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Posted to issues@spark.apache.org by "Dongjoon Hyun (JIRA)" <ji...@apache.org> on 2019/06/09 20:51:00 UTC

[jira] [Updated] (SPARK-27714) Support Join Reorder based on Genetic Algorithm when the # of joined tables > 12

     [ https://issues.apache.org/jira/browse/SPARK-27714?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dongjoon Hyun updated SPARK-27714:
----------------------------------
    Affects Version/s:     (was: 2.4.3)
                       3.0.0

> Support Join Reorder based on Genetic Algorithm when the # of joined tables > 12
> --------------------------------------------------------------------------------
>
>                 Key: SPARK-27714
>                 URL: https://issues.apache.org/jira/browse/SPARK-27714
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.0.0
>            Reporter: Xianyin Xin
>            Priority: Major
>
> Now the join reorder logic is based on dynamic planning which can find the most optimized plan theoretically, but the searching cost grows rapidly with the # of joined tables grows. It would be better to introduce Genetic algorithm (GA) to overcome this problem.



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