Jörn Horstmann created ARROW-8383: ------------------------------------- Summary: [RUST] Easier random access to DictionaryArray keys and values Key: ARROW-8383 URL: https://issues.apache.org/jira/browse/ARROW-8383 Project: Apache Arrow Issue Type: Improvement Components: Rust Reporter: Jörn Horstmann
Currently it's not that clear how to acces DictionaryArray keys and values using random indices. The `DictionaryArray::keys` method exposes an Iterator with an `nth` method, but this requires a mut reference and feels a little bit out of place compared to other methods of accessing arrow data. Another alternative seems to be to use the `From<ArrayDataRef> for PrimitiveArray<T>` conversion like so `let keys : Int16Array = dictionary_array.data().into()`. This seems to work fine but is not easily discoverable and also needs to be done outside of any loops for performance reasons. I'd like methods on `DictionaryArray` to directly get the key at some index ``` pub fn key(&self, i: usize) -> &K ``` Ideally I'd also like an easier way to directly access values at some index, at least when those are primitive or string types. ``` pub fn value(&self, i: usize) -> &T ``` I'm not sure how or if that would be possible to implement with rust generics. -- This message was sent by Atlassian Jira (v8.3.4#803005)