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  1. Calcite
  2. CALCITE-1414

Add RAND_INTEGER function, which returns a random integer modulo N

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Details

    • Bug
    • Status: Closed
    • Major
    • Resolution: Fixed
    • None
    • 1.11.0
    • None

    Description

      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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              julian.feinauer Julian Feinauer
              julianhyde Julian Hyde
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                Updated:
                Resolved: