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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-7796) Provide subquery pushdown facility for storage handlers
Date Thu, 20 Nov 2014 02:01:34 GMT

    [ https://issues.apache.org/jira/browse/HIVE-7796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14218887#comment-14218887
] 

Ashutosh Chauhan commented on HIVE-7796:
----------------------------------------

It will be better to formalize this. Patch in current form seems to be exposing too much internal
of Hive (like TS operator etc.) 
 Would it be possible for you to share an implementation of this interface so that its easier
to understand how this interface is used?

> Provide subquery pushdown facility for storage handlers
> -------------------------------------------------------
>
>                 Key: HIVE-7796
>                 URL: https://issues.apache.org/jira/browse/HIVE-7796
>             Project: Hive
>          Issue Type: Improvement
>          Components: StorageHandler
>            Reporter: Navis
>            Assignee: Navis
>            Priority: Minor
>         Attachments: HIVE-7796.1.patch.txt
>
>
> If underlying storage can handle basic filtering or aggregation, hive can delegate execution
of whole subquery to the storage and handle it as a simple scanning operation.
> Experimentally implemented on JDBC / Phoenix handler and seemed working good. Hopefully
open the code for those too, but it's not allowed to me yet.



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