Github user MLnick commented on the issue: https://github.com/apache/spark/pull/18305 @sethah IMO we should back out the test-related bc var explicit destroy code as it complicates things. I hear that this _may_ help catch bugs... but frankly I'm not convinced. Because the code setup & path in the source may not be quite the same as in the tests (almost never I'd say), I don't believe you will necessarily catch bugs such as the one mentioned by Yanbo.
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