    private function drain(StreamInterface $source, StreamInterface $sink)
    {
        Psr7\copy_to_stream($source, $sink);
        $sink->seek(0);
        $source->close();

        return $sink;
    }
The software constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component.