neilconway opened a new issue, #20535:
URL: https://github.com/apache/datafusion/issues/20535
### Describe the bug
```
> CREATE TABLE test_null_str AS VALUES
(make_array(1, NULL, 3), ',', 'N/A'),
(make_array(NULL, 5, NULL), ',', 'MISSING');
0 row(s) fetched.
Elapsed 0.101 seconds.
> SELECT array_to_string(column1, column2, column3) FROM test_null_str;
+------------------------------------------------------------------------------------+
|
array_to_string(test_null_str.column1,test_null_str.column2,test_null_str.column3)
|
+------------------------------------------------------------------------------------+
| 1,N/A,3
|
| N/A,5,N/A
|
+------------------------------------------------------------------------------------+
2 row(s) fetched.
Elapsed 0.024 seconds.
```
We incorrectly use the `null_string` value for row 1 for all the remaining
rows -- should be "MISSING" not "N/A" in row 2.
### To Reproduce
_No response_
### Expected behavior
_No response_
### Additional context
_No response_
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