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https://issues.apache.org/jira/browse/SPARK-12813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15097319#comment-15097319
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Apache Spark commented on SPARK-12813:
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User 'marmbrus' has created a pull request for this issue:
https://github.com/apache/spark/pull/10747
> Eliminate serialization for back to back operations
> ---------------------------------------------------
>
> Key: SPARK-12813
> URL: https://issues.apache.org/jira/browse/SPARK-12813
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 1.6.0
> Reporter: Michael Armbrust
> Assignee: Michael Armbrust
> Priority: Critical
>
> Right now we serialize the object back to a row, even if the next operator is
> expecting the same object.
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