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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2019/06/27 12:00:09 UTC
[jira] [Assigned] (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 ]
Apache Spark reassigned SPARK-27714:
------------------------------------
Assignee: (was: Apache Spark)
> 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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