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Update random() usage so ranges are inclusive/exclusive as required.

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This commit is contained in:
Bruce Momjian
2006-02-03 12:45:47 +00:00
parent eb7bd06983
commit 59bb147353
4 changed files with 10 additions and 17 deletions
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13
src/backend/commands/analyze.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/analyze.c,v 1.90 2005/11/22 18:17:08 momjian Exp $
* $PostgreSQL: pgsql/src/backend/commands/analyze.c,v 1.91 2006/02/03 12:45:47 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -927,18 +927,11 @@ acquire_sample_rows(Relation onerel, HeapTuple *rows, int targrows,
return numrows;
}
/* Select a random value R uniformly distributed in 0 < R < 1 */
/* Select a random value R uniformly distributed in (0 - 1) */
static double
random_fract(void)
{
long z;
/* random() can produce endpoint values, try again if so */
do
{
z = random();
} while (z <= 0 || z >= MAX_RANDOM_VALUE);
return (double) z / (double) MAX_RANDOM_VALUE;
return ((double) random() + 1) / ((double) MAX_RANDOM_VALUE + 2);
}
/*