Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/1822#discussion_r16007364
--- Diff: sql/hive/src/main/scala/org/apache/spark/sql/hive/hiveUdfs.scala
---
@@ -340,4 +340,9 @@ private[hive] case class HiveUdafFunction(
val inputs = inputProjection(input).asInstanceOf[Seq[AnyRef]].toArray
function.iterate(buffer, inputs)
}
+
+ override def merge(input: AggregateFunction): Unit = {
--- End diff --
Does this mean that we cant do external aggregation if there are hive
UDAFS. We should be throwing an exception here. It is very bad to silently
return wrong results.
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