Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/21732
Can you give a description of the new encoding rules regarding `Option`?
e.g.
```
Option[Int] in normal encoder -> a nullable int column
Option[Int] in agg encoder -> a nullable int column
Option[Int] in tupled encoder -> a nullable int column
Option[Product] in normal encoder => a nullable struct column
Option[Product] in agg encoder => ?
...
```
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