Github user zsxwing commented on the issue: https://github.com/apache/spark/pull/19687 @ManchesterUnited16 `cleanUpReflectionObjects` introduces new closures but those are created in `object ScalaReflection` so should be safe. Did you backport my PR to an old Spark version? If so, you probably hit https://github.com/apache/spark/pull/17639. Anyway, I added some defensive codes in the test to make sure encoders are serializable.
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