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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12839) Upgrade Hive to Calcite 1.6
Date Sun, 31 Jan 2016 19:45:39 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15125467#comment-15125467
] 

Ashutosh Chauhan commented on HIVE-12839:
-----------------------------------------

With upgrade to 1.6 limit join transpose rule is kicking in. But for Hive it may generate
a worse plan. See, changes in limit_join_transpose.q where because limit was pushed through
join, we end up generating an extra MR job, since to force limit we blindly force all rows
to go through one reducer, thus requiring extra job, which here is unnecessary. We need to
make changes in Hive physical compiler not to force extra MR stage for such case. See related
: HIVE-12963 cc: [~jcamachorodriguez]

> Upgrade Hive to Calcite 1.6
> ---------------------------
>
>                 Key: HIVE-12839
>                 URL: https://issues.apache.org/jira/browse/HIVE-12839
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Pengcheng Xiong
>            Assignee: Pengcheng Xiong
>         Attachments: HIVE-12839.01.patch, HIVE-12839.02.patch, HIVE-12839.03.patch
>
>
> CLEAR LIBRARY CACHE
> Upgrade Hive to Calcite 1.6.0-incubating.



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