Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/993#discussion_r15331132
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/ScalaUdf.scala
---
@@ -29,6 +29,7 @@ case class ScalaUdf(function: AnyRef, dataType: DataType,
children: Seq[Expressi
override def eval(input: Row): Any = {
children.size match {
+ case 0 => function.asInstanceOf[() => Any]()
--- End diff --
this is for another time, but if you add an explicitly init to expressions,
we can move all of these branches from the inner loop (once per row) directly
to the outer loop (once per partition).
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