public static StringDataFrameColumn Add(string value, StringDataFrameColumn right)
        {
            StringDataFrameColumn ret = right.Clone();

            for (int i = 0; i < ret._stringBuffers.Count; i++)
            {
                IList <string> buffer    = ret._stringBuffers[i];
                int            bufferLen = buffer.Count;
                for (int j = 0; j < bufferLen; j++)
                {
                    buffer[j] = value + buffer[j];
                }
            }
            return(ret);
        }