Github user shaoxuan-wang commented on a diff in the pull request:
https://github.com/apache/flink/pull/3470#discussion_r104303999
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/AggregateFunction.scala
---
@@ -35,6 +36,18 @@ abstract class AggregateFunction[T] extends
UserDefinedFunction {
def createAccumulator(): Accumulator
/**
+ * Retract the input values from the accumulator instance.
--- End diff --
I was thinking further for the dataStream retraction where the source
table could send out of date retraction message. But let us add this assumption
for now.
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