Github user tarekauel commented on a diff in the pull request: https://github.com/apache/spark/pull/7208#discussion_r34008401 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala --- @@ -298,3 +299,36 @@ case class StringLength(child: Expression) extends UnaryExpression with ExpectsI override def prettyName: String = "length" } + +/** + * 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.toString.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(' ')) { + sb.setCharAt(i, sb(i).toUpper) + } --- End diff -- Why?
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