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From "Ruilong Huo (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HAWQ-1717) Incorrect seeding for random function
Date Mon, 13 May 2019 01:02:00 GMT
Ruilong Huo created HAWQ-1717:
---------------------------------

             Summary: Incorrect seeding for random function
                 Key: HAWQ-1717
                 URL: https://issues.apache.org/jira/browse/HAWQ-1717
             Project: Apache HAWQ
          Issue Type: Bug
          Components: Core
            Reporter: Ruilong Huo
            Assignee: Ruilong Huo


```
$ 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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