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https://issues.apache.org/jira/browse/SPARK-21304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16073754#comment-16073754
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Apache Spark commented on SPARK-21304:
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User 'cloud-fan' has created a pull request for this issue:
https://github.com/apache/spark/pull/18529
> remove unnecessary isNull variable for collection related encoder expressions
> -----------------------------------------------------------------------------
>
> Key: SPARK-21304
> URL: https://issues.apache.org/jira/browse/SPARK-21304
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Wenchen Fan
> Assignee: Wenchen Fan
>
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