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https://issues.apache.org/jira/browse/SPARK-9372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14990531#comment-14990531
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Apache Spark commented on SPARK-9372:
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User 'vidma' has created a pull request for this issue:
https://github.com/apache/spark/pull/9451
> 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
> Assignee: Yin Huai
>
> 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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