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https://issues.apache.org/jira/browse/SPARK-4366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14728451#comment-14728451
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Yin Huai commented on SPARK-4366:
---------------------------------
I think we need to first remove the old aggregation code path before starting
to add new native aggregate functions.
HiveUDAF support for AggregateFunction2 (SPARK-9239), Supporting multiple
DISTINCT columns (SPARK-9241), and MutableProjection should evaluate all
expressions first and then update the mutable row (SPARK-10429) are three tasks
that need to be done before we can remove the old code path.
> Aggregation Improvement
> -----------------------
>
> Key: SPARK-4366
> URL: https://issues.apache.org/jira/browse/SPARK-4366
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Cheng Hao
> Priority: Critical
> Attachments: aggregatefunction_v1.pdf
>
>
> This improvement actually includes couple of sub tasks.
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