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Posted to issues@impala.apache.org by "Adam Tamas (Jira)" <ji...@apache.org> on 2020/03/30 14:15:00 UTC

[jira] [Resolved] (IMPALA-6168) Different result range of rand/random built-in function

     [ https://issues.apache.org/jira/browse/IMPALA-6168?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Adam Tamas resolved IMPALA-6168.
--------------------------------
    Resolution: Duplicate

The rand() method's interval after the IMPALA-5754 change is already [0,1).

> Different result range of rand/random built-in function
> -------------------------------------------------------
>
>                 Key: IMPALA-6168
>                 URL: https://issues.apache.org/jira/browse/IMPALA-6168
>             Project: IMPALA
>          Issue Type: Bug
>          Components: Backend
>    Affects Versions: Impala 2.10.0
>            Reporter: Jin Chul Kim
>            Assignee: Adam Tamas
>            Priority: Minor
>              Labels: correctness, newbie
>
> I am not sure this is a bug because it might be intended behavior. Please close this if it is not a bug.
> When I was re-implementing rand at IMPALA-5754,  I realized some DBMSes(e.g. Postgres, MySQL and Vertica) adopt the following range: "0 <= result < 1". By the way, Impala's range of the current implementation is "0 <= result <= 1" and document also says "Returns a random value between 0 and 1".
> Would you let me know why the difference comes from? Please explain if it is intended behavior.



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