Thankfully "partial merge join" is disabled by default.

```
milovidov-desktop :) SET max_block_size = 6, join_algorithm = 'partial_merge'

SET max_block_size = 6, join_algorithm = 'partial_merge'

Query id: 600704b7-b455-4726-8a9c-8e45b509f2fb

Ok.

0 rows in set. Elapsed: 0.002 sec. 

milovidov-desktop :) SELECT blockSize() bs FROM (SELECT 1 s) js1 ALL RIGHT JOIN (SELECT arrayJoin([2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3]) s) js2 USING (s) GROUP BY bs ORDER BY bs;

SELECT blockSize() AS bs
FROM
(
    SELECT 1 AS s
) AS js1
ALL RIGHT JOIN
(
    SELECT arrayJoin([2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3]) AS s
) AS js2 USING (s)
GROUP BY bs
ORDER BY bs ASC

Query id: ae51c589-4b69-4e90-a3a9-7ef4ead72af9

→ Progress: 2.00 rows, 2.00 B (18.21 rows/s., 18.21 B/s.)
```

Found by stress test.
}
    return one_more;
}
template <bool copy_left>
void joinInequalsLeft(const Block & left_block, MutableColumns & left_columns,
                      const Block & right_block, MutableColumns & right_columns,
                      size_t start, size_t end)
{
    if (end <= start)
        return;
    size_t rows_to_add = end - start;
    if constexpr (copy_left)
        copyLeftRange(left_block, left_columns, start, rows_to_add);
    for (size_t i = 0; i < right_columns.size(); ++i)
    {
        JoinCommon::addDefaultValues(*right_columns[i], right_block.getByPosition(i).type, rows_to_add);
    }
}
}
MergeJoin::MergeJoin(std::shared_ptr<TableJoin> table_join_, const Block & right_sample_block_)
    : table_join(table_join_)
    , size_limits(table_join->sizeLimits())
    , right_sample_block(right_sample_block_)
    , nullable_right_side(table_join->forceNullableRight())
    , nullable_left_side(table_join->forceNullableLeft())
    , is_any_join(table_join->strictness() == ASTTableJoin::Strictness::Any)
    , is_all_join(table_join->strictness() == ASTTableJoin::Strictness::All)
    , is_semi_join(table_join->strictness() == ASTTableJoin::Strictness::Semi)
    , is_inner(isInner(table_join->kind()))
    , is_left(isLeft(table_join->kind()))