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https://issues.apache.org/jira/browse/SPARK-12686?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15088343#comment-15088343
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Yan commented on SPARK-12686:
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Spark-12449 seems to be a super set of this Jira.
> Support group-by push down into data sources
> --------------------------------------------
>
> Key: SPARK-12686
> URL: https://issues.apache.org/jira/browse/SPARK-12686
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 1.6.0
> Reporter: Takeshi Yamamuro
>
> As for logical plan nodes like 'Aggregate -> Project -> (Filter) -> Scan', we
> can push down partial aggregation processing into data sources that could
> aggregate their own data efficiently because Orc/Parquet could fetch the
> MIN/MAX value by using statistics data and some databases have efficient
> aggregation implementations.
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