Github user srowen commented on the issue:
https://github.com/apache/spark/pull/14602
The thing is, we've always set an app name in all tests and examples, so I
have presumed that it's required even if running without spark-submit. I'd
assume the same behavior is assumed for SparkSession. In fact, all the code
does set app name, except the one test suite. I assumed it might have been a
quick band-aid and not the best solution. Yes you can also check the conf for
spark.app.name; it just seemed funny to intro new behavior and another
different place and way to set a default name.
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