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https://issues.apache.org/jira/browse/SPARK-12795?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen updated SPARK-12795:
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Component/s: SQL
> Whole stage codegen
> -------------------
>
> Key: SPARK-12795
> URL: https://issues.apache.org/jira/browse/SPARK-12795
> Project: Spark
> Issue Type: Epic
> Components: SQL
> Reporter: Davies Liu
> Assignee: Davies Liu
>
> Whole stage codegen is used by some modern MPP databases to archive great
> performance. See http://www.vldb.org/pvldb/vol4/p539-neumann.pdf
> For Spark SQL, we can compile multiple operator into a single Java function
> to avoid the overhead from materialize rows and Scala iterator.
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