ORDER BY with GROUP ignored without LIMIT
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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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