效。非常感谢你！我现在要试着理解你在那里做什么：D.再次感谢

#standardSQL
select order_id, 
  (select value from z.y where key = 'id') id,
  (select value from z.y where key = 'qy') qy,
  (select value from z.y where key = 'sum') sum
from `project.dataset.table`,
unnest(split(trim(line_items, ';'), ';')) items,
unnest([struct(split(items,'|') as kvs)]) x,
unnest([struct(array(
  select as struct 
    split(kv, ':')[offset(0)] as key, 
    split(kv, ':')[offset(1)] value 
  from x.kvs kv
) as y)]) z
-- order by order_id