tustvold commented on code in PR #2680:
URL: https://github.com/apache/arrow-rs/pull/2680#discussion_r966256276
##########
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:
I don't think so, you could call sort_to_indices on the values array, which
is only typed on the values type, and then to compare dictionary values you
compare the indices you just computed, which is only typed on the dictionary
key type. You therefore avoid the fanout?
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