zclllyybb opened a new issue, #44932:
URL: https://github.com/apache/doris/issues/44932

   ### 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
   
   We need to implement function `NEXT_DAY` and `PREVIOUS_DAY`, for the next 
day/previous day of input argument(which accept `datev2` or `datetimev2` type)
   and for `LAST_DAY ` we support the second argument(optinal, if not provided, 
act like got `month` so that the old behaviours won't be change) to get the 
last day of current week/month/day/quarter... and so on
   
   ### Solution
   
   To support a function, we need:
   
   function implementation and registration in BE
   function signature and visitor for nereids planner in FE
   the constant fold implementation in FE, behave just same with it in BE, like 
`functions/executable/NumericArithmetic.java` in  
https://github.com/apache/doris/pull/40744/files
   another function docs pr in https://github.com/apache/doris-website
   you can reference pr like https://github.com/apache/doris/pull/33005/files
   
   and ATTN! we must have enough testcases, like what 
https://github.com/apache/doris/pull/40462/files did.
   
   ### 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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