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From "Lefty Leverenz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-6348) Order by/Sort by in subquery
Date Sat, 08 Jul 2017 02:37:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-6348?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16078913#comment-16078913
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Lefty Leverenz commented on HIVE-6348:
--------------------------------------

Thank you for the documentation, Rui Li.  I removed the TODOC3.0 label.

Here are the doc links:

* [Configuration Properties -- hive.remove.orderby.in.subquery | https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.remove.orderby.in.subquery]
* [SortBy -- Syntax of Order By | https://cwiki.apache.org/confluence/display/Hive/LanguageManual+SortBy#LanguageManualSortBy-SyntaxofOrderBy]
* [SortBy -- Syntax of Sort By | https://cwiki.apache.org/confluence/display/Hive/LanguageManual+SortBy#LanguageManualSortBy-SyntaxofSortBy]

> Order by/Sort by in subquery
> ----------------------------
>
>                 Key: HIVE-6348
>                 URL: https://issues.apache.org/jira/browse/HIVE-6348
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Gunther Hagleitner
>            Assignee: Rui Li
>            Priority: Minor
>              Labels: sub-query
>             Fix For: 3.0.0
>
>         Attachments: HIVE-6348.1.patch, HIVE-6348.2.patch, HIVE-6348.3.patch, HIVE-6348.4.patch
>
>
> select * from (select * from foo order by c asc) bar order by c desc;
> in hive sorts the data set twice. The optimizer should probably remove any order by/sort
by in the sub query unless you use 'limit '. Could even go so far as barring it at the semantic
level.



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