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https://issues.apache.org/jira/browse/SPARK-13135?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15127804#comment-15127804
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Apache Spark commented on SPARK-13135:
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User 'rxin' has created a pull request for this issue:
https://github.com/apache/spark/pull/11019

> Don't print expressions recursively in generated code
> -----------------------------------------------------
>
>                 Key: SPARK-13135
>                 URL: https://issues.apache.org/jira/browse/SPARK-13135
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Reynold Xin
>            Assignee: Reynold Xin
>
> Our code generation currently prints expressions recursively. For example, 
> for expression "(1 + 1) + 1)", we would print the following:
> "(1 + 1) + 1)"
> "(1 + 1)"
> "1"
> "1"
> We should just print the project list once.



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