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[英]Is it possible to create flat table from nested json object in AWS Athena?
[英]How get nested json value from the following table in aws athena
这是我们的代码
SELECT "count"(*) "count"
, "httprequest"."country"
, "httprequest"."headers"
FROM waf_logs_17
WHERE ("httprequest"."uri" LIKE '/login')
GROUP BY "httprequest"."clientip", "httprequest"."country","httprequest"."headers"
ORDER BY "count" limit 5
结果如下
数数 | 国家 | 标题 |
---|---|---|
1 | 我们 | [{name=Host, value=app.onlinecheckwriter.com}, {name=X-Forwarded-For, value=75.113.195.00}, {name=X-Forwarded-Proto, value=https}] |
现在的问题是我们如何才能 select 在“httprequest”.“headers”下的 X-Forwarded-For 的值
您的数据不是 json,而是行数组,因此您可以使用数组函数对其进行处理:
-- sample data
WITH dataset (headers) AS (
values (array[cast(row('X-Forwarded-For', '75.113.195.00') as ROW(name varchar, value varchar))] )
)
-- query
select
reduce(headers, NULL, (v, curr) -> if(curr.name = 'X-Forwarded-For', curr.value, v), v -> v)
from dataset
Output:
_col0 |
---|
75.113.195.00 |
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