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Posted to dev@hive.apache.org by "Jason Dere (JIRA)" <ji...@apache.org> on 2015/07/15 00:01:04 UTC

[jira] [Created] (HIVE-11262) Skip MapJoin processing if the join hash table is empty

Jason Dere created HIVE-11262:
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             Summary: Skip MapJoin processing if the join hash table is empty
                 Key: HIVE-11262
                 URL: https://issues.apache.org/jira/browse/HIVE-11262
             Project: Hive
          Issue Type: Improvement
          Components: Query Processor
            Reporter: Jason Dere
            Assignee: Jason Dere


Currently the map join processor processes all rows of the big table, even when the hash table is empty. If it is an inner join, we should be able to skip the join processing, since the result should be empty.



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