Omega359 opened a new issue, #13384:
URL: https://github.com/apache/datafusion/issues/13384
### Describe the bug
The array_to_string function has an optional third argument `null_string`
that if provided will replace null. This is tested in the slt tests:
```
# array_to_string scalar function with nulls #2
query TTT
select array_to_string(make_array('h', NULL, NULL, NULL, 'o'), ',', '-'),
array_to_string(make_array(NULL, 2, NULL, 4, 5), '-', 'nil'),
array_to_string(make_array(1.0, NULL, 3.0), '|', '0');
----
h,-,-,-,o nil-2-nil-4-5 1|0|3
```
### To Reproduce
_No response_
### Expected behavior
Docs should reflect the actual functionality.
### Additional context
_No response_
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