xkrogen commented on pull request #31461:
URL: https://github.com/apache/spark/pull/31461#issuecomment-772861163
I believe we're talking about these methods on `UserDefinedType`:
```
def serialize(obj: UserType): Any
def deserialize(datum: Any): UserType
```
They use `Any` so it doesn't _look_ like they require use of internal Spark
APIs, but based on my understanding of @viirya's PR they are expecting types
such as `InternalRow`
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