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  1. Apache HAWQ
  2. HAWQ-1717

Incorrect seeding for random function

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 2.4.0.0
    • Fix Version/s: 2.5.0.0
    • Component/s: Core
    • Labels:
      None

      Description

      $ cat src/port/rand.c
      /*
       * $PostgreSQL: pgsql/src/port/rand.c,v 1.6 2009/06/11 14:49:15 momjian Exp $
       *
       *-------------------------------------------------------------------------
       *
       * rand.c
       *	  Missing rand implementations for Win32
       *
       *-------------------------------------------------------------------------
       */
      ...
      
      void
      srand48(long seed)
      {
      	_rand48_seed[0] = RAND48_SEED_0;
      	_rand48_seed[1] = (unsigned short) seed;
      	_rand48_seed[2] = (unsigned short) (seed > 16);
      	_rand48_mult[0] = RAND48_MULT_0;
      	_rand48_mult[1] = RAND48_MULT_1;
      	_rand48_mult[2] = RAND48_MULT_2;
      	_rand48_add = RAND48_ADD;
      }
      ```
      

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              • Assignee:
                huor Ruilong Huo
                Reporter:
                huor Ruilong Huo
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                Dates

                • Created:
                  Updated:
                  Resolved: