viirya commented on code in PR #1990:
URL: https://github.com/apache/arrow-rs/pull/1990#discussion_r915171084
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arrow/src/compute/kernels/arity.rs:
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@@ -103,8 +103,22 @@ where
.collect::<PrimitiveArray<T>>();
let keys = array.keys();
- let new_dict = DictionaryArray::<K>::try_new(keys, &values).unwrap();
+ let mut data = ArrayData::builder(array.data_type().clone())
Review Comment:
I thought about it. I think for mostly usage in query execution,
input/output types are the same for `unary`. A difficulty to specify output
type for `unary_dict` is, unlike `unary` where we can bind output type on the
produced `PrimitiveArray<O>` and `F: Fn(T::Native) -> T::Native`. In
`unary_dict`, the output type `O` cannot be bound on the produce dictionary
array. So the compiler cannot infer it. Then we need to specify `O` when
invoking `unary_dict`/`unary_dyn`. I feel it is harder to use. So if we only
use it for same input/output types, I just leave it without a separate output
type parameter.
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