Github user tarekauel commented on a diff in the pull request: https://github.com/apache/spark/pull/7208#discussion_r34008942 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala --- @@ -301,10 +307,40 @@ case class StringLength(child: Expression) extends UnaryExpression with ExpectsI } /** - * A function that return the Levenshtein distance between the two given strings. + * Returns string, with the first letter of each word in uppercase, + * all other letters in lowercase. Words are delimited by whitespace. */ +case class InitCap(child: Expression) extends UnaryExpression with ExpectsInputTypes { + override def dataType: DataType = StringType + + override def inputTypes: Seq[DataType] = Seq(StringType) + + override def eval(input: InternalRow): Any = { + val string = child.eval(input) + if (string == null) { + null + } + else if (string.asInstanceOf[UTF8String].length == 0) { + return UTF8String.fromString(string.toString) + } + else { + val str: String = string.toString + val sb = new StringBuilder + sb.append(str) + sb.setCharAt(0, sb(0).toUpper) + + for (i <- 1 until sb.length) { + if (sb(i - 1).equals(' ')) { --- End diff -- @davies Should `initCap` consider only spaces or all whitespaces: `Character.isWhitespace`, see http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/8u40-b25/java/lang/Character.java#Character.isWhitespace%28char%29
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