hive函數 get_json_object

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hive提供了json的解析函數：get_json_object

 

使用方法

對於jsonArray（json數組），如person表的xjson字段有數據：

[{"name":"王二狗","sex":"男","age":"25"},{"name":"李狗嗨","sex":"男","age":"47"}]

取出第一個json對象，那麼hive sql爲：

SELECT get_json_object(xjson,"$.[0]") FROM person;

 結果是：

{"name":"王二狗","sex":"男","age":"25"}

取出第一個json的age字段的值：

SELECT get_json_object(xjson,"$.[0].age") FROM person;

結果

25

 

總結

get_json_object(param1,"$.param2")

 

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