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Posted to issues@hive.apache.org by "Jesus Camacho Rodriguez (JIRA)" <ji...@apache.org> on 2018/05/23 16:48:00 UTC
[jira] [Reopened] (HIVE-19500) Prevent multiple selectivity
estimations for the same variable in conjuctions
[ https://issues.apache.org/jira/browse/HIVE-19500?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jesus Camacho Rodriguez reopened HIVE-19500:
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> 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
> Affects Versions: 3.0.0, 3.1.0
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
> Fix For: 4.0.0
>
> Attachments: HIVE-19500.01.patch, HIVE-19500.02.patch, HIVE-19500.03.patch
>
>
> 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) ....
> actually the source of the problem was a small typo in HIVE-17465
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