yii\sphinx\QueryBuilder::buildSelectFields PHP Метод

    private function buildSelectFields($columns, &$params)
    {
        if (empty($columns)) {
            return '*';
        }
        foreach ($columns as $i => $column) {
            if ($column instanceof Expression) {
                $columns[$i] = $column->expression;
                $params = array_merge($params, $column->params);
            } elseif (is_string($i)) {
                if (strpos($column, '(') === false) {
                    $column = $this->db->quoteColumnName($column);
                }
                $columns[$i] = "{$column} AS " . $this->db->quoteColumnName($i);
            } elseif (strpos($column, '(') === false) {
                if (preg_match('/^(.*?)(?i:\\s+as\\s+|\\s+)([\\w\\-_\\.]+)$/', $column, $matches)) {
                    $columns[$i] = $this->db->quoteColumnName($matches[1]) . ' AS ' . $this->db->quoteColumnName($matches[2]);
                } else {
                    $columns[$i] = $this->db->quoteColumnName($column);
                }
            }
        }
        return implode(', ', $columns);
    }