alamb commented on issue #5278:
URL:
https://github.com/apache/arrow-datafusion/issues/5278#issuecomment-1432914444
> What could be the reason for this behavior? It seems that only
CoalescePartitionsExec is affected by thread sleep.
Your test (implicitly) uses a single threaded tokio executor (so there is
only a single thread). With only a single thread, as @crepererum mentions you
need to yield control back to the scheduler (which is what `.await` does under
the covers).
I think the need for yielding is true for any cooperative scheduler system,
but using `await` definitely may make that too magical
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