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Posted to issues@impala.apache.org by "Jinchul Kim (JIRA)" <ji...@apache.org> on 2017/11/07 09:06:00 UTC

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

Jinchul Kim created IMPALA-6168:
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             Summary: 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, Docs
    Affects Versions: Impala 2.10.0
            Reporter: Jinchul Kim
            Priority: Minor


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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