code: function(row, callback) {
            var map = {}, value;
            for (var i = 0, j = row.length; i < j; i++) {
              value = row[i];
              // transform the value to either Node, Relationship or Path
              map[resColumns[i]] = utils.transform(value, self);
            }
            return callback(null, map);
          }
docs: each row returned could represent a node, relationship or path