westonpace commented on pull request #9842:
URL: https://github.com/apache/arrow/pull/9842#issuecomment-810312995
I think it would end up using something very similar if not exactly
TaskGroup in order to know when to write the end token to the generator.
Something like
```
task_group_.FinishAsync().Then([producer] {
producer.Close();
});
```
Did you have an alternative approach in mind?
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