Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/5279#discussion_r27836835
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/ScalaReflection.scala
---
@@ -94,11 +178,95 @@ trait ScalaReflection {
case (other, _) => other
}
+ /**
+ * Creates a converter function that will convert Catalyst types to
Scala type.
+ */
+ private[sql] def createScalaConverter(dataType: DataType): Any => Any =
dataType match {
+ // Check UDT first since UDTs can override other types
+ case udt: UserDefinedType[_] =>
+ (item: Any) => udt.deserialize(item)
+
+ case arrayType: ArrayType =>
+ val elementConverter = createScalaConverter(arrayType.elementType)
+ (item: Any) => item match {
+ case s: Seq[_] => s.map(elementConverter)
+ case other => other
--- End diff --
Is this needed? It may lead to other problems (the items inside other is
not converted).
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