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:
    explicit Impl(const std::vector<const String> & uris_, ContextPtr context)
    {
        auto path_and_uri = getPathFromUriAndUriWithoutPath(uris_[0]);
        HDFSBuilderWrapper builder = createHDFSBuilder(path_and_uri.second + "/", context->getGlobalContext()->getConfigRef());
        HDFSFSPtr fs = createHDFSFS(builder.get());
        for (const auto & uri : uris_)
        {
            path_and_uri = getPathFromUriAndUriWithoutPath(uri);
            if (!hdfsExists(fs.get(), path_and_uri.first.c_str()))
                uris.push_back(uri);
        }
        uris_iter = uris.begin();
    }
    String next()