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

const Names & column_names,
    const StorageMetadataPtr & metadata_snapshot,
    SelectQueryInfo & query_info,
    ContextPtr context_,
    QueryProcessingStage::Enum ,
    size_t max_block_size,
    unsigned num_streams)
{
    HDFSBuilderWrapper builder = createHDFSBuilder(hdfs_namenode_url, context_->getGlobalContext()->getConfigRef());
    HDFSFSPtr fs = createHDFSFS(builder.get());
    auto hive_metastore_client = HiveMetastoreClientFactory::instance().getOrCreate(hive_metastore_url, getContext());
    auto hive_table_metadata = hive_metastore_client->getTableMetadata(hive_database, hive_table);
    std::vector<Apache::Hadoop::Hive::Partition> partitions = hive_table_metadata->getPartitions();
    
    HiveFiles hive_files;
    
    std::mutex hive_files_mutex;
    ThreadPool pool{num_streams};
    if (!partitions.empty())
    {
        for (const auto & partition : partitions)
        {
            pool.scheduleOrThrowOnError([&]()
            {