tlm365 opened a new issue, #13711:
URL: https://github.com/apache/datafusion/issues/13711
### Is your feature request related to a problem or challenge?
Make `initcap` function work with Unicode character.
### Describe the solution you'd like
Current behavior of DataFusion:
```sql
select initcap('đẹp đẽ êm ả édouard'); --đẹP đẽ êM ả éDouard
select initcap('ñandú árbol éxito'); --ñAndú áRbol éXito
select initcap('олег иванович'); --олег иванович
select initcap('íslensku þjóðarinnar'); --íSlensku þJóðArinnar
select initcap('ελληνική επιστήμη'); --ελληνική επιστήμη
```
Expected behavior: (Postgres)
```sql
select initcap('đẹp đẽ êm ả édouard'); --Đẹp Đẽ Êm Ả Édouard
select initcap('ñandú árbol éxito'); --Ñandú Árbol Éxito
select initcap('олег иванович'); --Олег Иванович
select initcap('íslensku þjóðarinnar'); --Íslensku Þjóðarinnar
select initcap('ελληνική επιστήμη'); --Ελληνική Επιστήμη
```
### Describe alternatives you've considered
_No response_
### Additional context
Found in
[comment](https://github.com/apache/datafusion/pull/13691#discussion_r1875885799)
of @Dandandan
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