lidavidm commented on pull request #11925:
URL: https://github.com/apache/arrow/pull/11925#issuecomment-990325579


   Example of ostream output:
   
   ```
   {
     name          : test
     trace_id      : 577bb5359fd4c9babdfb7e8def43d476
     span_id       : 41655856137c4635
     tracestate    : 
     parent_span_id: 0000000000000000
     start         : 1639087427620946845
     duration      : 8538876
     description   : 
     span kind     : Internal
     status        : Unset
     attributes    : 
        thread_id: 140062552533184
        foo: bar
     events        : 
     links         : 
     resources     : 
        service.name: unknown_service
        telemetry.sdk.version: 1.1.0
        telemetry.sdk.name: opentelemetry
        telemetry.sdk.language: cpp
     instr-lib     : arrow
   }
   ```
   
   Example of OTLP output:
   
   ```
   
{"resource":{"attributes":[{"key":"service.name","value":{"stringValue":"unknown_service"}},{"key":"telemetry.sdk.version","value":{"stringValue":"1.1.0"}},{"key":"telemetry.sdk.name","value":{"stringValue":"opentelemetry"}},{"key":"telemetry.sdk.language","value":{"stringValue":"cpp"}}]},"instrumentationLibrarySpans":[{"instrumentationLibrary":{"name":"arrow"},"spans":[{"traceId":"ID+DVD1Rarxdh8dNLchUmw==","spanId":"7IGA2C88AQk=","parentSpanId":"AAAAAAAAAAA=","name":"test","kind":"SPAN_KIND_INTERNAL","startTimeUnixNano":"1639087084846448841","endTimeUnixNano":"1639087084849284338","attributes":[{"key":"foo","value":{"stringValue":"bar"}},{"key":"thread_id","value":{"stringValue":"140253881153728"}}]},{"traceId":"pPN+j22d17tQVbHZpG6pbA==","spanId":"6apExpYokXw=","parentSpanId":"AAAAAAAAAAA=","name":"test","kind":"SPAN_KIND_INTERNAL","startTimeUnixNano":"1639087084850354448","endTimeUnixNano":"1639087084853673659","attributes":[{"key":"foo","value":{"stringValue":"bar"}},{"key":"th
 
read_id","value":{"stringValue":"140253881153728"}}]},{"traceId":"yVWEeB/z4NedBKrCdezTMg==","spanId":"4AGb3ndTHek=","parentSpanId":"AAAAAAAAAAA=","name":"test","kind":"SPAN_KIND_INTERNAL","startTimeUnixNano":"1639087084873028556","endTimeUnixNano":"1639087084876243603","attributes":[{"key":"foo","value":{"stringValue":"bar"}},{"key":"thread_id","value":{"stringValue":"140253881153728"}}]}]}]}
   ```


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