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From "Xiao Li (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SPARK-12594) Outer Join Elimination by Filter Condition
Date Mon, 04 Jan 2016 02:37:39 GMT

     [ https://issues.apache.org/jira/browse/SPARK-12594?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Xiao Li updated SPARK-12594:
----------------------------
    Description: 
Elimination of outer joins, if the predicates in the filter condition can restrict the result
sets so that all null-supplying rows are eliminated. 

- full outer -> inner if both sides have such predicates
- left outer -> inner if the right side has such predicates
- right outer -> inner if the left side has such predicates
- full outer -> left outer if only the left side has such predicates
- full outer -> right outer if only the right side has such predicates

If applicable, this can greatly improve the performance. 

  was:
Elimination of outer joins, if the local predicates can restrict the result sets so that all
null-supplying rows are eliminated. 

- full outer -> inner if both sides have such local predicates
- left outer -> inner if the right side has such local predicates
- right outer -> inner if the left side has such local predicates
- full outer -> left outer if only the left side has such local predicates
- full outer -> right outer if only the right side has such local predicates

If applicable, this can greatly improve the performance. 


> Outer Join Elimination by Filter Condition
> ------------------------------------------
>
>                 Key: SPARK-12594
>                 URL: https://issues.apache.org/jira/browse/SPARK-12594
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 1.6.0
>            Reporter: Xiao Li
>            Priority: Critical
>
> Elimination of outer joins, if the predicates in the filter condition can restrict the
result sets so that all null-supplying rows are eliminated. 
> - full outer -> inner if both sides have such predicates
> - left outer -> inner if the right side has such predicates
> - right outer -> inner if the left side has such predicates
> - full outer -> left outer if only the left side has such predicates
> - full outer -> right outer if only the right side has such predicates
> If applicable, this can greatly improve the performance. 



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