Mapjoin will fail if there are no files associating with the join tables
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                 Key: HIVE-1804
                 URL: https://issues.apache.org/jira/browse/HIVE-1804
             Project: Hive
          Issue Type: Bug
          Components: Query Processor
    Affects Versions: 0.7.0
            Reporter: Liyin Tang
            Assignee: Liyin Tang
             Fix For: 0.7.0


If there are some empty tables without any file associated, the map join will 
fail.

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