izveigor opened a new issue, #7028:
URL: https://github.com/apache/arrow-datafusion/issues/7028
### Describe the bug
The user @parkma99 first implemented the mechanism of operation of the
function `array_concat` with empty arrays. But current implementation does not
support nested empty arrays.
### To Reproduce
```
❯ select array_concat(make_array(make_array(1, 2), make_array(3, 4)),
make_array(make_array()));
+----------------------------------------------------------------------------------------------------------------+
|
array_concat(make_array(make_array(Int64(1),Int64(2)),make_array(Int64(3),Int64(4))),make_array(make_array()))
|
+----------------------------------------------------------------------------------------------------------------+
| [[1, 2], [3, 4], []]
|
+----------------------------------------------------------------------------------------------------------------+
```
### Expected behavior
```
❯ select array_concat(make_array(make_array(1, 2), make_array(3, 4)),
make_array(make_array()));
+----------------------------------------------------------------------------------------------------------------+
|
array_concat(make_array(make_array(Int64(1),Int64(2)),make_array(Int64(3),Int64(4))),make_array(make_array()))
|
+----------------------------------------------------------------------------------------------------------------+
| [[1, 2], [3, 4]]
|
+----------------------------------------------------------------------------------------------------------------+
```
The output should be similar to PostgreSQL.
PostgreSQL:
```
postgres=# select array_cat(array[array[1, 2], array[3, 4]],
array[array[]::integer[], array[]::integer[], array[]::integer[]]);
array_cat
---------------
{{1,2},{3,4}}
(1 row)
```
### Additional context
_No response_
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