protected function _buildValues()
    {
        $states =  $this->_schema ? ['schema' => $this->_schema] : [];
        $parts = [];
        foreach ($this->_parts['values'] as $values) {
            $data = [];
            foreach ($values as $key => $value) {
                $states['name'] = $key;
                $data[] = $this->dialect()->value($value, $states);
            }
            $parts[] = '(' . join(', ', $data) . ')';
        }
        return ' VALUES ' . join(', ',$parts);
    }