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From "Chao Sun (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-11297) Combine op trees for partition info generating tasks [Spark branch]
Date Sat, 17 Jun 2017 05:47:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-11297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16052701#comment-16052701
] 

Chao Sun commented on HIVE-11297:
---------------------------------

[~kellyzly] I think in the original code the parent node of all branches is a filter op, but
now it is changed. That's why I think it's better to rename it to something else to avoid
confusion. And yes, the selOp is no longer needed.

> Combine op trees for partition info generating tasks [Spark branch]
> -------------------------------------------------------------------
>
>                 Key: HIVE-11297
>                 URL: https://issues.apache.org/jira/browse/HIVE-11297
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: spark-branch
>            Reporter: Chao Sun
>            Assignee: liyunzhang_intel
>         Attachments: HIVE-11297.1.patch, HIVE-11297.2.patch, HIVE-11297.3.patch, HIVE-11297.4.patch,
HIVE-11297.5.patch
>
>
> Currently, for dynamic partition pruning in Spark, if a small table generates partition
info for more than one partition columns, multiple operator trees are created, which all start
from the same table scan op, but have different spark partition pruning sinks.
> As an optimization, we can combine these op trees and so don't have to do table scan
multiple times.



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