This query does not show realtime metrics:

```
INSERT INTO wikistat WITH
    parseDateTimeBestEffort(extract(toLowCardinality(_path), 'pageviews-([\\d\\-]+)\\.gz$')) AS time,
    splitByChar(' ', line) AS values,
    splitByChar('.', values[1]) AS projects
SELECT
    time,
    projects[1] AS project,
    projects[2] AS subproject,
    values[2] AS path,
    CAST(values[3], 'UInt64') AS hits
FROM s3('https://....s3.eu-central-1.amazonaws.com/wikistat/original/*.gz', '...', '...', LineAsString, auto)
WHERE length(values) >= 3
```

Although this query does:

```
WITH
    parseDateTimeBestEffort(extract(toLowCardinality(_path), 'pageviews-([\\d\\-]+)\\.gz$')) AS time,
    splitByChar(' ', line) AS values,
    splitByChar('.', values[1]) AS projects
SELECT
    time,
    projects[1] AS project,
    projects[2] AS subproject,
    values[2] AS path,
    CAST(values[3], 'UInt64') AS hits
FROM s3('https://....s3.eu-central-1.amazonaws.com/wikistat/original/*.gz', '...', '...', LineAsString, auto)
WHERE length(values) >= 3
```

I also was not able to cancel the first query.
{
public:
    Impl(ContextPtr context_, const String & uri)
    {
        const auto [path_from_uri, uri_without_path] = getPathFromUriAndUriWithoutPath(uri);
        uris = getPathsList(path_from_uri, uri_without_path, context_);
        for (auto & elem : uris)
            elem = uri_without_path + elem;
        uris_iter = uris.begin();
    }
    String next()
    {
        std::lock_guard lock(mutex);
        if (uris_iter != uris.end())
        {
            auto answer = *uris_iter;
            ++uris_iter;
            return answer;
        }
        return {};
    }
private:
    std::mutex mutex;
    Strings uris;
    Strings::iterator uris_iter;
};
class HDFSSource::URISIterator::Impl