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https://issues.apache.org/jira/browse/SPARK-9401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14706384#comment-14706384
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Apache Spark commented on SPARK-9401:
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User 'yjshen' has created a pull request for this issue:
https://github.com/apache/spark/pull/8353
> Fully implement code generation for ConcatWs
> --------------------------------------------
>
> Key: SPARK-9401
> URL: https://issues.apache.org/jira/browse/SPARK-9401
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
>
> In ConcatWs, we fall back to interpreted mode if the input is a mix of string
> and array of strings. We should have code gen for those as well.
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