Github user tarekauel commented on a diff in the pull request:
https://github.com/apache/spark/pull/7034#discussion_r33746831
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCheckResult.scala
---
@@ -43,3 +47,96 @@ object TypeCheckResult {
def isSuccess: Boolean = false
}
}
+
+/**
+ * Describe what data type of the child expression can be accepted by a
expression.
+ */
+abstract class AcceptType {
+ def accept(dt: DataType): Boolean
+}
+
+/**
+ * Accept all of the data types for the child expression.
+ */
+case object AcceptAllType extends AcceptType {
+ def accept(dt: DataType): Boolean = true
+ override def toString(): String = {
+ "AcceptAllType"
+ }
+}
+
+/**
+ * Accept all of the data types, except the [[UserDefinedType]] for the
child expression.
+ */
+case object AcceptAllTypeExceptUserDefinedType extends AcceptType {
+ def accept(dt: DataType): Boolean = if
(dt.isInstanceOf[UserDefinedType[_]]) false else true
--- End diff --
`!(dt.isInstanceOf[UserDefinedType[_]])`
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