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

["Yin Huai (JIRA)" <ji...@apache.org>]

Yin Huai created SPARK-9372:
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             Summary: 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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