function from adhoc compatibility to GrUDF
Input INTEGER integer Output DOUBLE factorial (the product of all natural numbers from 1 to parameter 1)
TestSQL SELECT 6.000 AS ISCORRECT, F_FACT(3) FROM RDB$DATABASE; SELECT 6.000 AS ISCORRECT, F_FACTORIAL(3) FROM RDB$DATABASE; SELECT NULL AS ISCORRECT, F_FACT(NULL) FROM RDB$DATABASE;