Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/6976#discussion_r33420126
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/math.scala
---
@@ -287,6 +286,88 @@ case class Pow(left: Expression, right: 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 hexadecimal representation and
returns the resulting STRING.
+ * Negative numbers would be treated as two's complement.
+ */
+case class Hex(child: Expression)
+ extends UnaryExpression with Serializable {
+
+ override def dataType: DataType = StringType
+
+ override def checkInputDataTypes(): TypeCheckResult = {
+ if (child.dataType.isInstanceOf[StringType]
+ || child.dataType.isInstanceOf[IntegerType]
+ || child.dataType.isInstanceOf[LongType]
+ || child .dataType.isInstanceOf[BinaryType]
--- End diff --
`child.dataType`, remove the space.
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