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Posted to issues@spark.apache.org by "Hyukjin Kwon (JIRA)" <ji...@apache.org> on 2019/05/21 04:35:50 UTC

[jira] [Resolved] (SPARK-9372) For a join operator, rows with null equal join key expression can be filtered out early

     [ https://issues.apache.org/jira/browse/SPARK-9372?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hyukjin Kwon resolved SPARK-9372.
---------------------------------
    Resolution: Incomplete

> For a join operator, rows with null equal join key expression can be filtered out early
> ---------------------------------------------------------------------------------------
>
>                 Key: SPARK-9372
>                 URL: https://issues.apache.org/jira/browse/SPARK-9372
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Yin Huai
>            Priority: Major
>              Labels: bulk-closed
>
> Taking {{select ... from A join B on (A.key = B.key)}} as an example, we can filter out rows that have null values for column A.key/B.key because those rows do not contribute to the result of the output.



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