无法访问类型为ARRAY <struct <resource string，=“” Permission =“”的字符串，=“” grant =“” bool =“”

Question

=的值的字段权限“”

尝试运行此查询（mytable不是真实的表名）：

遇到此错误：Cannot access field permission on a value with type ARRAY<STRUCT<resource STRING, permission STRING, granted BOOL, ...>> at [2:41]

它在模式中说它只是一个字符串：

当我预览表格时，它看起来像这样：

Answer 1

从下面的模式中可以看到-#standardSQL SELECT DISTINCT x.permission FROM `your_table`, UNNEST(protopayload_auditlog.authorizationInfo) x LIMIT 10 是一个数组

因此，要访问数组元素，请先将其UNNEST删除，如下面的示例所示

#standardSQL
SELECT DISTINCT x.permission
FROM `your_table` t,
t.protopayload_auditlog.authorizationInfo x
LIMIT 10

结果为

注意：上述查询中UNNEST'ing的快捷方式是

how do I concat it to a comma separated string?

  

更新#standardSQL SELECT ARRAY_TO_STRING(ARRAY(SELECT permission FROM t.protopayload_auditlog.authorizationInfo), ',') permissions FROM `your_table` t LIMIT 10

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