lidavidm commented on a change in pull request #7994:
URL: https://github.com/apache/arrow/pull/7994#discussion_r506759118



##########
File path: 
java/flight/flight-core/src/main/java/org/apache/arrow/flight/CallOptions.java
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@@ -56,7 +56,7 @@ public static CallOption timeout(long duration, TimeUnit 
unit) {
   /**
    * CallOptions specific to GRPC stubs.
    */
-  interface GrpcCallOption extends CallOption {
+  public interface GrpcCallOption extends CallOption {

Review comment:
       Hmm, that is a problem. We also don't want to expose gRPC details from 
the core package, though...leaving this as-is is probably simplest, though, 
seeing as a non-gRPC flight implementation is still a ways off.




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