2017-08-09 53 views
2

我是HIVE新手,需要一些帮助来查询我从JSON文件创建的表格。EOF异常查询JSON上的Hive

CREATE TABLE json_table(json string); 
LOAD DATA INPATH '/path/to/file.json' 
INTO TABLE json_table; 

当我查询创建json_table.json有:

SELECT * FROM json_table; 

这将返回:

{"id":243379853,"sampling_rate":null,"timestamp":"2017-08-06 20:05:02","location":{"id":1296,"latitude":"49.863","longitude":"8.651","country":"DE"},"sensor":{"id":2573,"pin":"7","sensor_type":{"id":9,"name":"DHT22","manufacturer":"various"}},"sensordatavalues":[{"id":559959584,"value":"19.00","value_type":"temperature"},{"id":559959585,"value":"86.00","value_type":"humidity"}]} 

我试图得到像

id  | timestampt |   | [...] | 
==========|======================|=======| 
243379853 | 2017-08-06 20:05:02 | [...] | 

结果与查询

SELECT 
    GET_JSON_OBJECT(json_table.json,'$.id'), 
    GET_JSON_OBJECT(json_table.json,'$.timestamp') 
    GET_JSON_OBJECT(json_table.json,'$.sampling_rate') 
    GET_JSON_OBJECT(json_table.json,'$.location.latitude') 
    GET_JSON_OBJECT(json_table.json,'$.location.longitude') 
FROM json_table; 

,但我得到以下蜂巢SQL Exception

java.lang.Exception的:org.apache.hive.service.cli.HiveSQLException:错误在编译声明:失败:ParseException的线4:17失踪EOF在 '(' 近 'GET_JSON_OBJECT'

回答

1

您需要添加逗号:

SELECT 
    GET_JSON_OBJECT(json_table.json,'$.id'), 
    GET_JSON_OBJECT(json_table.json,'$.timestamp'), --here 
    GET_JSON_OBJECT(json_table.json,'$.sampling_rate'), --here 
    GET_JSON_OBJECT(json_table.json,'$.location.latitude'), -- and here 
    GET_JSON_OBJECT(json_table.json,'$.location.longitude') 
FROM json_table; 

我还会为使用expr AS alias的列添加别名。