Github user steveloughran commented on the issue:
https://github.com/apache/spark/pull/14601
1. It's good to have some tests
2. I note that `appendS3AndSparkHadoopConfigurations()` has a weakness in
how it propagates env vars: no propagation of the session environment
{{AWS_SESSION_TOKEN}} variable to "fs.s3a.session.token", same for region.
That's probably significant enough to have its own JIRA though
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