Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/2475#discussion_r19648230
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/types/dataTypes.scala
---
@@ -389,7 +389,7 @@ case class ArrayType(elementType: DataType,
containsNull: Boolean) extends DataT
* @param dataType The data type of this field.
* @param nullable Indicates if values of this field can be `null` values.
*/
-case class StructField(name: String, dataType: DataType, nullable:
Boolean) {
+case class StructField(name: String, dataType: DataType, nullable: Boolean
= true) {
--- End diff --
We don't _need_ to, but `nullablility` is purely an optimization (that we
don't even take advantage of for the most part). Other parts of the API
already default nullable to true.
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