fix: date_trunc bench broken by #15049 (#15169)

Closes #15167

Author: Blizzara

datafusion/functions/benches/date_trunc.rs

@@ -46,11 +46,14 @@ fn criterion_benchmark(c: &mut Criterion) {
             ColumnarValue::Scalar(ScalarValue::Utf8(Some("minute".to_string())));
         let timestamps = ColumnarValue::Array(timestamps_array);
         let udf = date_trunc();
-        let return_type = &udf.return_type(&[timestamps.data_type()]).unwrap();
+        let args = vec![precision, timestamps];
+        let return_type = &udf
+            .return_type(&args.iter().map(|arg| arg.data_type()).collect::<Vec<_>>())
+            .unwrap();
         b.iter(|| {
             black_box(
                 udf.invoke_with_args(ScalarFunctionArgs {
-                    args: vec![precision.clone(), timestamps.clone()],
+                    args: args.clone(),
                     number_rows: batch_len,
                     return_type,
                 })