Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/6724#discussion_r32092705
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala
---
@@ -294,3 +294,35 @@ object Substring {
apply(str, pos, Literal(Integer.MAX_VALUE))
}
}
+
+/**
+ * A function that return the length of the given string expression.
+ */
+case class StringLength(child: Expression) extends UnaryExpression with
ExpectsInputTypes {
+
+ override def foldable: Boolean = child.foldable
+
+ override def nullable: Boolean = child.nullable
+
+ override def dataType: DataType = IntegerType
+
+ override def expectedChildTypes: Seq[DataType] = Seq(StringType)
+
+ override def eval(input: Row): Any = {
+ val string = child.eval(input)
+
--- End diff --
and condense the following into one line?
```
if (string == null) null else string.asInstanceOf[UTF8String].length
```
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