devanbenz commented on code in PR #12224:
URL: https://github.com/apache/datafusion/pull/12224#discussion_r1737586402
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datafusion/functions/src/string/concat.rs:
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@@ -64,13 +66,19 @@ impl ScalarUDFImpl for ConcatFunc {
&self.signature
}
- fn return_type(&self, _arg_types: &[DataType]) -> Result<DataType> {
- Ok(Utf8)
+ fn return_type(&self, arg_types: &[DataType]) -> Result<DataType> {
+ use DataType::*;
+ Ok(match &arg_types[0] {
+ Utf8View => Utf8View,
+ LargeUtf8 => LargeUtf8,
+ _ => Utf8,
+ })
Review Comment:
Ah yeah @findepi I think the logic is "Whatever the first argument type is
the output should be of that type" so if the received values were: Utf8,
Utf8View the output would be Utf8. I'm taking the logic from other UDFs and
applying it here. It may not be the best way of doing this though.
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