Github user chenghao-intel commented on a diff in the pull request: https://github.com/apache/spark/pull/6976#discussion_r33142999 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/math.scala --- @@ -289,6 +290,96 @@ 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] + || child.dataType == NullType) { + TypeCheckResult.TypeCheckSuccess + } else { + TypeCheckResult.TypeCheckFailure(s"hex doesn't accepts ${child.dataType} type") + } + } + + override def eval(input: InternalRow): Any = { + val num = child.eval(input) + if (num == null) { + null + } else { + child.dataType match { + case LongType => hex(num.asInstanceOf[Long]) + case IntegerType => hex(num.asInstanceOf[Integer].toLong) + case BinaryType => hex(num.asInstanceOf[Array[Byte]]) + case StringType => hex(num.asInstanceOf[UTF8String]) + } + } + } + + /** + * Converts every character in s to two hex digits. + */ + private def hex(str: UTF8String): UTF8String = { + if (str == null) { --- End diff -- remove the null checking, as it's did in eval already.
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