Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3470#discussion_r104296481
--- 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.
+ *
+ * @param accumulator the accumulator which contains the current
+ * aggregated results
+ * @param input the input value (usually obtained from a new
arrived data)
--- End diff --
rename parameter to `retraction`?
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