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https://issues.apache.org/jira/browse/SPARK-42504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17691354#comment-17691354
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Apache Spark commented on SPARK-42504:
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User 'ulysses-you' has created a pull request for this issue:
https://github.com/apache/spark/pull/40098

> NestedColumnAliasing support pruning adjacent projects
> ------------------------------------------------------
>
>                 Key: SPARK-42504
>                 URL: https://issues.apache.org/jira/browse/SPARK-42504
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.5.0
>            Reporter: XiDuo You
>            Priority: Major
>
> CollapseProject won't combine adjacent projects into one, e.g. non-cheap 
> expression has been accessed more than once with the below project. Then 
> there would be possible to appear some adjacent project nodes that 
> NestedColumnAliasing does not support pruning.



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