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https://issues.apache.org/jira/browse/ARROW-7544?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17014475#comment-17014475
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Wes McKinney commented on ARROW-7544:
-------------------------------------

I don't think this is a bug, this is what the example server is programmed to 
return

https://github.com/apache/arrow/blob/master/python/examples/flight/server.py#L87

> [Python] pyarrow.lib.ArrowNotImplementedError: gRPC returned unimplemented 
> error, with message: clear is not implemented
> ------------------------------------------------------------------------------------------------------------------------
>
>                 Key: ARROW-7544
>                 URL: https://issues.apache.org/jira/browse/ARROW-7544
>             Project: Apache Arrow
>          Issue Type: Bug
>            Reporter: Ji Wong Park
>            Priority: Minor
>
> /arrow/python/examples/flight$ py client.py do 0.0.0.0:5005 clear
>  
> Running action clear
> Traceback (most recent call last):
>  File "client.py", line 162, in <module>
>  main()
>  File "client.py", line 158, in main
>  commands[args.action](args, client)
>  File "client.py", line 69, in do_action
>  for result in client.do_action(action):
>  File "pyarrow/_flight.pyx", line 1068, in do_action
>  File "pyarrow/_flight.pyx", line 75, in pyarrow._flight.check_flight_status
>  File "pyarrow/error.pxi", line 105, in pyarrow.lib.check_status
> pyarrow.lib.ArrowNotImplementedError: gRPC returned unimplemented error, with 
> message: clear is not implemented.. Detail: Python exception: 
> NotImplementedError



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