docs: function (opts) {
              opts = isUndefined(opts) ? {} : opts;
              var fs = {};
              var nonSqlOptions = this._static.NON_SQL_OPTIONS;
              Object.keys(this.__opts).forEach(function (k) {
                  if (nonSqlOptions.indexOf(k) === -1) {
                      fs[k] = null;
                  }
              });
              return this.mergeOptions(fs).from(opts["alias"] ? this.as(opts["alias"]) : this);
          }