[jira] [Created] (HIVE-15489) Alternatively use table scan stats for HoS

[Chao Sun (JIRA)]

Chao Sun created HIVE-15489:
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             Summary: Alternatively use table scan stats for HoS
                 Key: HIVE-15489
                 URL: https://issues.apache.org/jira/browse/HIVE-15489
             Project: Hive
          Issue Type: Improvement
          Components: Spark, Statistics
    Affects Versions: 2.2.0
            Reporter: Chao Sun
            Assignee: Chao Sun


For MapJoin in HoS, we should provide an option to only use stats in the TS 
rather than the populated stats in each of the join branch. This could be 
pretty conservative but more reliable.



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