Github user lins05 commented on the issue: https://github.com/apache/spark/pull/15377 @weiqingy Emm, then we would also add the logic of checking "hadoop.caller.context.enabled" in the test code, which makes the test code simply duplicates the code path of `CallerContext.callerContextSupported`, and IMHO this doesn't make much sense... On the other hand I do agree we should test the code path, but it seems not easy to do it. @srowen @jerryshao What do you think?
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