Takuya Ueshin created SPARK-2509:
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             Summary: Add optimization for Substring.
                 Key: SPARK-2509
                 URL: https://issues.apache.org/jira/browse/SPARK-2509
             Project: Spark
          Issue Type: Improvement
          Components: SQL
            Reporter: Takuya Ueshin


{{Substring}} including {{null}} literal cases could be added to 
{{NullPropagation}}.



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