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https://issues.apache.org/jira/browse/SPARK-26655?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-26655:
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Assignee: Apache Spark
> Support multiple aggregates in Structured Streaming append mode
> ---------------------------------------------------------------
>
> Key: SPARK-26655
> URL: https://issues.apache.org/jira/browse/SPARK-26655
> Project: Spark
> Issue Type: Improvement
> Components: Structured Streaming
> Affects Versions: 3.0.0
> Reporter: Arun Mahadevan
> Assignee: Apache Spark
> Priority: Major
>
> Right now multiple aggregates are not supported in structured streaming.
> However, in append mode, the aggregates are emitted only after the watermark
> passes the threshold (e.g. the window boundary) and the emitted value is not
> affected by further late data. So it possible to chain multiple aggregates in
> 'Append' output mode without worrying about retractions.
> However the current event time watermarks in structured streaming are tracked
> at a global level and this does not work when aggregates are chained.
> We need to track the watermarks at individual operator level so that each
> operator can make progress independently and not rely on global min or max
> value.
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