Github user KurtYoung commented on a diff in the pull request:
https://github.com/apache/flink/pull/2976#discussion_r94104787
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/aggregate/AggregateReduceGroupFunction.scala
---
@@ -40,6 +40,7 @@ class AggregateReduceGroupFunction(
private val aggregates: Array[Aggregate[_ <: Any]],
private val groupKeysMapping: Array[(Int, Int)],
private val aggregateMapping: Array[(Int, Int)],
+ private val additionalMapping: Array[(Int, Int)],
--- End diff --
Please update the class document
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