lidavidm commented on pull request #11920:
URL: https://github.com/apache/arrow/pull/11920#issuecomment-990135085


   Example output, from the unit test:
   
   (The unit test will not normally print this, I just modified it to 
double-check the results.)
   
   ```
   {
     name          : DoAction
     trace_id      : a9d2a9ecd0aec3bb44bd10ad940a31b7
     span_id       : 7b025703fe739005
     tracestate    : 
     parent_span_id: 0000000000000000
     start         : 1639076215603966576
     duration      : 739917
     description   : 
     span kind     : Server
     status        : Ok
     attributes    : 
        thread_id: 140075521935104
        rpc.grpc.status_code: 0
        rpc.method: DoAction
        rpc.service: arrow.flight.protocol.FlightService
        rpc.system: grpc
     events        : 
     links         : 
     resources     : 
        service.name: unknown_service
        telemetry.sdk.version: 1.1.0
        telemetry.sdk.name: opentelemetry
        telemetry.sdk.language: cpp
     instr-lib     : arrow
   }
   {
     name          : DoAction
     trace_id      : a605cd6ac77d28ea4fc94062bb0ba455
     span_id       : f599a779803fdf67
     tracestate    : 
     parent_span_id: a9d7e9435894a240
     start         : 1639076215610106244
     duration      : 236620
     description   : 
     span kind     : Server
     status        : Ok
     attributes    : 
        thread_id: 140075513542400
        rpc.grpc.status_code: 0
        rpc.method: DoAction
        rpc.service: arrow.flight.protocol.FlightService
        rpc.system: grpc
     events        : 
     links         : 
     resources     : 
        service.name: unknown_service
        telemetry.sdk.version: 1.1.0
        telemetry.sdk.name: opentelemetry
        telemetry.sdk.language: cpp
     instr-lib     : arrow
   }
   {
     name          : test
     trace_id      : a605cd6ac77d28ea4fc94062bb0ba455
     span_id       : a9d7e9435894a240
     tracestate    : 
     parent_span_id: 0000000000000000
     start         : 1639076215607131441
     duration      : 3385487
     description   : 
     span kind     : Internal
     status        : Unset
     attributes    : 
        thread_id: 140075633232128
     events        : 
     links         : 
     resources     : 
        service.name: unknown_service
        telemetry.sdk.version: 1.1.0
        telemetry.sdk.name: opentelemetry
        telemetry.sdk.language: cpp
     instr-lib     : arrow
   }
   ```


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