auto convert map join should not be triggered if the input size is bigger than 
a configured value.
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                 Key: HIVE-2095
                 URL: https://issues.apache.org/jira/browse/HIVE-2095
             Project: Hive
          Issue Type: Bug
            Reporter: He Yongqiang
            Assignee: He Yongqiang


If auto convert join is set to true, it should fall back to common join if the 
input size of each join table is bigger than a configured value.

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