impala自定义udf函数
查看内置的函数：
show functions in _impala_builtins;
show functions in _impala_builtins like ‘subs‘;
查看自定义函数：
show functions
自定义函数：
[hadoop06.xqtravel.com:21000] > create function statistics_client(string) returns string location ‘/xqtravel-boss-bd/impala-udf/xqtravel-service-hive-udf-1.0-SNAPSHOT.jar’ symbol=”StatisticsClient”;
[hadoop06.xqtravel.com:21000] > drop function statisticsClient(string);
代码：