完善hive udf函数 #14
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完善hive udf函数 #14
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增加之间食堂设备不同时间所属食堂查询
跑不出来，增加缓存
链接过多，提出连接到initialize方法中
注释缓存，mysql实例化放到查询方法中
修改mysql链接放到initialize
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添加工作中需要用到的udf函数