Weston Pace created ARROW-10185:
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Summary: Add FinishAsync to TaskGroup
Key: ARROW-10185
URL: https://issues.apache.org/jira/browse/ARROW-10185
Project: Apache Arrow
Issue Type: Sub-task
Reporter: Weston Pace
As an alternative to Finish, FinishAsync will return a future immediately.
This can then be added to a parent task group, allowing for nested task groups.
Since the future is returned immediately, the child task group is not
occupying a thread on the thread pool and there is no concern for thread
starvation.
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