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