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https://issues.apache.org/jira/browse/FLINK-25475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17467081#comment-17467081
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ChangjiGuo commented on FLINK-25475:
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Are there any side effects if the StreamExecMiniBatchAssigner node is added to
the front of StreamExecGroupAggregate node? As far as I know, the current
implementation is added in front of the source node or watermark node.
> When windowAgg and groupAgg are included at the same time, there is no
> assigner generated but MiniBatch optimization is still used.
> -----------------------------------------------------------------------------------------------------------------------------------
>
> Key: FLINK-25475
> URL: https://issues.apache.org/jira/browse/FLINK-25475
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Reporter: ChangjiGuo
> Priority: Major
> Attachments: image-2021-12-29-16-04-50-211.png,
> image-2021-12-29-16-05-15-519.png
>
>
> If the relNode has both windowAgg and groupAgg, MiniBatchIntervalInferRule
> will not add StreamExecMiniBatchAssigner node, but MiniBatchGroupAggFunction
> or MiniBatchLocalGroupAggFunction or MiniBatchGlobalGroupAggFunction will
> still be generated when translated into transformation.
> It will only judge whether to enable minibacth.
> {code:java}
> val operator = if (isMiniBatchEnabled) {
> val aggFunction = new MiniBatchGroupAggFunction(
> aggsHandler,
> recordEqualiser,
> accTypes,
> inputRowType,
> inputCountIndex,
> generateUpdateBefore)
> new KeyedMapBundleOperator(
> aggFunction,
> AggregateUtil.createMiniBatchTrigger(tableConfig))
> } else {
> val aggFunction = new GroupAggFunction(
> tableConfig.getMinIdleStateRetentionTime,
> tableConfig.getMaxIdleStateRetentionTime,
> aggsHandler,
> recordEqualiser,
> accTypes,
> inputCountIndex,
> generateUpdateBefore)
> val operator = new KeyedProcessOperator[RowData, RowData,
> RowData](aggFunction)
> operator
> } {code}
> for example:
> before:
> !image-2021-12-29-16-04-50-211.png!
> after:
> !image-2021-12-29-16-05-15-519.png!
> The WatermarkAssigner will send watermark to downstream, and the finishBundle
> method will be called frequently, which does not match the expected result.
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