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Posted to dev@hive.apache.org by "Zoltan Haindrich (JIRA)" <ji...@apache.org> on 2018/05/11 11:44:00 UTC

[jira] [Created] (HIVE-19500) Prevent multiple selectivity estimations for the same variable in conjuctions

Zoltan Haindrich created HIVE-19500:
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             Summary: Prevent multiple selectivity estimations for the same variable in conjuctions
                 Key: HIVE-19500
                 URL: https://issues.apache.org/jira/browse/HIVE-19500
             Project: Hive
          Issue Type: Sub-task
            Reporter: Zoltan Haindrich
            Assignee: Zoltan Haindrich


see HIVE-19097 for problem description

for filters like: {{(d_year in (2001,2002) and d_year = 2001)}} the current estimation is around {{(1/NDV)**2}} (iff column stats are available) ....

this patch targets on branch-2



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