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https://issues.apache.org/jira/browse/SPARK-4143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14189380#comment-14189380
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Apache Spark commented on SPARK-4143:
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User 'chenghao-intel' has created a pull request for this issue:
https://github.com/apache/spark/pull/3007
> Move inner class DeferredObjectAdapter to top level
> ---------------------------------------------------
>
> Key: SPARK-4143
> URL: https://issues.apache.org/jira/browse/SPARK-4143
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Cheng Hao
> Priority: Trivial
>
> The class DeferredObjectAdapter is the inner class of HiveGenericUdf, which
> may cause some overhead in closure ser/de-ser. Move it to top level.
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