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https://issues.apache.org/jira/browse/TRAFODION-3042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16452585#comment-16452585
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ASF GitHub Bot commented on TRAFODION-3042:
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Github user asfgit closed the pull request at:
https://github.com/apache/trafodion/pull/1539
> RAND() function is not always random
> ------------------------------------
>
> Key: TRAFODION-3042
> URL: https://issues.apache.org/jira/browse/TRAFODION-3042
> Project: Apache Trafodion
> Issue Type: Bug
> Components: sql-exe
> Affects Versions: 2.2.0
> Reporter: Hans Zeller
> Assignee: Hans Zeller
> Priority: Major
>
> When trying the RAND() function, I found that it does not always behave as I
> would expect. I tried this example:
> {noformat}
> >>select rand(), rand(), rand() from dual;
> (EXPR) (EXPR) (EXPR)
> ---------- ---------- ----------
> 78242471 78511383 78612225
> --- 1 row(s) selected.
> >>select rand(), rand(), rand() from dual;
> (EXPR) (EXPR) (EXPR)
> ---------- ---------- ----------
> 1589208276 1589460381 1589561223
> --- 1 row(s) selected.
> >>select rand(), rand(), rand() from dual;
> (EXPR) (EXPR) (EXPR)
> ---------- ---------- ----------
> 134371215 134724162 134858618
> --- 1 row(s) selected.
> >>
> {noformat}
> So, it seems that if we call rand() within a very short time, the value will
> be non-random.
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