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https://issues.apache.org/jira/browse/SPARK-14338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15222553#comment-15222553
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Apache Spark commented on SPARK-14338:
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User 'dongjoon-hyun' has created a pull request for this issue:
https://github.com/apache/spark/pull/12122
> Improve `SimplifyConditionals` rule to handle `null` in IF/CASEWHEN
> -------------------------------------------------------------------
>
> Key: SPARK-14338
> URL: https://issues.apache.org/jira/browse/SPARK-14338
> Project: Spark
> Issue Type: Improvement
> Components: Optimizer, SQL
> Reporter: Dongjoon Hyun
>
> Currently, `SimplifyConditionals` handles `true` and `false` to optimize
> branches. This issue improves `SimplifyConditionals` to take advantage of
> `null` conditions for `if` and `CaseWhen` expressions, too.
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