Best way of Unpivoting of hiva table data. Any Analytic function for unpivoting

[mahender bigdata]

Hi,

Has any one implemented Unpivoting of Hive external table data. We would 
like Convert Columns into Multiple Rows. We have external table, which 
holds almost 2 GB of Data. is there best and quicker way of Converting 
columns into Row. Any Analytic functions available in Hive to do Unpivoting.