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https://issues.apache.org/jira/browse/FLINK-6091?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15973661#comment-15973661
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ASF GitHub Bot commented on FLINK-6091:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3733#discussion_r112078731
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/aggregate/GroupAggProcessFunction.scala
---
@@ -41,14 +41,16 @@ class GroupAggProcessFunction(
private val aggregates: Array[AggregateFunction[_]],
private val aggFields: Array[Array[Int]],
private val groupings: Array[Int],
- private val aggregationStateType: RowTypeInfo)
+ private val aggregationStateType: RowTypeInfo,
+ private val generateRetraction: Boolean)
extends ProcessFunction[Row, Row] {
Preconditions.checkNotNull(aggregates)
Preconditions.checkNotNull(aggFields)
Preconditions.checkArgument(aggregates.length == aggFields.length)
private var output: Row = _
+ private var previous: Row = _
--- End diff --
rename to `previousRow`.
> Implement and turn on the retraction for aggregates
> ---------------------------------------------------
>
> Key: FLINK-6091
> URL: https://issues.apache.org/jira/browse/FLINK-6091
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Reporter: Shaoxuan Wang
> Assignee: Hequn Cheng
>
> Implement functions for generating and consuming retract messages for
> different aggregates.
> 1. add delete/add property to Row
> 2. implement functions for generating retract messages for unbounded groupBy
> 3. implement functions for handling retract messages for different aggregates.
> 4. handle retraction messages in CommonCorrelate and CommonCalc (retain
> Delete property).
> Note: Currently, only unbounded groupby generates retraction and it is
> working under unbounded and processing time mode. Hence, retraction is only
> supported for unbounded and processing time aggregations so far. We can add
> more retraction support later.
> supported now: unbounded groupby, unbounded and processing time over window
> unsupported now: group window, event time or bounded over window.
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