raulcd commented on code in PR #50407:
URL: https://github.com/apache/arrow/pull/50407#discussion_r3689603904


##########
ci/docker/ubuntu-22.04-cpp.dockerfile:
##########
@@ -223,6 +223,8 @@ ENV absl_SOURCE=BUNDLED \
     google_cloud_cpp_storage_SOURCE=BUNDLED \
     opentelemetry_cpp_SOURCE=BUNDLED \
     ORC_SOURCE=BUNDLED \
+    Protobuf_SOURCE=BUNDLED \
+    gRPC_SOURCE=BUNDLED \

Review Comment:
   We should probably bump `ARROW_GRPC_REQUIRED_VERSION`. I am pretty sure if 
Ubuntu 20.04 ships older GRPC than necessary, we will also have to update the 
Linux Package jobs (.deb) for old ubuntu (potentially also for old Red Hat?), 
I'll kick off Linux Packages.



##########
cpp/src/arrow/flight/transport/grpc/customize_grpc.h:
##########
@@ -86,6 +86,16 @@ ::grpc::Status FlightDataSerialize(const 
arrow::flight::FlightPayload& msg,
 // protobuf without copying
 ARROW_FLIGHT_EXPORT ::grpc::Status FlightDataDeserialize(
     ::grpc::ByteBuffer* buffer, arrow::flight::internal::FlightData* out);
+
+ARROW_FLIGHT_EXPORT
+bool IsRegisteredGrpcFlightDataMessage(

Review Comment:
   we should add some comments on why now we have to register/unregister 
FlightData messages. Are those necessary?



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