Github user ueshin commented on the issue:
https://github.com/apache/spark/pull/13873
@cloud-fan Thank you for your review.
I thought the problem is the schema would change after serialized by the
`RowEncoder` because the schema after serialization will be retrieved from the
serializer's attributes.
For example, the following test will fail:
```
val schema = new StructType()
.add("array", ArrayType(StringType, containsNull = false), nullable =
false)
val ds1 = ...
val ds2 = ds1.map(_ => Row(Array("1", "2", "3")))(RowEncoder(schema))
assert(ds2.schema === schema)
```
because `ds2.schema` becomes before this patch:
```
root
|-- array: array (nullable = true)
| |-- element: string (containsNull = true)
```
, whereas after this patch (and this would be desirable):
```
root
|-- array: array (nullable = false)
| |-- element: string (containsNull = false)
```
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