alamb commented on code in PR #2636:
URL: https://github.com/apache/arrow-rs/pull/2636#discussion_r962144419
##########
arrow/src/array/cast.rs:
##########
@@ -53,6 +260,90 @@ where
.expect("Unable to downcast to primitive array")
}
+/// Downcast an [`Array`] to a [`DictionaryArray`] based on its [`DataType`],
accepts
+/// a number of subsequent patterns to match the data type
+///
+/// ```
+/// # use arrow::downcast_dict_array;
+/// # use arrow::array::Array;
+/// # use arrow::datatypes::DataType;
+/// # use arrow::array::as_string_array;
+///
+/// fn print_keys(array: &dyn Array) {
+/// downcast_dict_array!(
+/// array => {
+/// for v in array.keys() {
+/// println!("{:?}", v);
+/// }
+/// }
+/// t => println!("Unsupported datatype {}", t)
Review Comment:
🥘 👍
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