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https://issues.apache.org/jira/browse/HIVE-13993?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15324998#comment-15324998
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Sergey Shelukhin commented on HIVE-13993:
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Then we also need fold, and we can have map-reduce on top of Hive ;)
> Hive should provide built-in UDF that can apply another UDF to each element
> of an array
> ---------------------------------------------------------------------------------------
>
> Key: HIVE-13993
> URL: https://issues.apache.org/jira/browse/HIVE-13993
> Project: Hive
> Issue Type: New Feature
> Reporter: Anthony Hsu
>
> There is currently no simple way to take an array field and apply a UDF on
> each element of the array, returning a new array. This is a basic use case
> that Hive should provide a built-in UDF for. More motivation:
> http://stackoverflow.com/questions/27722493/how-to-invoke-udf-for-each-element-in-an-array-in-hive
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