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https://issues.apache.org/jira/browse/SPARK-55471?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-55471.
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Fix Version/s: 4.2.0
Resolution: Fixed
Issue resolved by pull request 54236
[https://github.com/apache/spark/pull/54236]
> Adding optimizer support for Sequential Union
> ---------------------------------------------
>
> Key: SPARK-55471
> URL: https://issues.apache.org/jira/browse/SPARK-55471
> Project: Spark
> Issue Type: Task
> Components: Optimizer, Structured Streaming
> Affects Versions: 4.2.0
> Reporter: Eric Marnadi
> Assignee: Eric Marnadi
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.2.0
>
>
> We want to allow for nested sequential unions to be flattened and for
> projections to be pushed down to the Sequential Union children.
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