numbers_mt
The same as system.numbers but reads are parallelized. The numbers can be returned in any order.
Used for tests.
Example
SELECT * FROM system.numbers_mt LIMIT 10;
┌─number─┐
│      0 │
│      1 │
│      2 │
│      3 │
│      4 │
│      5 │
│      6 │
│      7 │
│      8 │
│      9 │
└────────┘
10 rows in set. Elapsed: 0.001 sec.