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https://issues.apache.org/jira/browse/ARROW-12286?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Li resolved ARROW-12286.
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Fix Version/s: 4.0.0
Resolution: Fixed
Issue resolved by pull request 9943
[https://github.com/apache/arrow/pull/9943]
> [C++] Create AsyncGenerator from Future<AsyncGenerator<T>>
> ----------------------------------------------------------
>
> Key: ARROW-12286
> URL: https://issues.apache.org/jira/browse/ARROW-12286
> Project: Apache Arrow
> Issue Type: Sub-task
> Components: C++
> Reporter: Weston Pace
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> This is useful for doing things like...
> Future<ItemVector> vec_fut = GetVectorOfThingsAsync();
> Future<AsyncGenerator<Item>> gen_fut = vec_fut.Then([] (const SomeVector&
> vec) \{ return MakeVectorGenerator(vec); };
> AsyncGenerator<Item> item_gen = MakeFutureFirstGenerator(gen_fut);
>
> The cost of the initial future is just part of the cost of getting the first
> item from the generator.
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