[GitHub] [doris] TaoZex opened a new issue, #12524: [Feature] The factorial function support like hive.

[GitBox]

TaoZex opened a new issue, #12524:
URL: https://github.com/apache/doris/issues/12524

   ### Search before asking
   
   - [X] I had searched in the 
[issues](https://github.com/apache/incubator-doris/issues?q=is%3Aissue) and 
found no similar issues.
   
   
   ### Description
   
   Finding the factorial of a number is a common problem，we need factorial 
function support.
   
   ### Use case
   
   <img width="149" alt="fac" 
src="https://user-images.githubusercontent.com/45089228/189494958-841ad6b0-ddbf-4270-b073-697adfbe1168.png";>
   This function returns n factorial. The valid n is [0..20].Returns null if n 
is out of [0..20] range.
   
   ### Related issues
   
   _No response_
   
   ### Are you willing to submit PR?
   
   - [X] Yes I am willing to submit a PR!
   
   ### Code of Conduct
   
   - [X] I agree to follow this project's [Code of 
Conduct](https://www.apache.org/foundation/policies/conduct)
   


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