private function _makeBuilderForAggregations($fields)
    {
        $table   = $this->_builder->table;
        $where   = $this->_builder->where;
        $limit   = $this->_builder->limit;
        $offset  = $this->_builder->offset;

        $builder         = new Builder();
        $builder->prefix = "select";
        $builder->fields = $fields;
        $builder->table  = $table;
        $builder->where  = $where;
        $builder->limit  = $limit;
        $builder->offset = $offset;
        return $builder;
    }