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https://issues.apache.org/jira/browse/SPARK-14359?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15224476#comment-15224476
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Eric Liang commented on SPARK-14359:
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Sure
> Improve user experience for typed aggregate functions in Java
> -------------------------------------------------------------
>
> Key: SPARK-14359
> URL: https://issues.apache.org/jira/browse/SPARK-14359
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
>
> See the Scala version in SPARK-14285. The main problem we'd need to work
> around is that Java cannot return primitive types in generics, and as a
> result we would have to return boxed types.
> One requirement is that we should add tests for both Java 7 style (in
> sql/core) and Java 8 style lambdas (in external/java-8...).
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