[I] [Feature] least and greatest function enhanced [doris]

[via GitHub]

vkingnew opened a new issue, #40275:
URL: https://github.com/apache/doris/issues/40275

   ### Search before asking
   
   - [X] I had searched in the 
[issues](https://github.com/apache/doris/issues?q=is%3Aissue) and found no 
similar issues.
   
   
   ### Description
   
   function least and greateast default operation nulls value ，whether operate 
nulls value should up
   to user .
   -- current
   `select least(1,2,3,NULL) little,greatest(1,2,3,null) big;`
   
![image](https://github.com/user-attachments/assets/d98e8c92-cee5-4cdd-842d-1401e599020e)
   
   
   -- expect：
   
![image](https://github.com/user-attachments/assets/ee67f3af-b31d-4dd1-9289-54c3cd372116)
   -- desired feature：
   `least(col1,col2 [ignore|respect] nulls)`
   `greatest(col1,col2 [ignore|respect] nulls)`
   
   -- statement example
   `select least(1,2,3,null ignore nulls) little,greatest(1,2,3,null,IGNORE 
nulls ) big;`
   `select least(1,2,3,null,respect ignore nulls) 
little,greatest(1,2,3,null,respect nulls ) big;`
   
   ### Use case
   
   _No response_
   
   ### Related issues
   
   _No response_
   
   ### Are you willing to submit PR?
   
   - [ ] 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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