yii\sphinx\QueryBuilder::buildSelect PHP Method

    public function buildSelect($columns, &$params, $distinct = false, $selectOption = null)
    {
        $select = $distinct ? 'SELECT DISTINCT' : 'SELECT';
        if ($selectOption !== null) {
            $select .= ' ' . $selectOption;
        }
        return $select . ' ' . $this->buildSelectFields($columns, $params);
    }