如何解决我可以将包含字符串化数组的行值转换为BigQuery中的数组
我有一行,其值是数组的字符串。我需要将其转换为数组。
我尝试使用SUBSTR
函数通过删除引号来转换它。
WITH k AS (SELECT 1 as id,(SELECT after.ClientIds
FROM `kube-playground.events.login_v2_users`) AS c)
Select id,ARRAY(SELECT * FROM UNNEST(SPLIT(SUBSTR(c,2,LENGTH(c) - 2)))) AS x from k
失败,因为标量子查询产生了多个元素。有关此问题的任何提示或想法吗?谢谢
解决方法
以下是用于BigQuery标准SQL
您可以仅使用JSON_EXTRACT_ARRAY,如以下示例所示
#standardSQL
SELECT JSON_EXTRACT_ARRAY(ClientIds)
FROM `kube-playground.events.login_v2_users`
您可以如下进行测试
#standardSQL
WITH `kube-playground.events.login_v2_users` AS (
SELECT '[{"time":"asd","id":"qwe"},{"time":"asd2","id":"qwe2"},{"time":"asd3","id":"qwe3"}]' ClientIds UNION ALL
SELECT '[{"time":"aseft","id":"sdf"},{"time":"aseft2","id":"sdf2"}]'
)
SELECT JSON_EXTRACT_ARRAY(ClientIds)
FROM `kube-playground.events.login_v2_users`
有结果
Row f0_
1 {"time":"asd","id":"qwe"}
{"time":"asd2","id":"qwe2"}
{"time":"asd3","id":"qwe3"}
2 {"time":"aseft","id":"sdf"}
{"time":"aseft2","id":"sdf2"}
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