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From "Jesus Camacho Rodriguez (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-11171) Join reordering algorithm might introduce projects between joins
Date Tue, 07 Jul 2015 11:57:04 GMT

    [ https://issues.apache.org/jira/browse/HIVE-11171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14616572#comment-14616572
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Jesus Camacho Rodriguez commented on HIVE-11171:
------------------------------------------------

Changes in q files LGTM.
All of them are join input swaps, resulting in removal of Select operator on top of the join.
Further, in some cases multijoin merge is triggered where it was not triggered before e.g.
join_merging.q.

> Join reordering algorithm might introduce projects between joins
> ----------------------------------------------------------------
>
>                 Key: HIVE-11171
>                 URL: https://issues.apache.org/jira/browse/HIVE-11171
>             Project: Hive
>          Issue Type: Bug
>          Components: CBO
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>         Attachments: HIVE-11171.01.patch, HIVE-11171.02.patch, HIVE-11171.03.patch, HIVE-11171.5.patch,
HIVE-11171.patch, HIVE-11171.patch
>
>
> Join reordering algorithm might introduce projects between joins which causes multijoin
optimization in SemanticAnalyzer to not kick in.



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