findepi commented on PR #14668:
URL: https://github.com/apache/datafusion/pull/14668#issuecomment-2666294942
Added support for out types:
```rust
#[excalibur_function]
fn concat(a: &str, b: &str, out: &mut impl std::fmt::Write) ->
Result<ValuePresence> {
if a.is_empty() && b.is_empty() {
// Be like Oracle
return Ok(ValuePresence::Null);
}
out.write_str(a)?;
out.write_str(b)?;
Ok(ValuePresence::Value)
}
```
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