rluvaton commented on code in PR #19182:
URL: https://github.com/apache/datafusion/pull/19182#discussion_r2596537420
##########
datafusion/spark/src/function/string/length.rs:
##########
@@ -279,4 +286,38 @@ mod tests {
Ok(())
}
+
+ #[test]
+ fn test_spark_length_nullability() -> Result<()> {
+ let func = SparkLengthFunc::new();
+
+ let nullable_field: FieldRef =
+ Arc::new(Field::new("col", DataType::Utf8, true));
+
+ let out_nullable = func.return_field_from_args(ReturnFieldArgs {
+ arg_fields: &[nullable_field],
+ scalar_arguments: &[],
Review Comment:
there should be the same number of `scalar_arguments` and `arg_fields`, if
something is not scalar than None is used.
```suggestion
scalar_arguments: &[None],
```
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