Github user tarekauel commented on a diff in the pull request:
https://github.com/apache/spark/pull/7208#discussion_r34867691
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala
---
@@ -593,6 +593,33 @@ case class Levenshtein(left: Expression, right:
Expression) extends BinaryExpres
}
/**
+ * 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 nullSafeEval(string: Any): Any = {
+ if (string.asInstanceOf[UTF8String].getBytes.length == 0) {
+ return string
+ }
+ 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)
--- End diff --
My idea would be that we check if the next character fits `Char`. If yes we
convert it to Char, call `Character.toUpperCase(c)` and change the result int
the array. If we cannot convert it to Char, we "ignore" it and don't change it.
But as Reynold mentioned, we can do this in a second step.
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