在 Athena 中从 json_array 中提取值

Question

我有JSON数据如下：

[{"all":{"end":"22:00","start":"11:00"},"dayOfWeek":1},{"all":{"end":"22:00","start":"11:00"},"dayOfWeek":2},{"all":{"end":"22:00","start":"11:00"},"dayOfWeek":3},{"all":{"end":"22:00","start":"11:00"},"dayOfWeek":4},{"all":{"end":"22:00","start":"11:00"},"dayOfWeek":5},{"all":{"end":"22:00","start":"11:00"},"dayOfWeek":6},{"all":{"end":"22:00","start":"11:00"},"dayOfWeek":7}]

我需要提取 dayOfWeek、start 和 end 的值尝试了为 Unable to convert varchar to array in Presto Athena 建议的解决方案，但没有成功。

预期结果：

dayOfWeek   start   end
1   11:00   22:00
2   11:00   22:00
3   11:00   22:00
4   11:00   22:00
5   11:00   22:00
6   11:00   22:00
7   11:00   22:00

Answer 1

您可以使用以下查询。已通过版本 0.172 验证。

WITH data(value) AS (VALUES
 '[{"all":{"end":"22:00","start":"11:00"},"dayOfWeek":1},{"all":{"end":"22:00","start":"11:00"},"dayOfWeek":2},{"all":{"end":"22:00","start":"11:00"},"dayOfWeek":3},{"all":{"end":"22:00","start":"11:00"},"dayOfWeek":4},{"all":{"end":"22:00","start":"11:00"},"dayOfWeek":5},{"all":{"end":"22:00","start":"11:00"},"dayOfWeek":6},{"all":{"end":"22:00","start":"11:00"},"dayOfWeek":7}]'
),
parsed(c1) AS (
  SELECT cast(json_parse(value) AS array(json)) 
  FROM data
)
SELECT 
  json_extract_scalar(json1, '$.dayOfWeek') AS "dayOfWeek"
 ,json_extract_scalar(json1, '$.all.start') AS "start"
 ,json_extract_scalar(json1, '$.all.end') AS "end"
FROM parsed, unnest(c1) as t(json1)

在 Athena 中从 json_array 中提取值

Extract values from json_array in Athena

hive

presto

amazon-athena