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https://issues.apache.org/jira/browse/SPARK-32945?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17208464#comment-17208464
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Apache Spark commented on SPARK-32945:
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User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/29950
> Avoid project combination when it will hurst performance
> --------------------------------------------------------
>
> Key: SPARK-32945
> URL: https://issues.apache.org/jira/browse/SPARK-32945
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.1.0
> Reporter: L. C. Hsieh
> Assignee: L. C. Hsieh
> Priority: Major
>
> In some cases, project combination will hurt performance. We should avoid
> project combination for that case.
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