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https://issues.apache.org/jira/browse/SPARK-9422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14645168#comment-14645168
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Apache Spark commented on SPARK-9422:
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User 'yhuai' has created a pull request for this issue:
https://github.com/apache/spark/pull/7737
> Remove the placeholder attributes used in the aggregation buffers
> -----------------------------------------------------------------
>
> Key: SPARK-9422
> URL: https://issues.apache.org/jira/browse/SPARK-9422
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Yin Huai
> Assignee: Yin Huai
>
> Originally, to merge two aggregation buffers, we create a mutable buffer with
> extra placeholder attributes to represent grouping expressions (because the
> input aggregation buffer has grouping keys). This was done to make the first
> implementation easy. We can remove it now, which can also help us to
> implement the hash aggregate operator using unsafe row as the buffer.
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