[PR] [branch-2.0](function) fix date_format and from_unixtime core when meet long format string (#35883) [doris]

[via GitHub]

zclllyybb opened a new pull request, #37178:
URL: https://github.com/apache/doris/pull/37178

   ## Proposed changes
   
   pick https://github.com/apache/doris/pull/35883
   
   before:
   crash
   
   now:
   ```sql
   mysql> SELECT  DATE_FORMAT('2011-06-24', '%f %V %f %l %V %I %S %p %w %r %j 
%f %l %I %D %w %j %D %e %s %V %f %D %M %s %X %U %v %c %u %x %r %j %a %h %s %m 
%a %v %u %b');
   
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | date_format(cast('2011-06-24' as DATETIMEV2(0)), '%f %V %f %l %V %I %S %p 
%w %r %j %f %l %I %D %w %j %D %e %s %V %f %D %M %s %X %U %v %c %u %x %r %j %a 
%h %s %m %a %v %u %b') |
   
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | NULL                                                                       
                                                                                
                    |
   
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   1 row in set (0.80 sec)
   ```
   
   


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