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Posted to issues@hive.apache.org by "Jesus Camacho Rodriguez (JIRA)" <ji...@apache.org> on 2017/02/23 12:05:44 UTC

[jira] [Work started] (HIVE-16023) Wrong estimation for number of rows generated by IN expression

     [ https://issues.apache.org/jira/browse/HIVE-16023?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HIVE-16023 started by Jesus Camacho Rodriguez.
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> Wrong estimation for number of rows generated by IN expression
> --------------------------------------------------------------
>
>                 Key: HIVE-16023
>                 URL: https://issues.apache.org/jira/browse/HIVE-16023
>             Project: Hive
>          Issue Type: Bug
>          Components: Statistics
>    Affects Versions: 2.2.0
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>
> Code seems to be wrong, as we are factoring the number of rows to create the multiplying factor, instead of NDV for given column(s) and NDV in IN clause.



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