diff --git a/datafusion/spark/src/function/bitwise/bitwise_not.rs b/datafusion/spark/src/function/bitwise/bitwise_not.rs
index 5f8cf36911f43..e7285d4804950 100644
--- a/datafusion/spark/src/function/bitwise/bitwise_not.rs
+++ b/datafusion/spark/src/function/bitwise/bitwise_not.rs
@@ -73,25 +73,11 @@ impl ScalarUDFImpl for SparkBitwiseNot {
     }
 
     fn return_field_from_args(&self, args: ReturnFieldArgs) -> Result<FieldRef> {
-        if args.arg_fields.len() != 1 {
-            return plan_err!("bitwise_not expects exactly 1 argument");
-        }
-
-        let input_field = &args.arg_fields[0];
-
-        let out_dt = input_field.data_type().clone();
-        let mut out_nullable = input_field.is_nullable();
-
-        let scalar_null_present = args
-            .scalar_arguments
-            .iter()
-            .any(|opt_s| opt_s.is_some_and(|sv| sv.is_null()));
-
-        if scalar_null_present {
-            out_nullable = true;
-        }
-
-        Ok(Arc::new(Field::new(self.name(), out_dt, out_nullable)))
+        Ok(Arc::new(Field::new(
+            self.name(),
+            args.arg_fields[0].data_type().clone(),
+            args.arg_fields[0].is_nullable(),
+        )))
     }
 
     fn invoke_with_args(&self, args: ScalarFunctionArgs) -> Result<ColumnarValue> {
@@ -196,32 +182,4 @@ mod tests {
         assert!(out_i64_null.is_nullable());
         assert_eq!(out_i64_null.data_type(), &DataType::Int64);
     }
-
-    #[test]
-    fn test_bitwise_not_nullability_with_null_scalar() -> Result<()> {
-        use arrow::datatypes::{DataType, Field};
-        use datafusion_common::ScalarValue;
-        use std::sync::Arc;
-
-        let func = SparkBitwiseNot::new();
-
-        let non_nullable: FieldRef = Arc::new(Field::new("col", DataType::Int32, false));
-
-        let out = func.return_field_from_args(ReturnFieldArgs {
-            arg_fields: &[Arc::clone(&non_nullable)],
-            scalar_arguments: &[None],
-        })?;
-        assert!(!out.is_nullable());
-        assert_eq!(out.data_type(), &DataType::Int32);
-
-        let null_scalar = ScalarValue::Int32(None);
-        let out_with_null_scalar = func.return_field_from_args(ReturnFieldArgs {
-            arg_fields: &[Arc::clone(&non_nullable)],
-            scalar_arguments: &[Some(&null_scalar)],
-        })?;
-        assert!(out_with_null_scalar.is_nullable());
-        assert_eq!(out_with_null_scalar.data_type(), &DataType::Int32);
-
-        Ok(())
-    }
 }
diff --git a/datafusion/spark/src/function/datetime/date_add.rs b/datafusion/spark/src/function/datetime/date_add.rs
index b176f51ae6b32..99fba0e40c870 100644
--- a/datafusion/spark/src/function/datetime/date_add.rs
+++ b/datafusion/spark/src/function/datetime/date_add.rs
@@ -83,12 +83,7 @@ impl ScalarUDFImpl for SparkDateAdd {
     }
 
     fn return_field_from_args(&self, args: ReturnFieldArgs) -> Result<FieldRef> {
-        let nullable = args.arg_fields.iter().any(|f| f.is_nullable())
-            || args
-                .scalar_arguments
-                .iter()
-                .any(|arg| matches!(arg, Some(sv) if sv.is_null()));
-
+        let nullable = args.arg_fields.iter().any(|f| f.is_nullable());
         Ok(Arc::new(Field::new(
             self.name(),
             DataType::Date32,
@@ -155,7 +150,6 @@ fn spark_date_add(args: &[ArrayRef]) -> Result<ArrayRef> {
 mod tests {
     use super::*;
     use arrow::datatypes::Field;
-    use datafusion_common::ScalarValue;
 
     #[test]
     fn test_date_add_non_nullable_inputs() {
@@ -194,25 +188,4 @@ mod tests {
         assert_eq!(ret_field.data_type(), &DataType::Date32);
         assert!(ret_field.is_nullable());
     }
-
-    #[test]
-    fn test_date_add_null_scalar() {
-        let func = SparkDateAdd::new();
-        let args = &[
-            Arc::new(Field::new("date", DataType::Date32, false)),
-            Arc::new(Field::new("num", DataType::Int32, false)),
-        ];
-
-        let null_scalar = ScalarValue::Int32(None);
-
-        let ret_field = func
-            .return_field_from_args(ReturnFieldArgs {
-                arg_fields: args,
-                scalar_arguments: &[None, Some(&null_scalar)],
-            })
-            .unwrap();
-
-        assert_eq!(ret_field.data_type(), &DataType::Date32);
-        assert!(ret_field.is_nullable());
-    }
 }
diff --git a/datafusion/spark/src/function/datetime/date_sub.rs b/datafusion/spark/src/function/datetime/date_sub.rs
index 7e56670f17d22..49d2d97246d72 100644
--- a/datafusion/spark/src/function/datetime/date_sub.rs
+++ b/datafusion/spark/src/function/datetime/date_sub.rs
@@ -76,12 +76,7 @@ impl ScalarUDFImpl for SparkDateSub {
     }
 
     fn return_field_from_args(&self, args: ReturnFieldArgs) -> Result<FieldRef> {
-        let nullable = args.arg_fields.iter().any(|f| f.is_nullable())
-            || args
-                .scalar_arguments
-                .iter()
-                .any(|arg| matches!(arg, Some(sv) if sv.is_null()));
-
+        let nullable = args.arg_fields.iter().any(|f| f.is_nullable());
         Ok(Arc::new(Field::new(
             self.name(),
             DataType::Date32,
@@ -152,7 +147,6 @@ fn spark_date_sub(args: &[ArrayRef]) -> Result<ArrayRef> {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use datafusion_common::ScalarValue;
 
     #[test]
     fn test_date_sub_nullability_non_nullable_args() {
@@ -187,22 +181,4 @@ mod tests {
         assert!(result.is_nullable());
         assert_eq!(result.data_type(), &DataType::Date32);
     }
-
-    #[test]
-    fn test_date_sub_nullability_scalar_null_argument() {
-        let udf = SparkDateSub::new();
-        let date_field = Arc::new(Field::new("d", DataType::Date32, false));
-        let days_field = Arc::new(Field::new("n", DataType::Int32, false));
-        let null_scalar = ScalarValue::Int32(None);
-
-        let result = udf
-            .return_field_from_args(ReturnFieldArgs {
-                arg_fields: &[date_field, days_field],
-                scalar_arguments: &[None, Some(&null_scalar)],
-            })
-            .unwrap();
-
-        assert!(result.is_nullable());
-        assert_eq!(result.data_type(), &DataType::Date32);
-    }
 }