[jira] [Commented] (SPARK-13873) Avoid the copy in whole stage codegen when there is no joins

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-13873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15196108#comment-15196108 ] 

Apache Spark commented on SPARK-13873:
--------------------------------------

User 'davies' has created a pull request for this issue:
https://github.com/apache/spark/pull/11740

> Avoid the copy in whole stage codegen when there is no joins
> ------------------------------------------------------------
>
>                 Key: SPARK-13873
>                 URL: https://issues.apache.org/jira/browse/SPARK-13873
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Davies Liu
>            Assignee: Davies Liu
>
> When we generate code for join, we copy the output row, because there could be multiple output row from single input row.
> We could avoid this copy when there is no join, or the join will not generate multiple output rows from single input row.



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