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https://issues.apache.org/jira/browse/SPARK-22856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16299536#comment-16299536
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Apache Spark commented on SPARK-22856:
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User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/20043
> Add wrapper for codegen output and nullability
> ----------------------------------------------
>
> Key: SPARK-22856
> URL: https://issues.apache.org/jira/browse/SPARK-22856
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.2.1
> Reporter: Liang-Chi Hsieh
>
> The codegen output of {{Expression}}, {{ExprCode}}, now encapsulates only
> strings of output value {{value}} and nullability ({{isNull}}). It makes
> difficulty for us to know what the output really is. I think it is better if
> we can add wrappers for the value and nullability that let us to easily know
> that.
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