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https://issues.apache.org/jira/browse/SPARK-17080?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15892325#comment-15892325
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Apache Spark commented on SPARK-17080:
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User 'wzhfy' has created a pull request for this issue:
https://github.com/apache/spark/pull/17138
> join reorder
> ------------
>
> Key: SPARK-17080
> URL: https://issues.apache.org/jira/browse/SPARK-17080
> Project: Spark
> Issue Type: Sub-task
> Components: Optimizer
> Affects Versions: 2.0.0
> Reporter: Ron Hu
>
> We decide the join order of a multi-way join query based on the cost function
> defined in the spec.
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