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Posted to issues@impala.apache.org by "Csaba Ringhofer (Jira)" <ji...@apache.org> on 2022/05/20 15:08:00 UTC

[jira] [Resolved] (IMPALA-11301) Extreme cardinality estimations if NDV=1

     [ https://issues.apache.org/jira/browse/IMPALA-11301?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Csaba Ringhofer resolved IMPALA-11301.
--------------------------------------
    Resolution: Fixed

> Extreme cardinality estimations if NDV=1
> ----------------------------------------
>
>                 Key: IMPALA-11301
>                 URL: https://issues.apache.org/jira/browse/IMPALA-11301
>             Project: IMPALA
>          Issue Type: Bug
>          Components: Frontend
>    Affects Versions: Impala 4.0.0
>            Reporter: Csaba Ringhofer
>            Assignee: Csaba Ringhofer
>            Priority: Major
>
> if ndv of string_col == 1, then string_col != "something const"  will have a selectivity of 0, leading to a cardinality of 1 regardless of number of rows
> This issue was introduced in IMPALA-10677



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