jayzhan211 opened a new issue, #9394:
URL: https://github.com/apache/arrow-datafusion/issues/9394
The syntax is like `select * from unnest(), unnest(), table;`
```
postgres=# select * from unnest(ARRAY[1,2,3]), unnest(ARRAY[4,5]) as b2, t1;
unnest | b2 | a
--------+----+---------
1 | 4 | {1,2,3}
2 | 4 | {1,2,3}
3 | 4 | {1,2,3}
1 | 5 | {1,2,3}
2 | 5 | {1,2,3}
3 | 5 | {1,2,3}
1 | 4 | {4,5}
2 | 4 | {4,5}
3 | 4 | {4,5}
1 | 5 | {4,5}
2 | 5 | {4,5}
3 | 5 | {4,5}
(12 rows)
```
Similar for Duckdb, a is [1,2,3] and [10, 20]
```
D select * from unnest([1,2,3]), unnest([4,5]) as b2, t1;
┌──────────────────────────┬───────────────────────┬───────────┐
│ main.list_value(1, 2, 3) │ main.list_value(4, 5) │ a │
│ int32 │ int32 │ int32[] │
├──────────────────────────┼───────────────────────┼───────────┤
│ 1 │ 4 │ [1, 2, 3] │
│ 2 │ 4 │ [1, 2, 3] │
│ 3 │ 4 │ [1, 2, 3] │
│ 1 │ 5 │ [1, 2, 3] │
│ 2 │ 5 │ [1, 2, 3] │
│ 3 │ 5 │ [1, 2, 3] │
│ 1 │ 4 │ [10, 20] │
│ 2 │ 4 │ [10, 20] │
│ 3 │ 4 │ [10, 20] │
│ 1 │ 5 │ [10, 20] │
│ 2 │ 5 │ [10, 20] │
│ 3 │ 5 │ [10, 20] │
├──────────────────────────┴───────────────────────┴───────────┤
│ 12 rows 3 columns │
└──────────────────────────────────────────────────────────────┘
```
In datafusion, we have the similar result but the ordering is different. I
think we should understand the reason of the different ordering in cross join.
_Originally posted by @jayzhan211 in
https://github.com/apache/arrow-datafusion/pull/9355#discussion_r1505255606_
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