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https://issues.apache.org/jira/browse/HAWQ-1717?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16838217#comment-16838217
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ASF GitHub Bot commented on HAWQ-1717:
--------------------------------------
stanlyxiang commented on issue #1447: HAWQ-1717. Fix incorrect seeding for
random function
URL: https://github.com/apache/hawq/pull/1447#issuecomment-491655123
+1
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> 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
> Priority: Major
>
> {code:c}
> $ 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;
> }
> ```
> {code}
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