HIVE-896 : Add LEAD/LAG/FIRST/LAST analytical windowing functions to Hive. (Harish Butani via Ashutosh Chauhan)

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HIVE-4272 partition wise metadata does not work for text files



git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1463594 13f79535-47bb-0310-9956-ffa450edef68