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| author | Bruce Momjian <bruce@momjian.us> | 2006-02-03 12:45:47 +0000 |
|---|---|---|
| committer | Bruce Momjian <bruce@momjian.us> | 2006-02-03 12:45:47 +0000 |
| commit | 59bb147353ba274e0836d06f429176d4be47452c (patch) | |
| tree | e864abc962077de3d01834dec6bdacbf3934e298 /src/backend/commands | |
| parent | eb7bd06983bcbd4c178bba0e78214e8fb76ae8c3 (diff) | |
| download | postgresql-59bb147353ba274e0836d06f429176d4be47452c.tar.gz postgresql-59bb147353ba274e0836d06f429176d4be47452c.zip | |
Update random() usage so ranges are inclusive/exclusive as required.
Diffstat (limited to 'src/backend/commands')
| -rw-r--r-- | src/backend/commands/analyze.c | 13 |
1 files changed, 3 insertions, 10 deletions
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); } /* |