Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/17172#discussion_r104774584
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/objects.scala ---
@@ -219,7 +219,30 @@ case class MapElementsExec(
override def doConsume(ctx: CodegenContext, input: Seq[ExprCode], row:
ExprCode): String = {
val (funcClass, methodName) = func match {
case m: MapFunction[_, _] => classOf[MapFunction[_, _]] -> "call"
- case _ => classOf[Any => Any] -> "apply"
+ case _ =>
+ (if (child.output.length == 1) child.output(0).dataType else
NullType,
+ outputObjAttr.dataType) match {
+ // if a pair of an argument and return types is one of specific
types
+ // whose specialized method (apply$mc..$sp) is generated by
scalac,
+ // Catalyst generated a direct method call to the specialized
method.
--- End diff --
can you link to some official document or blogpost?
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