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https://issues.apache.org/jira/browse/SPARK-13759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15186307#comment-15186307
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Apache Spark commented on SPARK-13759:
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User 'sameeragarwal' has created a pull request for this issue:
https://github.com/apache/spark/pull/11594
> Add IsNotNull constraints for expressions with an inequality
> ------------------------------------------------------------
>
> Key: SPARK-13759
> URL: https://issues.apache.org/jira/browse/SPARK-13759
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Sameer Agarwal
> Priority: Minor
>
> Support for adding `IsNotNull` constraints from expressions with an
> inequality. More specifically, if an operator has a condition on `a !== b`,
> we know that both `a` and `b` in the operator output can no longer be null.
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