add UDF date_add, date_sub, datediff
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Key: HIVE-313
URL: https://issues.apache.org/jira/browse/HIVE-313
Project: Hadoop Hive
Issue Type: New Feature
Components: Query Processor
Reporter: Zheng Shao
See
http://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.html#function_date-add
See
http://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.html#function_date-sub
See
http://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.html#function_datediff
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