如何从AWS的Athena获取结果格式JSON？

Question

我想从AWS中的Athena获取结果值格式JSON。

当我从雅典娜选择时，结果格式如下。

{test.value={report_1=test, report_2=normal, report_3=hard}}

有什么方法可以将JSON格式的结果替换为“：”？

列格式为

map<string,map<string,string>>

Answer 1

select  mycol
from    mytable
;

+--------------------------------------------------------------+
|                            mycol                             |
+--------------------------------------------------------------+
| {test.value={report_3=hard, report_2=normal, report_1=test}} |
+--------------------------------------------------------------+

select  cast (mycol as json) as json
from    mytable
;

+--------------------------------------------------------------------------+
|                                   json                                   |
+--------------------------------------------------------------------------+
| {"test.value":{"report_1":"test","report_2":"normal","report_3":"hard"}} |
+--------------------------------------------------------------------------+