protected function addClause($name, $sql, array $parameters, $joiner, $prefix = '', $postfix = '', $is_inclusive = false)
    {
        $name = strtoupper($name);

        if (!isset($this->clauses[$name])) {
            $this->clauses[$name] = new \Octris\Sqlbuilder\Clauses($joiner, $prefix, $postfix);
        }

        $this->clauses[$name]->addClause($sql, $parameters, $is_inclusive);
    }