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

{
    if (!std::filesystem::exists(root_meta_path))
    {
        std::filesystem::create_directories(root_meta_path);
    }
    for (const auto & [inode, meta] : file_infos.meta_by_inode)
    {
        auto full_name = getFullMetaPath(meta.file_name);
        if (!std::filesystem::exists(full_name))
        {
            FS::createFile(full_name);
        }
        else
        {
            checkOffsetIsValid(full_name, meta.last_writen_position);
        }
        WriteBufferFromFile out(full_name);
        writeIntText(inode, out);
        writeChar('\n', out);
        writeIntText(meta.last_writen_position, out);
    }
}
void StorageFileLog::serialize(UInt64 inode, const FileMeta & file_meta) const