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https://issues.apache.org/jira/browse/SPARK-8220?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14587692#comment-14587692
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Apache Spark commented on SPARK-8220:
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User 'zhichao-li' has created a pull request for this issue:
https://github.com/apache/spark/pull/6838
> math function: positive
> -----------------------
>
> Key: SPARK-8220
> URL: https://issues.apache.org/jira/browse/SPARK-8220
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
> Assignee: zhichao-li
>
> positive(INT a): INT
> positive(DOUBLE a): DOUBLE
> This is really just an identify function. We should create an Identity
> expression, and then in the optimizer just removes the Identity functions.
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