public byte[] getColumnFamilyBytes() {
    if (null == columnFamilyBytes) {
      columnFamilyBytes = columnFamily.getBytes(Charsets.UTF_8);
    }

    return columnFamilyBytes;
  }
Cached bytes for the columnFamily. Modifications to the bytes will affect those stored in this
ColumnMapping -- such modifications are highly recommended against.

@return UTF8 formatted bytes
accumulo-handler/src/java/org/apache/hadoop/hive/accumulo/columns/HiveAccumuloColumnMapping.java