alamb commented on a change in pull request #1283:
URL: https://github.com/apache/arrow-datafusion/pull/1283#discussion_r747453178



##########
File path: ballista/rust/core/src/client.rs
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@@ -135,24 +135,28 @@ impl BallistaClient {
 }
 
 struct FlightDataStream {
-    stream: Streaming<FlightData>,
+    stream: Mutex<Streaming<FlightData>>,

Review comment:
       this is needed because after tonic/prost upgrade `FlightData` is no 
longer `Sync`. There are perhaps better ways to handle this




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