Jefffrey commented on code in PR #19190:
URL: https://github.com/apache/datafusion/pull/19190#discussion_r2644513316
##########
datafusion/spark/src/function/string/format_string.rs:
##########
@@ -78,15 +78,17 @@ impl ScalarUDFImpl for FormatStringFunc {
&self.signature
}
- fn return_type(&self, arg_types: &[DataType]) -> Result<DataType> {
- match arg_types[0] {
- DataType::Null => Ok(DataType::Utf8),
- DataType::Utf8 | DataType::LargeUtf8 | DataType::Utf8View => {
- Ok(arg_types[0].clone())
- }
- _ => plan_err!(
- "The format_string function expects the first argument to be
Utf8, LargeUtf8 or Utf8View"
- ),
+ fn return_type(&self, _arg_types: &[DataType]) -> Result<DataType> {
+ datafusion_common::internal_err!(
+ "return_type should not be called, use return_field_from_args
instead"
+ )
+ }
+
+ fn return_field_from_args(&self, args: ReturnFieldArgs) ->
Result<FieldRef> {
+ match args.arg_fields[0].data_type() {
+ DataType::Null => Ok(Arc::new(Field::new("format_string",
DataType::Utf8, true))),
+ DataType::Utf8 | DataType::LargeUtf8 | DataType::Utf8View =>
Ok(Arc::clone(&args.arg_fields[0])),
+ _ => exec_err!("format_string expects the first argument to be
Utf8, LargeUtf8 or Utf8View, got {} instead", args.arg_fields[0].data_type())
}
Review Comment:
```rust
Ok(Arc::clone(&args.arg_fields[0]))
```
Is it possible to have a `DataType::Null` where the field isn't nullable? If
not we can simplify like so
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