Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3423#discussion_r103476693
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/aggregate/DataSetWindowAggregateMapFunction.scala
---
@@ -34,13 +35,13 @@ import org.apache.flink.util.Preconditions
* append an (aligned) rowtime field to the end of the output row.
*/
class DataSetWindowAggregateMapFunction(
--- End diff --
We could remove this method if we rework the subsequent combine and
groupReduce functions. This would allow use to use `accumulate` in `combine()`
or non-combined `groupReduce()`.
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