code: private static Mutation createDeleteColumnMutation(byte[] colName, long timestamp) {
          SlicePredicate slicePred = new SlicePredicate();
          slicePred.addToColumn_names(ByteBuffer.wrap(colName));
          
          Deletion deletion = new Deletion();
          deletion.setPredicate(slicePred);
          deletion.setTimestamp(timestamp);
          
          Mutation mutation = new Mutation();
          mutation.setDeletion(deletion);
          return mutation;
      }
docs: Create a column mutation that deletes the given column name.