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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2016/01/07 06:51:40 UTC

[jira] [Commented] (SPARK-12686) Support group-by push down into data sources

    [ https://issues.apache.org/jira/browse/SPARK-12686?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15086860#comment-15086860 ] 

Apache Spark commented on SPARK-12686:
--------------------------------------

User 'maropu' has created a pull request for this issue:
https://github.com/apache/spark/pull/10631

> 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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