Janko Richter (j.richter@wallstreet-develop.de) 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
bigintproduces 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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