Github user cloud-fan commented on the issue: https://github.com/apache/spark/pull/21106 I think `UnsafeProjectionCreator` is only useful for tests, because in production we should always try codegen first, and fallback to interpretation if codegen fails. There is no need to disable the fallback(always codegen) or skip the codegen(always interpretation) in production. How about we provide a sql conf for test only, to be able to disable the fallback(always codegen) or skip the codegen(always interpretation)?
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