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https://issues.apache.org/jira/browse/SPARK-31838?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xingcan Cui updated SPARK-31838:
--------------------------------
Parent: SPARK-31724
Issue Type: Sub-task (was: Bug)
> The streaming output mode validator didn't treat union well
> -----------------------------------------------------------
>
> Key: SPARK-31838
> URL: https://issues.apache.org/jira/browse/SPARK-31838
> Project: Spark
> Issue Type: Sub-task
> Components: Structured Streaming
> Affects Versions: 3.0.0
> Reporter: Xingcan Cui
> Priority: Major
>
> {{UnsupportedOperationChecker.checkForStreaming}} didn't treat the union
> operator well (it only assumes a linear query plan). To temporarily fix the
> broken semantics before we have a complete improvement plan for the output
> mode, the validator should do the following.
> 1. Allow multiple (two for now) aggregations from different branches of the
> last union operator.
> 2. For complete output mode, disallow a union on streams with and without
> aggregations.
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