title: Merge Existing Partition in HIVE
body: <p>How to merge existing Partitions and make it to one Partition.
  For ex : I have Partitions on Year column like year=2011,year=2012,year=2013,year=2014.</p>
  
  <p>My requirement is to merge partitions from 2011 to 2013 partitions.
  So that I can have only 2 partitions 2013 and 2014.</p>
  
  <p>Please help.</p>
  
  <p>Regards,
  Manoj</p>