code: function _attachBatchMethod(qb) {
    /**
     *
     * @param options
     * @param cassakni
     * @param cb
     * @returns {Client|exports|module.exports}
     */
    qb.batch = function (options, cassakni, cb) {
  
      var _options
        , _cassakni
        , _cb;
  
      // options is really cassakni, cassakni is cb
      if (_.isArray(options)) {
        _options = {};
        _cassakni = options;
        _cb = cassakni;
      }
      // standard order
      else {
        _options = options;
        _cassakni = cassakni;
        _cb = cb;
      }
  
      if (!_.isFunction(_cb)) {
        _cb = _.noop;
      }
  
      if (cassandra !== null && cassandra.connected) {
  
        var error = null
          , statements = _.map(_cassakni, function (qb) {
  
            if (!qb.toString || qb.toString() !== duckType) {
              error = new Error("Invalid input to CassanKnex#batch.");
              return {};
            }
            else {
              return {query: qb.cql(), params: qb.bindings()};
            }
          });
  
        if (error) {
          return _cb(error);
        }
  
        cassandra.batch(statements, _options, _cb);
      }
      else {
        _cb(new Error("Cassandra client is not initialized."));
      }
  
      // maintain chain
      return qb;
    };
  }
docs: hooks the 'batch' cassandra client method to our query builder object
  @param qb
  @private