Weston Pace created ARROW-12023:
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             Summary: Allow for AsyncGenerator<Future<>>
                 Key: ARROW-12023
                 URL: https://issues.apache.org/jira/browse/ARROW-12023
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Weston Pace
            Assignee: Weston Pace


Sometimes it's useful to do something like...

Collect(source.Map(x => table_builder.AddTable())

For example, in Scanner::ToTableAsync the table_building_task returns 
std::shared_ptr because we need something "iterable" currently.



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