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From "Apache Spark (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (SPARK-12613) Elimination of Outer Join by Parent Join Condition
Date Mon, 04 Jan 2016 03:38:39 GMT

     [ https://issues.apache.org/jira/browse/SPARK-12613?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Apache Spark reassigned SPARK-12613:
------------------------------------

    Assignee: Apache Spark

> Elimination of Outer Join by Parent Join Condition
> --------------------------------------------------
>
>                 Key: SPARK-12613
>                 URL: https://issues.apache.org/jira/browse/SPARK-12613
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 1.6.0
>            Reporter: Xiao Li
>            Assignee: Apache Spark
>            Priority: Critical
>
> Given an outer join is involved in another join (called parent join), when the join type
of the parent join is inner, left-semi, left-outer and right-outer, checking if the join condition
of the parent join satisfies the following two conditions:
>  1) there exist null filtering predicates against the columns in the null-supplying side
of parent join.
>  2) these columns are from the child join.
>  If having such join predicates, execute the elimination rules:
>  - full outer -> inner if both sides of the child join have such predicates
>  - left outer -> inner if the right side of the child join has such predicates
>  - right outer -> inner if the left side of the child join has such predicates
>  - full outer -> left outer if only the left side of the child join has such predicates
>  - full outer -> right outer if only the right side of the child join has such predicates



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