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