title: Need to change the partition column to another column and reloading the data into new partitions
body: <p>I am trying to change the already existing partition column to another column.</p>
  
  <p>The current workflow I'm using:</p>
  
  <ol>
  <li>Backup the existing data</li>
  <li>Create a new table with new partition column</li>
  <li>Reload the data into new partitions</li>
  </ol>
  
  <p>My problem:<br>
  Since there is huge data in our existing partition tables, this way will be costly</p>
  
  <p>Is there a way we can do Alter table and change partition column name to another?</p>