hive get_json_object udf，hivegetjsonobject


+-------------------------------------------------------------------+
                                json
 +-------------------------------------------------------------------+
 {"store":
   {"fruit":[{"weight":8,"type":"apple"},{"weight":9,"type":"pear"}],
    "bicycle":{"price":19.95,"color":"red"}
   },
  "email":"amy@only_for_json_udf_test.net",
  "owner":"amy"
 }
 +-------------------------------------------------------------------+
 json内容可以用以下查询语句解析 
 hive> SELECT get_json_object(src_json.json, '$.owner') FROM src_json;
 amy
 hive> SELECT get_json_object(src_json.json, '$.store.fruit[0]') FROM src_json;
 {"weight":8,"type":"apple"}
 hive> SELECT get_json_object(src_json.json, '$.non_exist_key') FROM src_json;
 NULL

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