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https://issues.apache.org/jira/browse/SPARK-13838?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15192016#comment-15192016
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Apache Spark commented on SPARK-13838:
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User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/11674
> Clear variable code to prevent it to be re-evaluated in BoundAttribute
> ----------------------------------------------------------------------
>
> Key: SPARK-13838
> URL: https://issues.apache.org/jira/browse/SPARK-13838
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Liang-Chi Hsieh
> Priority: Minor
>
> We should also clear the variable code in BoundReference.genCode to prevent
> it to be evaluated twice, as we did in evaluateVariables.
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