alamb commented on code in PR #10899:
URL: https://github.com/apache/datafusion/pull/10899#discussion_r1638480860


##########
datafusion/functions/src/math/round.rs:
##########
@@ -128,29 +134,41 @@ pub fn round(args: &[ArrayRef]) -> Result<ArrayRef> {
                     }
                 )) as ArrayRef)
             }
-            ColumnarValue::Array(decimal_places) => 
Ok(Arc::new(make_function_inputs2!(
-                &args[0],
-                decimal_places,
-                "value",
-                "decimal_places",
-                Float64Array,
-                Int64Array,
-                {
-                    |value: f64, decimal_places: i64| {
-                        (value * 
10.0_f64.powi(decimal_places.try_into().unwrap()))
-                            .round()
-                            / 10.0_f64.powi(decimal_places.try_into().unwrap())
+            ColumnarValue::Array(_) => {
+                let ColumnarValue::Array(decimal_places) =
+                    decimal_places.cast_to(&Int32, None).map_err(|e| {
+                        exec_datafusion_err!("Invalid values for decimal 
places: {e}")
+                    })?
+                else {
+                    panic!("Unexpected result of ColumnarValue::Array.cast")

Review Comment:
   I think you can avoid the panic by collaspsing the two 
`ColumnarValue::Array` 
   
   So instead of
   
   ```rust
               ColumnarValue::Array(_) => {
      let ColumnarValue::Array(decimal_places) =
                       decimal_places.cast_to(&Int32, None).map_err(|e| {
                           exec_datafusion_err!("Invalid values for decimal 
places: {e}")
                       })?
                   else {
   ..
   ```
   
   ```rust
     ColumnarValue::Array(decimal_places) => { 
   ...
   ```



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