You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues-all@impala.apache.org by "Csaba Ringhofer (Jira)" <ji...@apache.org> on 2022/05/20 12:47:00 UTC
[jira] [Commented] (IMPALA-11301) Extreme cardinality estimations if NDV=1
[ https://issues.apache.org/jira/browse/IMPALA-11301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17540110#comment-17540110 ]
Csaba Ringhofer commented on IMPALA-11301:
------------------------------------------
https://gerrit.cloudera.org/#/c/18543/
> 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
> 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
--
This message was sent by Atlassian Jira
(v8.20.7#820007)
---------------------------------------------------------------------
To unsubscribe, e-mail: issues-all-unsubscribe@impala.apache.org
For additional commands, e-mail: issues-all-help@impala.apache.org