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

ASTSelectQuery & select_query = modified_query_ast->as<ASTSelectQuery &>();
    
    
    
    select_query.setExpression(ASTSelectQuery::Expression::SETTINGS, {});
    if (table_function_ptr)
        select_query.addTableFunction(table_function_ptr);
    else
        select_query.replaceDatabaseAndTable(remote_database, remote_table);
    
    
    if (!table_function_ptr)
    {
        RestoreQualifiedNamesVisitor::Data data;
        data.distributed_table = DatabaseAndTableWithAlias(*getTableExpression(query->as<ASTSelectQuery &>(), 0));
        data.remote_table.database = remote_database;
        data.remote_table.table = remote_table;
        RestoreQualifiedNamesVisitor(data).visit(modified_query_ast);
    }
    
    
    
    
    AddDefaultDatabaseVisitor visitor(context, context->getCurrentDatabase(),
        false,
        true);
    visitor.visit(modified_query_ast);
    return modified_query_ast;
}
UInt64 getMaximumFileNumber(const std::string & dir_path)