Ron Hu created SPARK-17080:
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             Summary: 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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