devanbenz commented on code in PR #12224: URL: https://github.com/apache/datafusion/pull/12224#discussion_r1737404565
########## datafusion/functions/src/string/concat.rs: ########## @@ -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, + }) } /// Concatenates the text representations of all the arguments. NULL arguments are ignored. /// concat('abcde', 2, NULL, 22) = 'abcde222' fn invoke(&self, args: &[ColumnarValue]) -> Result<ColumnarValue> { + let args_datatype = args[0].data_type(); Review Comment: The concat function does not support zero arguments For the second point yeah I can change that -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: github-unsubscr...@datafusion.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: github-unsubscr...@datafusion.apache.org For additional commands, e-mail: github-h...@datafusion.apache.org