OSDir

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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


Zoltan Haindrich created HIVE-19500:
---------------------------------------

             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



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)