viirya commented on code in PR #2680:
URL: https://github.com/apache/arrow-rs/pull/2680#discussion_r966255170
##########
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(_, _) => {
Review Comment:
Hmm, I agree that sorting the dictionary values and using it to compare the
keys might be faster. But does it help on combinatorial fanout from dictionary?
For example, in order to sort on the dictionary values, we still need get the
value array from dictionary array so a `downcast_dictionary_array!` is also
necessary.
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