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

default_stage = QueryProcessingStage::WithMergeableStateAfterAggregationAndLimit;
    const auto & select = query_info.query->as<ASTSelectQuery &>();
    auto expr_contains_sharding_key = [&](const auto & exprs) -> bool
    {
        std::unordered_set<std::string> expr_columns;
        for (auto & expr : exprs)
        {
            auto id = expr->template as<ASTIdentifier>();
            if (!id)
                continue;
            expr_columns.emplace(id->name());
        }
        for (const auto & column : sharding_key_expr->getRequiredColumns())
        {
            if (!expr_columns.contains(column))
                return false;
        }
        return true;
    };
    
    
    
    if (select.group_by_with_totals || select.group_by_with_rollup || select.group_by_with_cube)
        return {};
    
    if (query_info.has_window)
        return {};
    
    if (settings.extremes)
        return {};