Xiao Li created SPARK-12594:
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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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