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https://issues.apache.org/jira/browse/FLINK-5956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15897146#comment-15897146
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ASF GitHub Bot commented on FLINK-5956:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3470#discussion_r104389792
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/aggfunctions/AvgAggFunction.scala
---
@@ -321,12 +317,11 @@ class DecimalAvgAggFunction extends
AggregateFunction[BigDecimal] {
if (value != null) {
val v = value.asInstanceOf[BigDecimal]
val accum = accumulator.asInstanceOf[DecimalAvgAccumulator]
+ accum.f0 = accum.f0.subtract(v)
+ accum.f1 -= 1L
if (accum.f1 == 0) {
--- End diff --
Do we need this check?
It only makes sense if we assume that accumulated and retracted values
differ. But if that's the case all values for `cnt != 0` would be considered
wrong.
> 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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