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https://issues.apache.org/jira/browse/CALCITE-1414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15751039#comment-15751039
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Julian Feinauer commented on CALCITE-1414:
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I added a pull request: https://github.com/apache/calcite/pull/338 with my
suggestion how to implement this function.
> Add a RANDOM function
> ---------------------
>
> Key: CALCITE-1414
> URL: https://issues.apache.org/jira/browse/CALCITE-1414
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Julian Hyde
> Labels: newbie
>
> Add a RANDOM function.
> It is not standard SQL, but most DBMSs have one, and it be useful.
> It will also allow us to better test non-deterministic expressions.
> I propose that:
> * {{RANDOM(n)}} returns an integer between 0 and n - 1 inclusive.
> * There is no facility to specify a seed at this time.
> * The random number generator is randomly seeded at query start time based on
> (say) the method used by Java's {{new Random()}}; if you run the query twice,
> you will (probably) not get the same results.
> * If you call the function twice in the same row, it will (probably) return
> different results.
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