Mryange opened a new pull request, #39322:
URL: https://github.com/apache/doris/pull/39322

   ## Proposed changes
   
   ```
   mysql [(none)]>select round(timediff(now(),'2024-08-15')/60/60,2);
   ERROR 1105 (HY000): errCode = 2, detailMessage = argument 1 requires 
datetimev2 type, however 'now()' is of datetime type
   ```
   The reason is that the function parameter types were modified in 
expectedInputTypes, which led to no match being found. The code here is from a 
long time ago. Because the precision of datetimev2 could not be deduced in the 
past, a separate implementation was made here. This code can be safely deleted.
   
   
   <!--Describe your changes.-->
   
   


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