alamb edited a comment on pull request #1283:
URL: https://github.com/apache/arrow-datafusion/pull/1283#issuecomment-966248233


   When upgrading arrow only, the build fails like this 
   ```
      Compiling datafusion v5.1.0 
(/Users/alamb/Software/arrow-datafusion/datafusion)
   error[E0308]: mismatched types
     --> ballista/rust/core/src/client.rs:75:19
      |
   75 |         Ok(Self { flight_client })
      |                   ^^^^^^^^^^^^^ expected struct `Channel`, found struct 
`tonic::transport::channel::Channel`
      |
      = note: expected struct `FlightServiceClient<Channel>`
                 found struct 
`FlightServiceClient<tonic::transport::channel::Channel>`
      = note: perhaps two different versions of crate `tonic` are being used?
   
   error[E0599]: the method `do_get` exists for struct 
`FlightServiceClient<Channel>`, but its trait bounds were not satisfied
      --> ballista/rust/core/src/client.rs:112:14
       |
   112 |             .do_get(request)
       |              ^^^^^^ method cannot be called on 
`FlightServiceClient<Channel>` due to unsatisfied trait bounds
       |
      ::: 
/Users/alamb/.cargo/registry/src/github.com-1ecc6299db9ec823/tonic-0.5.2/src/transport/channel/mod.rs:68:1
       |
   68  | pub struct Channel {
       | ------------------
       | |
       | doesn't satisfy `<_ as 
Service<tonic::codegen::http::Request<http_body::combinators::box_body::UnsyncBoxBody<prost::bytes::Bytes,
 tonic::status::Status>>>>::Response = tonic::codegen::http::Response<_>`
       | doesn't satisfy `_: 
Service<tonic::codegen::http::Request<http_body::combinators::box_body::UnsyncBoxBody<prost::bytes::Bytes,
 tonic::status::Status>>>`
       | doesn't satisfy `_: 
tonic::client::service::GrpcService<http_body::combinators::box_body::UnsyncBoxBody<prost::bytes::Bytes,
 tonic::status::Status>>`
       |
       = note: the following trait bounds were not satisfied:
               `Channel: 
tonic::client::service::GrpcService<http_body::combinators::box_body::UnsyncBoxBody<prost::bytes::Bytes,
 tonic::status::Status>>`
               `<Channel as 
Service<tonic::codegen::http::Request<http_body::combinators::box_body::UnsyncBoxBody<prost::bytes::Bytes,
 tonic::status::Status>>>>::Response = tonic::codegen::http::Response<_>`
               `Channel: 
Service<tonic::codegen::http::Request<http_body::combinators::box_body::UnsyncBoxBody<prost::bytes::Bytes,
 tonic::status::Status>>>`
   
   ```
   


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