[Rust][DataFusion] CoalesceBatchesStream doesn't honor Stream interface

[asfimport]

The Stream interface has a contract which states that you cannot poll anymore once you have received None. See futures::prelude::Stream - Rust (docs.rs)

This is not being honored and it causes a hand if you CoallesceBatchesExec after a RepartitionExec

Reporter: Ximo Guanter

PRs and other links:

• GitHub Pull Request #9574

_{Note: This issue was originally created as ARROW-11784. Please see the migration documentation for further details.}

[asfimport]

Andrew Lamb / @alamb:
Issue resolved by pull request 9574
#9574