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Posted to issues-all@impala.apache.org by "Csaba Ringhofer (Jira)" <ji...@apache.org> on 2022/05/20 13:03:00 UTC
[jira] [Work started] (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 ]
Work on IMPALA-11301 started by Csaba Ringhofer.
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> 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
> 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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