Github user chenghao-intel commented on a diff in the pull request: https://github.com/apache/spark/pull/7208#discussion_r34234948 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala --- @@ -275,18 +276,66 @@ 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) + + protected override def nullSafeEval(string: Any): Any = + string.asInstanceOf[UTF8String].numChars + + override def eval(input: InternalRow): Any = { + val string = child.eval(input) + if (string == null) { + null + } + else if (string.asInstanceOf[UTF8String].getBytes.length == 0) { + UTF8String.fromString(string.toString) + } + else { + val sb = new StringBuffer() + sb.append(string) + sb.setCharAt(0, sb.charAt(0).toUpper) + for (i <- 1 until sb.length) { + if (sb.charAt(i - 1).equals(' ')) { + sb.setCharAt(i, sb.charAt(i).toUpper) + } + } + UTF8String.fromString(sb.toString) + } + + } +} + case class Levenshtein(left: Expression, right: Expression) extends BinaryExpression - with ExpectsInputTypes { +with ExpectsInputTypes { --- End diff -- This should be 2 spaces.
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