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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:
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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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