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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 20:28:39 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15125482#comment-15125482
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Ashutosh Chauhan commented on HIVE-12839:
-----------------------------------------

[~pxiong] Can you take a look why rule got triggered. It seems like test is written for a
case when it shouldn't be triggered.

However, [~jcamachorodriguez] in cases when it does get triggered, we can generate a better
plan of not adding an extra MR step to enforce limit. For query in test, pushing limits in
previous reduce stage will be sufficient, since we don't need exact limit to be enforced at
that stage. Depending on data, this extra job actually may slow down the job. It seems like
there is a possibility of improvement here.  

> 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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