code: private static Mutation createMutation(byte[] colName, byte[] colValue, long timestamp) {
          if (colValue == null) {
              colValue = EMPTY_BYTES;
          }
          Column col = new Column();
          col.setName(colName);
          col.setValue(colValue);
          col.setTimestamp(timestamp);
          
          ColumnOrSuperColumn cosc = new ColumnOrSuperColumn();
          cosc.setColumn(col);
          
          Mutation mutation = new Mutation();
          mutation.setColumn_or_supercolumn(cosc);
          return mutation;
      }
docs: Create a Mutation with the given column name and column value