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

{
    std::lock_guard<std::mutex> lock(file_infos_mutex);
    if (running_streams)
    {
        LOG_INFO(log, "Another select query is running on this table, need to wait it finish.");
        return true;
    }
    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 max_streams_number = std::min<UInt64>(filelog_settings->max_threads.value, file_infos.file_names.size());
    
    if (max_streams_number == 0)
    {
        LOG_INFO(log, "There is a idle table named {}, no files need to parse.", getName());
        return updateFileInfos();
    }
    
    auto insert = std::make_shared<ASTInsertQuery>();
    insert->table_id = table_id;
    auto new_context = Context::createCopy(getContext());
    InterpreterInsertQuery interpreter(insert, new_context, false, true, true);
    auto block_io = interpreter.execute();