CREATE TABLE test(col1 INT, col2 INT2[][][][][][]);
INSERT INTO test VALUES(1000000000, null), (1000000001, [[[[[[]]]]]]), (null, [[[[[[]]]]]]), (null, [[[[[[]]]]]]), (1, [[[[[[]]]]]]);
SELECT col1, col2 FROM test ORDER BY col1 NULLS LAST, col2;

┌────────────┬───────────────────┐
│    col1    │       col2        │
│   int32    │ int16[][][][][][] │
├────────────┼───────────────────┤
│            │ [[[[[[]]]]]]      │
│            │ [[[[[[]]]]]]      │
│          1 │ [[[[[[]]]]]]      │
│ 1000000000 │                   │
│ 1000000001 │ [[[[[[]]]]]]      │
└────────────┴───────────────────┘