Github user mallman commented on the issue: https://github.com/apache/spark/pull/16578 > NPE is a problem though. any luck isolating that further? I can push a commit that prevents it, I just can't say for certain it's a proper fix versus a mere workaround. I'd like to push a unit test to trigger this bug, too, but I haven't written that yet. This is something that occurs only when codegen is turned on, so I need to figure out how to write a test that runs with and without codegen turned on. There's probably a test harness of sorts for this kind of test already.
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