Weston Pace created ARROW-12091:
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Summary: [C++] Allow AddCallback/Then to take in an optional
Executor.
Key: ARROW-12091
URL: https://issues.apache.org/jira/browse/ARROW-12091
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Reporter: Weston Pace
Right now `Executor::Transfer` isn't perfectly reliable since callbacks added
after the future has been completed will be run synchronously and so the thread
task would be spawned at the wrong time. With this feature
`Executor::Transfer` could be fixed.
This would need to be added to both `Then` and `AddCallback`.
Ideally the methods would detect if the current thread is already on the
desired executor and do nothing in that situation. Spinning up unnecessary
thread tasks would do more harm than good.
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