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From "Navis (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-3562) Some limit can be pushed down to map stage
Date Wed, 10 Oct 2012 05:13:05 GMT
Navis created HIVE-3562:
---------------------------

             Summary: Some limit can be pushed down to map stage
                 Key: HIVE-3562
                 URL: https://issues.apache.org/jira/browse/HIVE-3562
             Project: Hive
          Issue Type: Bug
            Reporter: Navis
            Assignee: Navis
            Priority: Trivial


Queries with limit clause (with reasonable number), for example
{noformat}
select * from src order by key limit 10;
{noformat}

makes operator tree, 
TS-SEL-RS-EXT-LIMIT-FS

But LIMIT can be partially calculated in RS, reducing size of shuffling.
TS-SEL-RS(TOP-N)-EXT-LIMIT-FS


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