```
ubuntu@ip-172-31-79-147:/opt/downloads$ clickhouse-local --max_threads 8 --query "WITH parseDateTimeBestEffort(extract(_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, (values[3])::UInt64 AS hits FROM file('pageviews*.gz', LineAsString) WHERE length(values) >= 3" | pv > /dev/null
^C01GiB 0:01:08 [ 129MiB/s] [                                                                                                                                                                   <=>                                                                                    ]

ubuntu@ip-172-31-79-147:/opt/downloads$ clickhouse-local --max_threads 8 --query "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, (values[3])::UInt64 AS hits FROM file('pageviews*.gz', LineAsString) WHERE length(values) >= 3" | pv > /dev/null
^C46GiB 0:00:48 [ 175MiB/s] [                                                                                                                                                                                                                                        <=>               ]
```

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()