non-ascii char

Author: zhichao-li

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/math.scala

@@ -327,7 +327,7 @@ case class Hex(child: Expression)
    * Converts every character in s to two hex digits.
    */
   private def hex(str: UTF8String): UTF8String = {
-    doHex(str.getBytes, str.length())
+    hex(str.getBytes)
   }
 
   private def hex(bytes: Array[Byte]): UTF8String = {

sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/MathFunctionsSuite.scala

@@ -232,6 +232,7 @@ class MathFunctionsSuite extends SparkFunSuite with ExpressionEvalHelper {
     checkEvaluation(Hex(Literal(-100800200404L)), "FFFFFFE887D7012C")
     checkEvaluation(Hex(Literal("helloHex")), "68656C6C6F486578")
     checkEvaluation(Hex(Literal("helloHex".getBytes())), "68656C6C6F486578")
+    checkEvaluation(Hex(Literal("三重的")), "E4B889E9878DE79A84")
   }
 
   test("hypot") {