Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/7113#discussion_r33748063
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/math.scala
---
@@ -354,6 +354,58 @@ case class Pow(left: Expression, right: Expression)
}
}
+/**
+ * Performs the inverse operation of HEX.
+ * Resulting characters are returned as a byte array.
+ */
+case class UnHex(child: Expression) extends UnaryExpression with
Serializable {
+
+ override def dataType: DataType = BinaryType
+
+ override def checkInputDataTypes(): TypeCheckResult = {
--- End diff --
and remove this once the expression extends ExpectsInputTypes
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