viirya commented on code in PR #2680:
URL: https://github.com/apache/arrow-rs/pull/2680#discussion_r965607828


##########
arrow/src/compute/kernels/sort.rs:
##########
@@ -311,41 +312,26 @@ pub fn sort_to_indices(
                 )));
             }
         },
-        DataType::Dictionary(key_type, value_type)
-            if *value_type.as_ref() == DataType::Utf8 =>
-        {
-            match key_type.as_ref() {
-                DataType::Int8 => {
-                    sort_string_dictionary::<Int8Type>(values, v, n, &options, 
limit)
-                }
-                DataType::Int16 => {
-                    sort_string_dictionary::<Int16Type>(values, v, n, 
&options, limit)
-                }
-                DataType::Int32 => {
-                    sort_string_dictionary::<Int32Type>(values, v, n, 
&options, limit)
-                }
-                DataType::Int64 => {
-                    sort_string_dictionary::<Int64Type>(values, v, n, 
&options, limit)
-                }
-                DataType::UInt8 => {
-                    sort_string_dictionary::<UInt8Type>(values, v, n, 
&options, limit)
-                }
-                DataType::UInt16 => {
-                    sort_string_dictionary::<UInt16Type>(values, v, n, 
&options, limit)
-                }
-                DataType::UInt32 => {
-                    sort_string_dictionary::<UInt32Type>(values, v, n, 
&options, limit)
-                }
-                DataType::UInt64 => {
-                    sort_string_dictionary::<UInt64Type>(values, v, n, 
&options, limit)
-                }
-                t => {
-                    return Err(ArrowError::ComputeError(format!(
-                        "Sort not supported for dictionary key type {:?}",
-                        t
-                    )));
-                }
-            }
+        DataType::Dictionary(_, _) => {
+            downcast_dictionary_array!(
+                values => match values.values().data_type() {
+                    DataType::Int8 => sort_primitive_dictionary::<_, Int8Type, 
_>(values, v, n, &options, limit, cmp),

Review Comment:
   For other primitive types, we just need to add other patterns and call 
`sort_primitive_dictionary` with different parameters.
   
   I will add them in separate PRs.



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