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

{
    try
    {
        if (task)
        {
            task->stream_cancelled = true;
            
            wakeUp();
            LOG_TRACE(log, "Waiting for cleanup");
            task->holder->deactivate();
        }
        
        
        
        
    }
    catch (...)
    {
        tryLogCurrentException(__PRETTY_FUNCTION__);
        task->holder->deactivate();
    }
}
void StorageFileLog::assertStreamGood(const std::ifstream & reader)
{
    if (!reader.good())
    {
        throw Exception(ErrorCodes::CANNOT_READ_ALL_DATA, "Stream is in bad state");
    }
}
void StorageFileLog::openFilesAndSetPos()