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

serialize();
}
void StorageFileLog::closeFilesAndStoreMeta(size_t start, size_t end)
{
    assert(start < end);
    assert(end <= file_infos.file_names.size());
    for (size_t i = start; i < end; ++i)
    {
        auto & file_ctx = findInMap(file_infos.context_by_name, file_infos.file_names[i]);
        if (file_ctx.reader)
        {
            if (file_ctx.reader->is_open())
                file_ctx.reader->close();
        }
        auto & meta = findInMap(file_infos.meta_by_inode, file_ctx.inode);
        serialize(file_ctx.inode, meta);
    }
}
void StorageFileLog::storeMetas(size_t start, size_t end)
{
    assert(start < end);
    assert(end <= file_infos.file_names.size());
    for (size_t i = start; i < end; ++i)
    {
        auto & file_ctx = findInMap(file_infos.context_by_name, file_infos.file_names[i]);
        auto & meta = findInMap(file_infos.meta_by_inode, file_ctx.inode);
        serialize(file_ctx.inode, meta);
    }
}
void StorageFileLog::checkOffsetIsValid(const String & full_name, UInt64 offset)