zjregee commented on issue #13670:
URL: https://github.com/apache/datafusion/issues/13670#issuecomment-2535300077
Hi, @comphead, I'm confused on how to handle the following situation, can
you give me some advice?
```rust
impl WindowUDFImpl for NthValue {
fn documentation(&self) -> Option<&Documentation> {
match self.kind {
NthValueKind::First => Some(get_first_value_doc()),
NthValueKind::Last => Some(get_last_value_doc()),
NthValueKind::Nth => Some(get_nth_value_doc()),
}
}
}
```
Taking `NthValue` as an example, it implements different window functions
through the enumeration value of its own type. How should I add `user_doc` for
it? Do I need to modify `user_doc` itself to support this scenario?
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