linliu-code opened a new pull request, #14116:
URL: https://github.com/apache/hudi/pull/14116

   ### Describe the issue this Pull Request addresses
   
   When the payload class configured during the write is different from the one 
from table config, the payload class validation fails the write.
   When merge mode is either `event_time` or `commit_time` based, the merge 
behavior is not impacted by the payload class configured. Therefore, we can 
relax the validation constraints to ignore the payload class configuration when 
the merge mode is not custom.
   
   ### Summary and Changelog
   
   When the table version is >= 9, and the merge mode is not custom, we skip 
the payload class validation.
   
   ### Impact
   
   Better user experience.
   
   ### Risk Level
   
   None.
   
   ### Documentation Update
   
   <!-- Describe any necessary documentation update if there is any new 
feature, config, or user-facing change. If not, put "none".
   
   - The config description must be updated if new configs are added or the 
default value of the configs are changed.
   - Any new feature or user-facing change requires updating the Hudi website. 
Please follow the 
     [instruction](https://hudi.apache.org/contribute/developer-setup#website) 
to make changes to the website. -->
   
   ### Contributor's checklist
   
   - [ ] Read through [contributor's 
guide](https://hudi.apache.org/contribute/how-to-contribute)
   - [ ] Enough context is provided in the sections above
   - [ ] Adequate tests were added if applicable
   


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