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https://issues.apache.org/jira/browse/FLINK-5956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15895986#comment-15895986
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ASF GitHub Bot commented on FLINK-5956:
---------------------------------------
Github user shaoxuan-wang commented on a diff in the pull request:
https://github.com/apache/flink/pull/3470#discussion_r104300989
--- 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 --
I think it should be ok to use "accumulator" here. Retract is a method, it
retracts the value from the accumulator.
> Add retract method into the aggregateFunction
> ---------------------------------------------
>
> Key: FLINK-5956
> URL: https://issues.apache.org/jira/browse/FLINK-5956
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Reporter: Shaoxuan Wang
> Assignee: Shaoxuan Wang
>
> Retraction method is help for processing updated message. It will also very
> helpful for window Aggregation. This PR will first add retraction methods
> into the aggregateFunctions, such that on-going over window Aggregation can
> get benefit from it.
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