I have a hive managed partition table (4 partitions) which has 2TB of data and it is stored as ORC tables with no compression. Now I have created a duplicate table with ORC -- SNAPPY compression and inserted the data from old table into the duplicate table. I noticed that it took more loading time than usual I believe that's because of enabling the compression. Then i have checked the file size in duplicate table with snappy compression and it shows somewhere around 2.6TB. Verified the count of both the tables and it remains the same. Any idea why the difference in size even after enabling the snappy compression in ORC?