Github user ericl commented on the issue:
https://github.com/apache/spark/pull/14022
To reduce the risk, how about changing the semantics to
```
* - spark/sparkconf/hiveconf: looks for the value in the spark config
* - system: looks for the value in the system properties
* - env: looks for the value in the environment
* - (any other or no prefix): left as-is
```
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