alamb opened a new issue, #9217:
URL: https://github.com/apache/arrow-datafusion/issues/9217
The newly added `to_char`'s null handling is not quite correct --
specifically when the format string is null, the output should be null, but now
it returns the first argument
Goal is to make `to_char` do what postgres does:
Postgres seems to think this should be null
```sql
postgres=# select to_char(interval '1 day', null);
to_char
---------
(1 row)
```
_Originally posted by @alamb in
https://github.com/apache/arrow-datafusion/pull/9181#discussion_r1487974457_
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