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Posted to issues@hawq.apache.org by "Ruilong Huo (JIRA)" <ji...@apache.org> on 2019/05/13 01:02:00 UTC
[jira] [Created] (HAWQ-1717) Incorrect seeding for random function
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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