[jira] [Created] (SPARK-2504) Fix nullability of Substring expression.

[Takuya Ueshin (JIRA)]

Takuya Ueshin created SPARK-2504:
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             Summary: Fix nullability of Substring expression.
                 Key: SPARK-2504
                 URL: https://issues.apache.org/jira/browse/SPARK-2504
             Project: Spark
          Issue Type: Bug
          Components: SQL
            Reporter: Takuya Ueshin


This is a follow-up of [#1359|https://github.com/apache/spark/pull/1359] with 
nullability narrowing.



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