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

{
    Stopwatch watch;
    auto table_id = getStorageID();
    auto table = DatabaseCatalog::instance().getTable(table_id, getContext());
    if (!table)
        throw Exception("Engine table " + table_id.getNameForLogs() + " doesn't exist.", ErrorCodes::LOGICAL_ERROR);
    auto metadata_snapshot = getInMemoryMetadataPtr();
    
    auto insert = std::make_shared<ASTInsertQuery>();
    insert->table_id = table_id;
    size_t block_size = getMaxBlockSize();
    auto kafka_context = Context::createCopy(getContext());
    kafka_context->makeQueryContext();
    kafka_context->applySettingsChanges(settings_adjustments);
    
    
    InterpreterInsertQuery interpreter(insert, kafka_context, false, true, true);
    auto block_io = interpreter.execute();
    
    std::vector<std::shared_ptr<KafkaSource>> sources;
    Pipes pipes;
    auto stream_count = thread_per_consumer ? 1 : num_created_consumers;
    sources.reserve(stream_count);
    pipes.reserve(stream_count);
    for (size_t i = 0; i < stream_count; ++i)
    {
        auto source = std::make_shared<KafkaSource>(*this, metadata_snapshot, kafka_context, block_io.pipeline.getHeader().getNames(), log, block_size, false);
        sources.emplace_back(source);
        pipes.emplace_back(source);