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https://issues.apache.org/jira/browse/SPARK-52767?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan reassigned SPARK-52767:
-----------------------------------
Assignee: Mingliang Zhu
> Hidden performance issues with join and union
> ---------------------------------------------
>
> Key: SPARK-52767
> URL: https://issues.apache.org/jira/browse/SPARK-52767
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 4.0.0
> Reporter: Mingliang Zhu
> Assignee: Mingliang Zhu
> Priority: Major
> Labels: pull-request-available
>
> The maxRows of join needs to calculate the maxRows of left and right twice
> respectively, the number of maxRows executions of join increases
> exponentially with the number of joins, poor performance when there are many
> joins.
> So we need make the maxRows of left and right in join only calculated once.
>
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