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

{
    current_path = (*file_iterator)();
    if (current_path.empty())
        return false;
    const auto [path_from_uri, uri_without_path] = getPathFromUriAndUriWithoutPath(current_path);
    auto compression = chooseCompressionMethod(path_from_uri, storage->compression_method);
    read_buf = wrapReadBufferWithCompressionMethod(std::make_unique<ReadBufferFromHDFS>(uri_without_path, path_from_uri, getContext()->getGlobalContext()->getConfigRef()), compression);
    auto get_block_for_format = [&]() -> Block
    {
        if (storage->isColumnOriented())
            return metadata_snapshot->getSampleBlockForColumns(columns_description.getNamesOfPhysical());
        return metadata_snapshot->getSampleBlock();
    };
    auto input_format = getContext()->getInputFormat(storage->format_name, *read_buf, get_block_for_format(), max_block_size);
    QueryPipelineBuilder builder;
    builder.init(Pipe(input_format));
    if (columns_description.hasDefaults())
    {
        builder.addSimpleTransform([&](const Block & header)
        {
            return std::make_shared<AddingDefaultsTransform>(header, columns_description, *input_format, getContext());
        });
    }
    pipeline = std::make_unique<QueryPipeline>(QueryPipelineBuilder::getPipeline(std::move(builder)));
    reader = std::make_unique<PullingPipelineExecutor>(*pipeline);
    return true;
}
String HDFSSource::getName() const