Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/21739#discussion_r201092627
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/types/ObjectType.scala ---
@@ -43,7 +43,7 @@ case class ObjectType(cls: Class[_]) extends DataType {
def asNullable: DataType = this
- override def simpleString: String = cls.getName
+ override def simpleString: String = s"Object[${cls.getName}]"
--- End diff --
this is to make it differentiate between IntegerType and ObjectType with
`int` in it. Both show up in the simpleStreaing as `int`.
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