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.
UInt64 max_single_read_retries_,
    const String compression_hint_,
    const std::shared_ptr<Aws::S3::S3Client> & client_,
    const String & bucket_,
    std::shared_ptr<IteratorWrapper> file_iterator_)
    : SourceWithProgress(getHeader(sample_block_, need_path, need_file))
    , WithContext(context_)
    , name(std::move(name_))
    , bucket(bucket_)
    , format(format_)
    , columns_desc(columns_)
    , max_block_size(max_block_size_)
    , max_single_read_retries(max_single_read_retries_)
    , compression_hint(compression_hint_)
    , client(client_)
    , sample_block(sample_block_)
    , format_settings(format_settings_)
    , with_file_column(need_file)
    , with_path_column(need_path)
    , file_iterator(file_iterator_)
{
    initialize();
}
void StorageS3Source::onCancel()
{
    std::lock_guard lock(reader_mutex);
    if (reader)
        reader->cancel();
}
bool StorageS3Source::initialize()