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From "Xiao Li (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SPARK-12594) Join Conversion: Outer to Inner/Left/Right, Right to Inner and Left to Inner
Date Fri, 01 Jan 2016 00:13:39 GMT
Xiao Li created SPARK-12594:
-------------------------------

             Summary: Join Conversion: Outer to Inner/Left/Right, Right to Inner and Left
to Inner
                 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


Conversion 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. 



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