tustvold commented on a change in pull request #1082:
URL: https://github.com/apache/arrow-rs/pull/1082#discussion_r785498869



##########
File path: parquet/benches/arrow_array_reader.rs
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@@ -273,7 +274,7 @@ fn build_dictionary_encoded_string_page_iterator(
     InMemoryPageIterator::new(schema, column_desc, pages)
 }
 
-fn bench_array_reader(mut array_reader: impl ArrayReader) -> usize {
+fn bench_array_reader(mut array_reader: Box<dyn ArrayReader>) -> usize {

Review comment:
       This change is necessary because byte_array_reader hides its 
implementing type, this is both to make the API more ergonomic for clients and 
also to aid future crate evolution




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