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Posted to issues@spark.apache.org by "Xiao Li (JIRA)" <ji...@apache.org> on 2016/01/02 05:15:39 UTC

[jira] [Updated] (SPARK-12602) Join Reordering: Pushing Inner Join Through Outer Join

     [ https://issues.apache.org/jira/browse/SPARK-12602?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Xiao Li updated SPARK-12602:
----------------------------
    Description: 
If applicable, we can push Inner Join through Outer Join. This can reduce the number of rows since the Inner Join always can generate less rows than Outer Join. 

This can improve the performance.

  was:If applicable, we can push Inner Join through Outer Join. This can reduce the number of rows since the Inner Join always can generate less rows than Outer Join. 


> Join Reordering: Pushing Inner Join Through Outer Join
> ------------------------------------------------------
>
>                 Key: SPARK-12602
>                 URL: https://issues.apache.org/jira/browse/SPARK-12602
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 1.6.0
>            Reporter: Xiao Li
>            Priority: Critical
>
> If applicable, we can push Inner Join through Outer Join. This can reduce the number of rows since the Inner Join always can generate less rows than Outer Join. 
> This can improve the performance.



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