Github user hvanhovell commented on the issue: https://github.com/apache/spark/pull/14444 I didn't like the trait because it added another layer of complexity (inheritance) to a relatively simple problem. The only thing you need is a shared method. That can be located anywhere. The conversion from the safe to the unsafe is an internal matter, that code is only touched when we are doing code generation. The only place we use this is in `UnsafeProjection`. So we don't really need any kind of scaffolding in place; I would just drop the entire concept of `CreateUnsafeRow`.
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