QP Hou created ARROW-8744:
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Summary: [Rust] ParquetIterator's next method should be safe to
call even after reached end of iteration
Key: ARROW-8744
URL: https://issues.apache.org/jira/browse/ARROW-8744
Project: Apache Arrow
Issue Type: Improvement
Reporter: QP Hou
Assignee: QP Hou
Once reached end of iteration, calling next on ParquetIterator will result in
an error. This is inconvenient in two ways:
* when shared between multiple threads, only one of the thread will be able to
terminate without error
* sender for response_rx cannot terminate the iteration early and free up
resources, instead, it needs to always wait for signal from request_tx before
closing up the connection
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