[jira] [Created] (ARROW-12287) [C++] Create enumerating future

[Weston Pace (Jira)]

Weston Pace created ARROW-12287:
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             Summary: [C++] Create enumerating future
                 Key: ARROW-12287
                 URL: https://issues.apache.org/jira/browse/ARROW-12287
             Project: Apache Arrow
          Issue Type: Sub-task
          Components: C++
            Reporter: Weston Pace


With parallel readahead items may get returned out of order.  An enumerating 
future can be used to tag items prior to the parallel readahead so that they 
can later be reassembled.



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