DO NOT USE THIS INSTANCE FOR LIVE DATA!!!!
https://spark-tests.appspot.com/test-details?suite_name=org.apache.spark.sql.streaming.FileStreamSourceSuite&test_name=when+schema+inference+is+turned+on%2C+should+read+partition+data
[Github] Pull Request #15577 (zsxwing)
[Github] Pull Request #15699 (zsxwing)