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https://issues.apache.org/jira/browse/SPARK-9150?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14632311#comment-14632311
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Apache Spark commented on SPARK-9150:
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User 'rxin' has created a pull request for this issue:
https://github.com/apache/spark/pull/7487
> Create a trait to track code generation for expressions
> -------------------------------------------------------
>
> Key: SPARK-9150
> URL: https://issues.apache.org/jira/browse/SPARK-9150
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
> Assignee: Reynold Xin
> Priority: Critical
>
> It is very hard to track which expression supports code generation or not.
> This patch removes the default gencode implementation from Expression, and
> moves the default fallback implementation into a new trait called
> CodegenFallback. Each concrete expression needs to either implement code
> generation, or mix in CodegenFallback.
> This makes it very easy to track which expressions have code generation
> implemented already.
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