[jira] Reopened: (HIVE-647) SORT BY with GROUP ignored without LIMIT

["Namit Jain (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-647?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Namit Jain reopened HIVE-647:
-----------------------------


> SORT BY with GROUP ignored without LIMIT
> ----------------------------------------
>
>                 Key: HIVE-647
>                 URL: https://issues.apache.org/jira/browse/HIVE-647
>             Project: Hadoop Hive
>          Issue Type: Bug
>          Components: Query Processor
>            Reporter: Bill Graham
>
> For queries with GROUP BY and SORT BY, the sort is not handled properly when a LIMIT is not supplied. If I run the following two queries, the first returns properly sorted results. The second does not.
> SELECT user, SUM(numRequests) AS num FROM MyTable GROUP BY user SORT BY num DESC LIMIT 50;
> SELECT user, SUM(numRequests) AS num FROM MyTable GROUP BY user SORT BY num DESC;
> Explain is different for the two queries as well. The first uses 3 M/R jobs and the second only uses 2, which might be part of the problem.

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