code: private void initialize() {
          cfName = config.getTable();
  
          if (!ArrayUtils.isEmpty(config.getInputColumns())) {
              columns = StringUtils.join(config.getInputColumns(), ",");
          }
  
          partitioner = Utils.newTypeInstance(config.getPartitionerClassName(), IPartitioner.class);
  
          try {
              session = createConnection();
  
              retrieveKeys();
          } catch (Exception e) {
              throw new DeepIOException(e);
          }
  
          rowIterator = new RowIterator();
      }
docs: Initialized this object.
  <p>
  Creates a new client and row iterator.
  </p>