code: public void addColumn(ByteBuffer name, ByteBuffer value, long timestamp) throws IOException
      {
          addColumn(new BufferCell(metadata.comparator.cellFromByteBuffer(name), value, timestamp));
      }
docs: Insert a new "regular" column to the current row (and super column if applicable).
  @param name the column name
  @param value the column value
  @param timestamp the column timestamp