Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/7181#discussion_r33751680
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/math.scala
---
@@ -303,6 +295,66 @@ case class Hex(child: Expression) extends
UnaryExpression with Serializable {
}
}
+/**
+ * Performs the inverse operation of HEX.
+ * Resulting characters are returned as a byte array.
+ */
+case class Unhex(child: Expression)
+ extends UnaryExpression with AutoCastInputTypes with Serializable {
--- End diff --
can you use ExpectsInputTypes here? since I will remove AutoCastInputTypes.
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