Janko Richter ([EMAIL PROTECTED]) reports a bug with a severity of 3
The lower the number the more severe it is.

Short Description
factorial function

Long Description
1. The factorial function returns 0 when the argument is 0. The factorial Funtion is 
defined as:  factorial(0)=1

2. It would be better to define a factorial function returning double precision. The 
factorial function returning bigint produces false values  with arguments larger then 
20.

Notice: I'm using the factorial function for statistical functions (for example 
poisson distribution)

Thank you.


Sample Code
test=# select factorial(0);
 factorial 
-----------
         0
(1 row)

janko=# select factorial(21::bigint);
      factorial       
----------------------
 -4249290049419214848
(1 row)




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