Deprecate scalar_at for execute_scalar

Signed-off-by: Nicholas Gates <nick@nickgates.com>

Author: gatesn

vortex-array/src/arrays/dict/compute/cast.rs

@@ -167,20 +167,9 @@ mod tests {
             &DType::Primitive(PType::I32, Nullability::NonNullable)
         );
 
-        // Check that both codes and values are NonNullable again
-        let back_dict = back_to_non_nullable.as_::<Dict>();
-        assert_eq!(
-            back_dict.codes().dtype().nullability(),
-            Nullability::NonNullable
-        );
-        assert_eq!(
-            back_dict.values().dtype().nullability(),
-            Nullability::NonNullable
-        );
-
         // Verify values are unchanged
         let original_values = dict.as_array().to_primitive();
-        let final_values = back_dict.array().to_primitive();
+        let final_values = back_to_non_nullable.to_primitive();
         assert_arrays_eq!(original_values, final_values);
     }