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From "Jesus Camacho Rodriguez (JIRA)" <j...@apache.org>
Subject [jira] [Work started] (HIVE-21928) Fix for statistics annotation in nested AND expressions
Date Wed, 03 Jul 2019 15:56:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-21928?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Work on HIVE-21928 started by Jesus Camacho Rodriguez.
------------------------------------------------------
> Fix for statistics annotation in nested AND expressions
> -------------------------------------------------------
>
>                 Key: HIVE-21928
>                 URL: https://issues.apache.org/jira/browse/HIVE-21928
>             Project: Hive
>          Issue Type: Bug
>          Components: Physical Optimizer
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>            Priority: Critical
>         Attachments: HIVE-21928.patch
>
>
> Discovered while working on HIVE-21867. Having predicates with nested AND expressions
may result in different stats, even if predicates are basically similar (from stats estimation
standpoint).
> For instance, stats for {{AND(x=5, true, true)}} are different from {{x=5}}.



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