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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/07/22 17:53:51 UTC
[GitHub] [arrow-rs] tustvold opened a new issue, #2136: Add TypedDictionaryArray
tustvold opened a new issue, #2136:
URL: https://github.com/apache/arrow-rs/issues/2136
**Is your feature request related to a problem or challenge? Please describe what you are trying to do.**
`DictionaryArray` does not know the type of its underlying child array, and therefore cannot implement `ArrayAccessor` directly.
**Describe the solution you'd like**
Introduce something like the following
```
pub struct TypedDictionaryArray<'a, K: ArrowDictionaryKeyType, T: ArrayAccessor> {
dict: &'a DictionaryArray<K>,
values: T
}
impl <'a, K: ArrowDictionaryKeyType, T: ArrayAccessor> ArrayAccessor for TypedDictionaryArray<'a, K, T> {
...
}
```
This will allow having standard implementations of kernels in terms of ArrayAccessor that will also work for DictionaryArray (once downcast to the appropriate type).
**Describe alternatives you've considered**
We could continue to special case the various different types of dictionary, using macros to reduce duplication
**Additional context**
#2135
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[GitHub] [arrow-rs] tustvold closed issue #2136: Add TypedDictionaryArray
Posted by GitBox <gi...@apache.org>.
tustvold closed issue #2136: Add TypedDictionaryArray
URL: https://github.com/apache/arrow-rs/issues/2136
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