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https://issues.apache.org/jira/browse/SPARK-4366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14639403#comment-14639403
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Yin Huai commented on SPARK-4366:
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It will be probably still in 1.5 (right now, we still have a few cases that
need to fallback to the old path. For example, when you have multiple distinct
columns). But, by default, we will use the new code path. In 1.6, the old path
will be remove.
> 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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