（十二）Hive分析窗口函数(四) LAG、LEAD、FIRST_VALUE和LAST_VALUE

  数据准备   数据格式 cookie4.txt cookie1,2015-04-10 10:00:02,url2 cookie1,2015-04-10 10:00:00,url1 cookie1,2015-04-10 10:03:04,1url3 cookie1,2015-04-10 10:50:05,url6 cookie1,2015-04-10 11:00:00,url7 cookie1,

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