Function arrow_array::cast::as_dictionary_array

pub fn as_dictionary_array<T>(arr: &dyn Array) -> &DictionaryArray<T>
where
    T: ArrowDictionaryKeyType,

Force downcast of an Array, such as an ArrayRef to DictionaryArray<T>, panic’ing on failure.

Example

let arr: DictionaryArray<Int32Type> = vec![Some("foo")].into_iter().collect();
let arr: ArrayRef = std::sync::Arc::new(arr);
let dict_array: &DictionaryArray<Int32Type> = as_dictionary_array::<Int32Type>(&arr);