Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/13873
This sample program still fails:
cc @ueshin
```
val schema = new StructType()
.add("array", ArrayType(StringType, containsNull = false), nullable =
false)
val ds1 = Seq(1).toDS
val ds2 = ds1.map(_ => Row(Array("1", "2", "3")))(RowEncoder(schema))
print(s"schema: $schema\n")
print(s"ds2.schema: ${ds2.schema}\n")
ds2.printSchema
assert(ds2.schema === schema)
```
output
```
schema: StructType(StructField(array,ArrayType(StringType,false),false))
ds2.schema: StructType(StructField(array,ArrayType(StringType,true),false))
root
|-- array: array (nullable = false)
| |-- element: string (containsNull = true)
...
```
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