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https://issues.apache.org/jira/browse/SPARK-34922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17316050#comment-17316050
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Apache Spark commented on SPARK-34922:
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User 'tanelk' has created a pull request for this issue:
https://github.com/apache/spark/pull/32076
> Use better CBO cost function
> ----------------------------
>
> Key: SPARK-34922
> URL: https://issues.apache.org/jira/browse/SPARK-34922
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.2.0
> Reporter: Tanel Kiis
> Assignee: Tanel Kiis
> Priority: Major
> Fix For: 3.2.0
>
>
> In SPARK-33935 we changed the CBO cost function such that it would be
> symetric - A.betterThan(B) implies that !B.betterThan(A). Before both could
> have been true.
> That change introduced a performance regression in some queries.
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