Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/7548#discussion_r35064307
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/math.scala
---
@@ -583,6 +547,60 @@ case class Unhex(child: Expression)
}
}
+/**
+ * If the argument is an INT or binary, hex returns the number as a STRING
in hexadecimal format.
+ * Otherwise if the number is a STRING, it converts each character into
its hex representation
+ * and returns the resulting STRING. Negative numbers would be treated as
two's complement.
+ */
+case class Hex(child: Expression) extends UnaryExpression with
ImplicitCastInputTypes {
+
+ override def inputTypes: Seq[AbstractDataType] =
+ Seq(TypeCollection(LongType, BinaryType, StringType))
+
+ override def dataType: DataType = StringType
+
+ protected override def nullSafeEval(num: Any): Any = child.dataType
match {
+ case LongType => Hex.hex(num.asInstanceOf[Long])
--- End diff --
Ooops, my mistake...
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