westonpace commented on a change in pull request #11145:
URL: https://github.com/apache/arrow/pull/11145#discussion_r707772288
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File path: cpp/src/arrow/util/async_generator.h
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@@ -1611,4 +1611,48 @@ AsyncGenerator<T> MakeCancellable(AsyncGenerator<T>
source, StopToken stop_token
return CancellableGenerator<T>{std::move(source), std::move(stop_token)};
}
+template <typename T>
+class OrGenerator {
Review comment:
RxJS calls this
[defaultIfEmpty](https://www.learnrxjs.io/learn-rxjs/operators/conditional/defaultifempty)
which is a bit more explicit. My first thought when I see OrGenerator would
be something like... `AsyncGenerator<X>(AsyncGenerator<optional<X>>, X default)`
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