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.
const StorageHDFSPtr & storage,
    const StorageMetadataPtr & metadata_snapshot,
    const ColumnsDescription & columns_description,
    bool need_path_column,
    bool need_file_column)
{
    if (storage->isColumnOriented())
        return metadata_snapshot->getSampleBlockForColumns(
            columns_description.getNamesOfPhysical(), storage->getVirtuals(), storage->getStorageID());
    else
        return getHeader(metadata_snapshot, need_path_column, need_file_column);
}
HDFSSource::DisclosedGlobIterator::DisclosedGlobIterator(ContextPtr context_, const String & uri)
    : pimpl(std::make_shared<HDFSSource::DisclosedGlobIterator::Impl>(context_, uri)) {}
String HDFSSource::DisclosedGlobIterator::next()
{
    return pimpl->next();
}
HDFSSource::URISIterator::URISIterator(const std::vector<const String> & uris_, ContextPtr context)
    : pimpl(std::make_shared<HDFSSource::URISIterator::Impl>(uris_, context))
{
}
String HDFSSource::URISIterator::next()
{
    return pimpl->next();
}
HDFSSource::HDFSSource(