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https://issues.apache.org/jira/browse/SPARK-20494?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-20494.
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Resolution: Won't Fix
> Implement UDF array_unique in Spark with codegen
> ------------------------------------------------
>
> Key: SPARK-20494
> URL: https://issues.apache.org/jira/browse/SPARK-20494
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Affects Versions: 2.1.0
> Reporter: jane
> Priority: Trivial
>
> It is nice to have a generic UDF that could return an array with all
> duplicate elements removed, e.g., for [1, 2, 2, 3, 4, 3, 6], it could return
> [1,2,3,4,6]
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