SET max_rows_to_read = 100, max_block_size = 24, read_overflow_mode = 'break', max_threads = 32;

Ok.

0 rows in set. Elapsed: 0.001 sec. 

SELECT 
    blockNumber() AS b, 
    count()
FROM system.numbers_mt
GROUP BY b
    WITH TOTALS

┌──b─┬─count()─┐
│ 36 │      24 │
│ 35 │      24 │
│ 34 │      24 │
│ 33 │      24 │
└────┴─────────┘

Totals:
┌─b─┬─count()─┐
│ 0 │      96 │
└───┴─────────┘

4 rows in set. Elapsed: 0.006 sec.