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From "Xuefu Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-15489) Alternatively use table scan stats for HoS
Date Wed, 15 Feb 2017 04:48:42 GMT

    [ https://issues.apache.org/jira/browse/HIVE-15489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15867249#comment-15867249
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Xuefu Zhang commented on HIVE-15489:
------------------------------------

+1, Patch looks good. One minor suggestion: it would be great if we can add some map-join
test cases with the introduced configuration to true to server as a sanity check. Otherwise,
the new code path will not be exercised in ptest.

> Alternatively use table scan stats for HoS
> ------------------------------------------
>
>                 Key: HIVE-15489
>                 URL: https://issues.apache.org/jira/browse/HIVE-15489
>             Project: Hive
>          Issue Type: Improvement
>          Components: Spark, Statistics
>    Affects Versions: 2.2.0
>            Reporter: Chao Sun
>            Assignee: Chao Sun
>         Attachments: HIVE-15489.1.patch, HIVE-15489.2.patch, HIVE-15489.3.patch, HIVE-15489.6.patch,
HIVE-15489.wip.patch
>
>
> For MapJoin in HoS, we should provide an option to only use stats in the TS rather than
the populated stats in each of the join branch. This could be pretty conservative but more
reliable.



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