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  1. Apache Arrow
  2. ARROW-8744

[Rust] ParquetIterator's next method should be safe to call even after reached end of iteration

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      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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