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https://issues.apache.org/jira/browse/SPARK-6367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14370220#comment-14370220
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Apache Spark commented on SPARK-6367:
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User 'yhuai' has created a pull request for this issue:
https://github.com/apache/spark/pull/5094
> Use the proper data type for those expressions that are hijacking existing
> data types.
> --------------------------------------------------------------------------------------
>
> Key: SPARK-6367
> URL: https://issues.apache.org/jira/browse/SPARK-6367
> Project: Spark
> Issue Type: Task
> Components: SQL
> Reporter: Yin Huai
> Assignee: Yin Huai
>
> For the following expressions, the actual value type does not match the type
> of our internal representation.
> ApproxCountDistinctPartition
> NewSet
> AddItemToSet
> CombineSets
> CollectHashSet
> We should create UDTs for data types of these expressions.
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