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

Reply via email to