Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/6724#discussion_r32062880
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala
---
@@ -294,3 +294,40 @@ object Substring {
apply(str, pos, Literal(Integer.MAX_VALUE))
}
}
+
+/**
+ * A function that return the length of the given string expression.
+ */
+case class Length(child: Expression) extends UnaryExpression with
ExpectsInputTypes {
+
+ override def foldable: Boolean = child.foldable
+
+ override def nullable: Boolean = child.nullable
+
+ override def dataType: DataType = {
+ if (!resolved) {
--- End diff --
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