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

}
SinkToStoragePtr StorageKafka::write(const ASTPtr &, const StorageMetadataPtr & metadata_snapshot, ContextPtr local_context)
{
    auto modified_context = Context::createCopy(local_context);
    modified_context->applySettingsChanges(settings_adjustments);
    if (topics.size() > 1)
        throw Exception("Can't write to Kafka table with multiple topics!", ErrorCodes::NOT_IMPLEMENTED);
    return std::make_shared<KafkaSink>(*this, metadata_snapshot, modified_context);
}
void StorageKafka::startup()
{
    for (size_t i = 0; i < num_consumers; ++i)
    {
        try
        {
            pushReadBuffer(createReadBuffer(i));
            ++num_created_consumers;
        }
        catch (const cppkafka::Exception &)
        {
            tryLogCurrentException(log);
        }
    }
    
    for (auto & task : tasks)
    {
        task->holder->activateAndSchedule();
    }
}
void StorageKafka::shutdown()