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https://issues.apache.org/jira/browse/SPARK-9132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14634371#comment-14634371
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Apache Spark commented on SPARK-9132:
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User 'tarekauel' has created a pull request for this issue:
https://github.com/apache/spark/pull/7552
> Implement code gen for Conv
> ---------------------------
>
> Key: SPARK-9132
> URL: https://issues.apache.org/jira/browse/SPARK-9132
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
>
> Would be great to refactor the thing slightly so we can do code generation.
> Since conv actually have some internal buffer, I think the best way is to
> create a new NumberConverter class that contains the internal buffer, and
> move most of the methods there. And then in Conv expression, we just create a
> NumberConverter, and call it to do the conversion.
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