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https://issues.apache.org/jira/browse/SPARK-7549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14625704#comment-14625704
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Chen Song commented on SPARK-7549:
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I prefer the former. I thought about using explode, it's a good way to
implement the nested aggregations. But I wanna take advantage of codegen by
implement these directly.
> Support aggregating over nested fields
> --------------------------------------
>
> Key: SPARK-7549
> URL: https://issues.apache.org/jira/browse/SPARK-7549
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
>
> Would be nice to be able to run sum, avg, min, max (and other numeric
> aggregate expressions) on arrays.
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