kou commented on issue #41919:
URL: https://github.com/apache/arrow/issues/41919#issuecomment-2143719349

   > By "this" I assume you mean the suggestion I made in the linked issue to 
change SetToken to take a shared_ptr argument by value instead of a raw pointer.
   
   Right.
   
   > our server rotates authentication tokens after a period of time, and keeps 
the old one valid for a while after it has been rotated
   
   If a server does it and a client is used only for one user, it doesn't use 
wrong authentication as you said.
   
   But, in general, `FlightClient` can't assume them. For example, a client may 
be shared with multiple users.
   
   I don't object this approach because it's better than crashing. Could you 
open a PR?
   
   But I think that we still need to update our documentation even with this 
change: https://github.com/apache/arrow/issues/38565#issuecomment-1800131268 


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