Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/15780
Some more thoughts: in `ExpressionEncoder` we get the schema of encoder by
```
val schema = ScalaReflection.schemaFor[T] match {
case ScalaReflection.Schema(s: StructType, _) => s
case ScalaReflection.Schema(dt, nullable) => new
StructType().add("value", dt, nullable)
}
```
now we fix the nullability of the serializer expressions, can we just use
`val schema = serializer.schema` and see if tests can pass?
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