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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 Mon, 05 Jun 2017 18:10:04 GMT

    [ https://issues.apache.org/jira/browse/HIVE-11297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16037305#comment-16037305
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Chao Sun commented on HIVE-11297:
---------------------------------

[~kellyzly]: it seems the same TableScan [could be added multiple times|https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/parse/spark/SplitOpTreeForDPP.java#L116]
in {{SplitOpTreeForDPP}}, and so multiple MapWorks are generated for the same TableScan. Can
you check if we can avoid doing that? 

> 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
>
>
> 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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