[jira] [Created] (SPARK-2518) Fix foldability of Substring expression.

[Takuya Ueshin (JIRA)]

Takuya Ueshin created SPARK-2518:
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             Summary: Fix foldability of Substring expression.
                 Key: SPARK-2518
                 URL: https://issues.apache.org/jira/browse/SPARK-2518
             Project: Spark
          Issue Type: Bug
          Components: SQL
            Reporter: Takuya Ueshin


This is a follow-up of [#1428|https://github.com/apache/spark/pull/1428].



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