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  1. Apache Arrow
  2. ARROW-9168

[C++][Flight] allow flight benchmark to use separated TCP connections

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      Flight benchmark performs worse when working threads increases. It can be improved by setting gRPC option GRPC_ARG_USE_LOCAL_SUBCHANNEL_POOL to make each client creating its own TCP connection to server, without sharing one connection.
      We can add a cmdline parameter to enable/disable TCP connection sharing.

      Details at https://lists.apache.org/thread.html/r37ae0e5139d86a17fb50891ce7430c6bfd07979183d6ec335d2bc92e%40%3Cdev.arrow.apache.org%3E

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              yibocai Yibo Cai
              yibocai Yibo Cai
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