Doctrine\DBAL\Query\QueryBuilder::__clone PHP Method

    public function __clone()
    {
        foreach ($this->sqlParts as $part => $elements) {
            if (is_array($this->sqlParts[$part])) {
                foreach ($this->sqlParts[$part] as $idx => $element) {
                    if (is_object($element)) {
                        $this->sqlParts[$part][$idx] = clone $element;
                    }
                }
            } elseif (is_object($elements)) {
                $this->sqlParts[$part] = clone $elements;
            }
        }
        foreach ($this->params as $name => $param) {
            if (is_object($param)) {
                $this->params[$name] = clone $param;
            }
        }
    }