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From "Eugene Koifman (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-15839) Don't force cardinality check if only WHEN NOT MATCHED is specified
Date Tue, 07 Feb 2017 19:50:41 GMT
Eugene Koifman created HIVE-15839:
-------------------------------------

             Summary: Don't force cardinality check if only WHEN NOT MATCHED is specified
                 Key: HIVE-15839
                 URL: https://issues.apache.org/jira/browse/HIVE-15839
             Project: Hive
          Issue Type: Sub-task
    Affects Versions: 2.2.0
            Reporter: Eugene Koifman
            Assignee: Eugene Koifman


should've been part of HIVE-14949

if only WHEN NOT MATCHED is specified then the join is basically an anti-join and we are not
retrieving any values from target side. So the cardinality check is just overhead (though
presumably very minor since the filter above the join will filter everything and thus there
is nothing to group)



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