westonpace commented on a change in pull request #11294:
URL: https://github.com/apache/arrow/pull/11294#discussion_r731321783
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File path: cpp/src/arrow/util/async_generator.h
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@@ -1156,6 +1176,23 @@ AsyncGenerator<T>
MakeMergedGenerator(AsyncGenerator<AsyncGenerator<T>> source,
return MergedGenerator<T>(std::move(source), max_subscriptions);
}
+template <typename T>
+Result<AsyncGenerator<T>> MakeSequencedMergedGenerator(
Review comment:
Yes. After implementing it I realized it may be a bit of a premature
optimization (we could probably just use a concatenated generator) but it will
do exactly as you describe. So it has a slight advantage over the concatenated
generator in that it "primes" future generators even if it doesn't start
reading from them.
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