lidavidm commented on a change in pull request #10906:
URL: https://github.com/apache/arrow/pull/10906#discussion_r695117858



##########
File path: format/FlightSql.proto
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@@ -0,0 +1,454 @@
+/*

Review comment:
       I would be a little worried about supporting LTS releases of Ubuntu and 
such. It does seem to be in conda-forge already, at least.
   
   And we already vary our Protobuf version based on features requested: 
https://github.com/apache/arrow/blob/04575bc8e90216d8e685d1b857f487708426001c/cpp/cmake_modules/ThirdpartyToolchain.cmake#L1415-L1424
 so I suppose this wouldn't change the situation there (20.04 LTS ships 
Protobuf 3.6 anyways).
   
   We may also have to bump Protobuf if/when we upgrade gRPC, though, I cannot 
figure out what exactly gRPC requires even after some searching. It seems v1.38 
uses Protobuf 3.15 though it is not clear if that is a hard floor or not. 
   
   @kszucs how much trouble would it be to bump our Protobuf version?




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