```
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] [                                                                                                                                                                                                                                        <=>               ]
```

{
    String current_key = (*file_iterator)();
    if (current_key.empty())
        return false;
    file_path = fs::path(bucket) / current_key;
    read_buf = wrapReadBufferWithCompressionMethod(
        std::make_unique<ReadBufferFromS3>(client, bucket, current_key, max_single_read_retries, getContext()->getReadSettings()),
        chooseCompressionMethod(current_key, compression_hint));
    auto input_format = getContext()->getInputFormat(format, *read_buf, sample_block, max_block_size, format_settings);
    QueryPipelineBuilder builder;
    builder.init(Pipe(input_format));
    if (columns_desc.hasDefaults())
    {
        builder.addSimpleTransform([&](const Block & header)
        {
            return std::make_shared<AddingDefaultsTransform>(header, columns_desc, *input_format, getContext());
        });
    }
    pipeline = std::make_unique<QueryPipeline>(QueryPipelineBuilder::getPipeline(std::move(builder)));
    reader = std::make_unique<PullingPipelineExecutor>(*pipeline);
    initialized = false;
    return true;
}
String StorageS3Source::getName() const
{
    return name;
}
Chunk StorageS3Source::generate()