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https://issues.apache.org/jira/browse/SPARK-2504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14063028#comment-14063028
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Takuya Ueshin commented on SPARK-2504:
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PRed: https://github.com/apache/spark/pull/1426
> 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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