Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3423#discussion_r103727403
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/aggregate/AggregateReduceCombineFunction.scala
---
@@ -69,11 +69,25 @@ class AggregateReduceCombineFunction(
new JArrayList[Accumulator]()
--- End diff --
Move the array and the ArrayLists out of the `combine()` method and clean
it at the beginning of `combine()` instead of creating new objects.
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