Github user OopsOutOfMemory commented on a diff in the pull request:
https://github.com/apache/spark/pull/2998#discussion_r19653994
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala
---
@@ -134,10 +157,51 @@ case class RLike(left: Expression, right: Expression)
override def matches(regex: Pattern, str: String): Boolean =
regex.matcher(str).find(0)
}
+
+/**
+ * A function that strip whitespace (or other characters) from the
beginning of a string
+ */
+case class Ltrim(child: Expression) extends UnaryExpression with
StringTransformationExpression {
+
+ override def convert(v: String): String = v.replaceAll("^\\s+", "")
--- End diff --
Good idea, it's more mature to use the commons-lang jar than the regex
expression.
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