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Posted to issues@impala.apache.org by "Joe McDonnell (Jira)" <ji...@apache.org> on 2025/06/20 15:38:00 UTC

[jira] [Resolved] (IMPALA-13901) Make "histogram","sample", and "group_concat" ineligible for tuple caching

     [ https://issues.apache.org/jira/browse/IMPALA-13901?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Joe McDonnell resolved IMPALA-13901.
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    Fix Version/s: Impala 5.0.0
       Resolution: Fixed

> Make "histogram","sample", and "group_concat" ineligible for tuple caching
> --------------------------------------------------------------------------
>
>                 Key: IMPALA-13901
>                 URL: https://issues.apache.org/jira/browse/IMPALA-13901
>             Project: IMPALA
>          Issue Type: Task
>          Components: Frontend
>    Affects Versions: Impala 5.0.0
>            Reporter: Joe McDonnell
>            Assignee: Joe McDonnell
>            Priority: Major
>             Fix For: Impala 5.0.0
>
>
> "histogram" and "sample" use the same infrastructure as "appx_median", which includes randomness. These functions should be marked ineligible for tuple caching. This came up in some test cases when running with tuple cache verification.



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