code: public void writeTo(DataOutputPlus output) throws IOException
      {
          ByteBufferUtil.writeWithShortLength(column, output);
          operator.writeTo(output);
          ByteBufferUtil.writeWithShortLength(value, output);
      }
docs: Write the serialized version of this <code>IndexExpression</code> to the specified output.
  
  @param output the output to write to
  @throws IOException if an I/O problem occurs while writing to the specified output