code: function(command, callback) {
      var self = this;
      return new Promise(function(resolve, reject) {
          var prCB = function(err, data) {
            if (err) {
              log.error(err.message);
              log.debug(command);
            }
            return (err ? reject('err') : resolve(data));
          };
          self.connection.execute(command, function(err, result) {
            prCB(err, result)
          });
      });
    }
docs: Function to execute the CQL statement through cassandra-driver execute method.
  
  @param string command - A Cassandra query to run.
  @param Object callback