Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/8874#discussion_r40261146
--- Diff: sql/hive/src/main/scala/org/apache/spark/sql/hive/hiveUDFs.scala
---
@@ -586,47 +524,78 @@ private[hive] case class HiveGenericUDTF(
private[hive] case class HiveUDAFFunction(
--- End diff --
It will be better to explain that if a query has a HiveUDAF, then we will
not do partial aggregation.
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