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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