[jira] [Updated] (ARROW-12286) [C++] Create AsyncGenerator from Future>

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-12286?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated ARROW-12286:
-----------------------------------
    Labels: pull-request-available  (was: )

> [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
>          Time Spent: 10m
>  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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