Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/7208#discussion_r34319560
--- 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 =
--- End diff --
I just need to implement either `nullSafeEval` or `eval`.
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