Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/2998#discussion_r19653069
--- 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 --
I am not so sure if the regex works here, but another option is likely to
be use the `org.apache.commons.lang.StringUtils`, see
https://github.com/apache/hive/blob/b8250ac2f30539f6b23ce80a20a9e338d3d31458/ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDFLTrim.java
---
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