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Posted to issues@spark.apache.org by "Takeshi Yamamuro (Jira)" <ji...@apache.org> on 2021/04/08 02:05:00 UTC
[jira] [Updated] (SPARK-34922) Use better CBO cost function
[ https://issues.apache.org/jira/browse/SPARK-34922?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Takeshi Yamamuro updated SPARK-34922:
-------------------------------------
Fix Version/s: 3.0.3
3.1.2
> 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, 3.1.2, 3.0.3
>
>
> 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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