Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/1586#discussion_r15548161
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala
---
@@ -209,6 +212,82 @@ case class EndsWith(left: Expression, right:
Expression)
}
/**
+ * A function that returns the number of bytes in an expression
+ */
+case class Length(child: Expression) extends UnaryExpression {
+
+ type EvaluatedType = Any
+
+ override def dataType = IntegerType
+
+ override def foldable = child.foldable
+
+ override def nullable = child.nullable
+
+ override def toString = s"Length($child)"
+
+ override def eval(input: Row): EvaluatedType = {
+ val string = child.eval(input)
+ if (string == null) {
+ null
+ } else if (!string.isInstanceOf[String]) {
+ string.toString.length
--- End diff --
dataType should return IntegerType. Here, instead of doing .isInstanceOf I
think you should instead be doing child.dataType == StringType and
child.dataType == BinaryType. If its neither of those you should throw an
exception.
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