From 59bb147353ba274e0836d06f429176d4be47452c Mon Sep 17 00:00:00 2001
From: Bruce Momjian <bruce@momjian.us>
Date: Fri, 3 Feb 2006 12:45:47 +0000
Subject: Update random() usage so ranges are inclusive/exclusive as required.

---
 src/backend/commands/analyze.c | 13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

(limited to 'src/backend/commands')

diff --git a/src/backend/commands/analyze.c b/src/backend/commands/analyze.c
index 095ffe783fe..06bbe5d3243 100644
--- a/src/backend/commands/analyze.c
+++ b/src/backend/commands/analyze.c
@@ -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);
 }
 
 /*
-- 
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